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High performance actuator motor

Patent Number: 8446121
Publication Date: 2013-05-21
Inventors: ; ; ; ;

An actuator motor described herein has fast dynamic response capability, high torque density, high efficiency, and improved thermal and mechanical stability at high speed while minimizing weight. According to one aspect of the disclosure provided herein, an actuator motor has a rotor shaft with an array of permanent magnets attached according to a Halbach array configuration. A stator includes windings that induce a torque on the rotor shaft when rotating magnetic fields interact with the ...

Electronic switching module for a power tool

Patent Number: 8446120
Publication Date: 2013-05-21
Inventors: ; ;

A power tool includes a tool housing, an electric motor inside the housing, and a power interface facilitating a connection to a power source. At least four actively-controlled power components are configured as an H-bridge to modulate a supply of power from the power interface to the electric motor. A user-actuated input unit outputs a first signal indicative of a desired power output level to the electric motor and a second signal indicative of a desired direction of current flow to the ...

Controlling an electric motor by dynamic switching

Patent Number: 8446119
Publication Date: 2013-05-21
Inventors: ;

An apparatus for controlling an electric motor is provided. A plurality of switches is provided for controlling a direction of current through motor coils of the electric motor. A brushless motor control circuit is connected to each of the plurality of switches. Responsive to a request to adjust one of an angular velocity and an angular acceleration of the electric motor, the plurality of switches are activated to place the motor coils in a predetermined configuration to maximize torque or ...

Rotary electric machine control device

Patent Number: 8446118
Publication Date: 2013-05-21
Inventors: ; ;

A rotary electric machine control device includes a positive/negative determination section that determines whether an output torque of the rotary electric machine is positive or negative; a correction parameter setting section that sets as a correction parameter a phase difference of a sinusoidal ripple correction wave for reducing torque ripple of the rotary electric machine with respect to a magnetic pole position of the rotary electric machine depending on whether the output torque is ...

Methods, systems and apparatus for adjusting duty cycle of pulse width modulated (PWM) waveforms

Patent Number: 8446117
Publication Date: 2013-05-21
Inventors: ; ; ;

Embodiments of the present invention relate to methods, systems and apparatus for controlling operation of a multi-phase machine in a vector controlled motor drive system when the multi-phase machine operates in an overmodulation region. The disclosed embodiments provide a mechanism for adjusting a duty cycle of PWM waveforms so that the correct phase voltage command signals are applied at the angle transitions. This can reduce variations/errors in the phase voltage command signals applied ...

Discharge control device for power conversion system

Patent Number: 8446116
Publication Date: 2013-05-21
Inventors: ;

The discharge control device for a power conversion system performs discharge control to discharge a capacitor parallel-connected to the input side of the power conversion system including a plurality of pairs of high-side and low-side switching elements connected in series and each controlled by a drive unit, by turning on the high-side and low-side switching elements of one of the pairs at the same time. At this time, the discharge control device inhibits an ON command from being inputted ...

Motor drive device

Patent Number: 8446115
Publication Date: 2013-05-21
Inventors: ;

A motor drive device has a drive circuit for driving a motor, and a control section for controlling the drive circuit. The control section has a current command value calculating portion for calculating a current command value, a rotation calculating portion for calculating a rotation angle and an angular speed of the motor, a current command value correcting portion for correcting the current command value based on the rotation angle, a voltage command value calculating portion for ...

Control apparatus for electric rotating machine

Patent Number: 8446114
Publication Date: 2013-05-21
Inventors: ; ; ;

A control apparatus for use with an electric power conversion system which is equipped with a dc/ac converter connected to an electric rotating machine and a capacitor joined to input terminals of the dc/ac converter. The control apparatus stores an angle of rotation (i.e., start angle θ0) of the electric rotating machine before start of control of energization of the electric rotating machine to discharge the capacitor and determines command currents idr and iqr which will result ...

Vehicular electrical system and method for controlling an inverter during motor deceleration

Patent Number: 8446113
Publication Date: 2013-05-21
Inventors: ; ; ;

Methods and systems for operating an inverter having a plurality of high switches and a plurality of low switches coupled to an electric motor are provided. An event indicative of deceleration of the electric motor is detected. The inverter is alternated between a first mode of operation and a second mode of operation during the deceleration of the electric motor. In the first mode of operation, each of the plurality of high switches is activated and each of the plurality of low switches is ...

Magnetically powered reciprocating engine and electromagnet control system

Patent Number: 8446112
Publication Date: 2013-05-21
Inventor:

The instant invention provides a magnetically controlled reciprocating engine having a unique electromagnet control system. The engine is constructed and arranged to operate from a stored power source such as batteries to provide extended run times by controlling the power supplied to the electromagnets in a manner that controls heat generation within the electromagnetic coils, thereby increasing coil life. The control system is also capable of controlling engine speed and/or torque outputs ...

Motor for electric power steering device with integrated controller and electric power steering device

Patent Number: 8446111
Publication Date: 2013-05-21
Inventor:

A motor for an electric power steering device with an integrated controller (1) includes a motor (2) and a controller (15) which controls driving of the motor (2) and has a metal case, the motor and the controller being formed integrally with each other. The motor (1) is attached to a speed reduction mechanism (23). The motor (2), the controller (15), and the speed reduction mechanism (23) are arranged in this order, in an axial ...

Direct-current to three-phase alternating-current inverter system

Patent Number: 8441225
Publication Date: 2013-05-14
Inventor:

A DC to three-phase AC inverter system includes a three-phase motor, an inverter circuit, switching elements, a capacitor, a DC power source and a control circuit. The DC power source is connected to the three-phase motor at a neutral point thereof. The control circuit calculates voltage commands, first through third divided boost commands by dividing a boost command, and first through third drive signals based on the voltage commands and the first through third divided boost commands. The ...

Driving apparatus for a vehicle-mounted electric motor

Patent Number: 8441224
Publication Date: 2013-05-14
Inventors: ; ;

An inverter circuit for a motor outputs three-phase AC currents, which are outputted from common connection points to stator coils, based on output voltage of a DC power source and a power supply capacitor by a switching operation of transistors. An inverter control circuit determines that a system main relay is turned off, upon receiving a main relay-off signal from an electronic control unit. The inverter control circuit turns on the low-side transistors, while turning off the high-side ...

Torque control method for high-speed switched reluctance motor

Patent Number: 8441223
Publication Date: 2013-05-14
Inventor:

Disclosed herein is a torque control method for a high-speed Switched Reluctance Motor (SRM), which controls a torque in the high-speed operation of a 2-phase SRM. In the torque control method for a high-speed SRM, a positive torque (T*_mA) of an active phase (A phase) of the two phases of the SRM is compensated for based on a negative torque attributable to an inactive phase (B phase) of two phases during a compensation control enable interval (EN_A) ranging from a time ...

System and method for determining pump pressure based on motor current

Patent Number: 8441222
Publication Date: 2013-05-14
Inventors: ; ;

A system for measuring current in an H-Bridge motor drive circuit and using that current to determine the output of a device powered by the motor. A particular embodiment is disclosed for a motor-driven fluid pump. Motor current is measured at predetermined pump pressures and flow rates to create calibration tables relating motor current to pump pressure. Once calibrated, the system determines pump pressure based on motor current by referring to the calibration tables. In an embodiment, the ...

Windshield wiper control system

Patent Number: 8441221
Publication Date: 2013-05-14
Inventor:

The present invention relates to a low-cost windshield wiper control system which can be readily incorporated into existing vehicle systems, particularly into an operator-accessible windshield wiper control unit assembly (100). The windshield wiper control assembly (100) is selectively operable as an intermittent wiper control system, or as a rain sensing windshield wiper control system without the need for microprocessors or multiplex ...

Electrical regenerative braking

Patent Number: 8441218
Publication Date: 2013-05-14
Inventor:

This invention relates to an electrical regenerative brake (100) with a rotating brake coil (10) which is mounted on a wheel (14) of a vehicle, whereby a magnetic field (18) is fed in the coil (10). In order to allow effective regenerative braking (100) at low speeds and to provide a significant increase in power saving, this invention proposes that the permanent magnet (13) producing the magnetic field (18) is placed in the inner ...

Oscillator circuit with frequency sweep function

Patent Number: 8441217
Publication Date: 2013-05-14
Inventor:

With an oscillator circuit with a frequency sweep function, a first counter counts a reference clock for a number of counts that corresponds to a digital first setting signal, and generates a first count completion signal which is asserted on completion of the count. A D/A converter converts a digital second setting signal into an analog control voltage. A VCO oscillates with a frequency according to the control voltage. When the first count completion signal is asserted, the VCO is reset. ...

Power conversion device

Patent Number: 8436573
Publication Date: 2013-05-07
Inventors: ;

A power conversion device includes a first inverter circuit and a second inverter circuit, a capacitor, and a microcomputer. The microcomputer switches a control operation, according to the steering state of a steering wheel, between a first state where a first duty center value is shifted to be lower than an output center value and a second duty center value is shifted to be higher than the output center value, and a second state where the first duty center value is shifted to be higher ...

Switched reluctance machine

Patent Number: 8436572
Publication Date: 2013-05-07
Inventor:

A reluctance machine includes a stator and a rotor having a same number of poles. The rotor is configured to rotate about an axis of rotation. Each stator pole is formed of a primary stator pole and an auxiliary stator pole. The auxiliary stator pole is axially aligned with the primary stator pole in the direction of the axis of rotation. Each rotor pole has a length extending in the direction of the axis of rotation sufficient to at least partially cover the primary stator pole and axially ...

Actuator system including an active material

Patent Number: 8436571
Publication Date: 2013-05-07
Inventors: ; ; ; ; ;

A linear actuator associated with an actuator system for a device includes a wire cable fabricated from an active material. The linear actuator couples to the device and to the moveable element. The active material induces strain in the linear actuator in response to an activation signal. The linear actuator translates the moveable element relative to the device in response to the induced strain. An activation controller electrically connects to the linear actuator and generates the ...

Motor driving system, motor controller, and safety function expander

Patent Number: 8436570
Publication Date: 2013-05-07
Inventor:

The motor driving system includes a driving state amount detector configured to detect a driving state amount, a motor control part configured to perform a power supply control, a higher control part capable of outputting a higher control command to the motor control part, and a safety requesting part that inputs a safety request signal to the motor control part. The motor control part includes a motor control circuit part that performs the power supply control, a mode selecting and ...

Alternating current machine with increased torque above and below rated speed for hybrid/electric propulsion systems

Patent Number: 8436569
Publication Date: 2013-05-07
Inventor:

The machine in accordance with the present disclosure is an AC machine whose pole numbers can be switched (from pole p₁to pole p₂), and whose number of series turns per phase N can be switched say from N₀=N_ratedto N₁=N₀/2. Furthermore, it employs an inverter so that the frequency can be changed from a low value (e.g., 5 Hz) to a high value (e.g., 200 Hz). Due to the combination of pole number and number of series turns ...

Motor drive apparatus and electric power steering system using the same

Patent Number: 8436568
Publication Date: 2013-05-07
Inventors: ;

A motor drive apparatus includes a control circuit, which determines that a wire connecting a battery to a first power supply relay and a second power supply relay is broken, and not failure of the power supply relays, if power is not supplied to a motor from the power supply relays when the power supply relays are controlled to turn on. The location of failure can thus be specified accurately. It is only necessary in this case to replace the wire. The motor drive apparatus need not be ...

Fan speed control circuit

Patent Number: 8436567
Publication Date: 2013-05-07
Inventor:

A fan speed control circuit for controlling the rotation speed of a fan motor unit. The speed control circuit includes a resistor, a voltage stabilizing unit, a transistor and a thermal resistor. The resistor is connected to a power source of the fan motor unit, the voltage stabilizing unit is connected between the resistor and ground. The collector of the transistor is connected to the fan motor unit, the base is connected to a node between the resistor and the voltage stabilizing unit. ...

Multi-speed control apparatus for fan motor

Patent Number: 8436566
Publication Date: 2013-05-07
Inventor:

Disclosed is a multi-speed control apparatus for a fan motor. The apparatus includes a driving member, a motor speed sensing member, a resistor circuit, a voltage-division resistor, and a multi-segment switch. The driving member has a controlled end connected with the multi-segment switch. The driving member has an output end connected with the fan motor. The driving member has a detection end connected with the motor speed sensing member. The resistor circuit includes some resistors with ...

Motor controller for tandem control

Patent Number: 8436565
Publication Date: 2013-05-07
Inventor:

In position tandem control in which one movable member is driven by two motors, an output of the integral element of the velocity control unit in the control system for one motor is copied to the integral element of the velocity control unit in the control system for the other motor. A preload is added to a torque command output from each of the velocity control units in the motor control systems for two motors so that torques in mutually opposite directions are generated to suppress ...

Natural commutation for three phase brushless direct current (BLDC) motors

Patent Number: 8436564
Publication Date: 2013-05-07
Inventors: ;

A control method for a sensor-less, brushless, three-phase DC motor. A pulse-width modulation (PWM) duty cycle may be calculated. A voltage induced by rotation of a rotor may be sampled at a first expected zero crossing value to produce a first sampled voltage value. An average of a plurality of sampled voltage values, including voltage values sampled at a plurality of prior expected zero crossing values and the first sampled voltage value, may be calculated. The first sampled voltage value ...

Control unit and control method for permanent magnet synchronous motor

Patent Number: 8436563
Publication Date: 2013-05-07
Inventors: ; ;

If magnitude relations between the output terminal voltage based on a DC negative terminal of the inverter and a threshold voltage that is a fixed value are compared, polarity thereof is changed at a predetermined rotor phase. The magnitude relation, for example, is detected by an inexpensive and simple apparatus such as a level shift circuit and a NOT circuit. The rotor phase of the permanent magnet synchronous motor is inferred on the basis of changes in the magnitude relation and if it ...

Method and device for monitoring the startup of an electric drive

Patent Number: 8436561
Publication Date: 2013-05-07
Inventor:

A method and a device for monitoring the startup of an electric drive, which has a polyphase machine, a pulse-controlled inverter and a control unit. The control unit is provided to compare rotational speed values that are successive in time to one another during the startup of the drive, and when recognizing a non-increase in the rotational speed of the rotor shaft, to detect a mixup of phase lines or pulse-controlled inverter ...

System and method for actuating a dispensing device using a linear motor

Patent Number: 8436560
Publication Date: 2013-05-07
Inventors: ;

A system for actuating a dispensing device includes an apparatus for holding and actuating the dispensing device that includes a linear motor including a stator component and a forcer component and a frame that orients components of the linear motor relative to each other and relative to the dispensing device. The system further includes a controller configured to control the linear motor and a device that interfaces with the controller and provides a user interface for control of the ...

System and method for motor drive control pad and drive terminals

Patent Number: 8436559
Publication Date: 2013-05-07
Inventors: ; ; ; ; ; ;

Embodiments of the invention provide a variable frequency drive system and a method of controlling a pump driven by a motor with the pump in fluid communication with a fluid system. The drive system and method can provide one or more of the following: a sleep mode, pipe break detection, a line fill mode, an automatic start mode, dry run protection, an electromagnetic interference filter compatible with a ground fault circuit interrupter, two-wire and three-wire and three-phase motor ...

Mooring winch and a method for controlling a cable of a mooring winch

Patent Number: 8436558
Publication Date: 2013-05-07
Inventors: ;

An electrically driven mooring winch is provided. The mooring winch includes a winding drum, an AC motor configured to drive the winding drum, a frequency conversion unit connected to the AC motor, and a control unit configured to control the frequency conversion unit on the basis of an indicator for tension of the mooring rope. The control unit is configured to set a reference value of rotational speed of the AC motor to a predetermined value, drive the AC motor in one direction for a ...

Method and electric circuit for operating an electric motor, especially a servomotor, for a component of an internal combustion engine

Patent Number: 8432123
Publication Date: 2013-04-30
Inventor:

A method is described for operating an electric motor. The electric motor has at least two phases and a rotor. In the method, a current angular position (phipos) of the rotor is ascertained and, as a function of that, in at least one of the two phases, a potential is applied in such a way that a desired angular position (phiposreq) is achieved. From the current angular position (phipos) and the desired angular position (phiposreq) a setpoint angular velocity (dphides) is ascertained, which ...

Method and device for starting single-phase asynchronous motors

Patent Number: 8432122
Publication Date: 2013-04-30
Inventors: ;

A method and device for starting single-phase asynchronous motors which substantially consists in disengaging the start winding of a single-phase asynchronous motor, after its starting, by using a switching means that is connected in series to the start winding. The switching means is controlled as a function of a starting time and of a starting ...

Method and apparatus for control of electrical machines

Patent Number: 8432121
Publication Date: 2013-04-30
Inventors: ;

A method for finding an operating point of an electric motor which includes the steps of generating a perturbation signal, combining the perturbation signal with a current magnitude related to a drive system of the motor or combining the perturbation signal with a power magnitude related to the motor, yielding a combined signal, and sending, based on the combined signal, a flux adjustment signal to adjust a flux of the motor. An apparatus for finding an operating point of an electric motor ...

Tool path display apparatus with deceleration factor identification means for machine tool

Patent Number: 8432120
Publication Date: 2013-04-30
Inventor:

A numerical controller calculates a first position command from a machining program, converts the first position command into a second position command for restricting a tangential speed of a tool, and delivers the second position command and a status signal indicative of the achievement of the conversion of the first position command into the second position command to a tool path display apparatus. The tool path display apparatus displays the path of the tool in a color corresponding to ...

Method and apparatus for characterizing and enhancing the functional performance of machine tools

Patent Number: 8432119
Publication Date: 2013-04-30
Inventors: ; ; ; ; ; ; ;

Disclosed are various systems and methods for assessing and improving the capability of a machine tool. The disclosure applies to machine tools having at least one slide configured to move along a motion axis. Various patterns of dynamic excitation commands are employed to drive the one or more slides, typically involving repetitive short distance displacements. A quantification of a measurable merit of machine tool response to the one or more patterns of dynamic excitation commands is ...

Inverter and a method for controlling an electric machine

Patent Number: 8432118
Publication Date: 2013-04-30
Inventor:

An inverter comprises output switches for generating motor phase currents for application to an electrical motor based on a commanded torque. A current sensor is arranged for detecting motor phase currents applied to the electrical motor by an inverter. A voltage sensor is configured for measuring voltages applied to the electrical motor by the inverter. An output port is capable of outputting output signals of the detected motor phase currents and measured voltages for processing by a ...

Automated shade control system

Patent Number: 8432117
Publication Date: 2013-04-30
Inventors: ; ; ;

Automated shade systems comprise motorized window coverings, sensors, and controllers that use algorithms to control operation of the automated shade control system. These algorithms may include information such as: 3-D models of a building and surrounding structures, shadow information, reflectance information, lighting and radiation information, ASHRAE clear sky algorithms, log information related to manual overrides, occupant preference information, motion information, real-time sky ...

Torque motor driving device for wire cut electrical discharge machines

Patent Number: 8432116
Publication Date: 2013-04-30
Inventor:

In a torque motor driving device for wire cut electrical discharge machines, a voltage waveform rectified by a full-wave rectifying circuit, not using a high-capacitance electrolytic capacitor, is applied as an AC voltage to a single-phase torque motor by a bridge circuit including semiconductor switches. A PWM signal whose duty is adjusted so that the current flowing through the torque motor matches an instructed value is generated and the generated PWM signal is used for the operation of ...

High-speed electric system

Patent Number: 8432114
Publication Date: 2013-04-30
Inventor:

An electric system that includes a single-phase permanent-magnet electric machine and a control system for driving the electric machine under load at speeds in excess of 60 krpm. Additionally, a product that includes the electric ...

Brushless fan motor control circuit assembly

Patent Number: 8432113
Publication Date: 2013-04-30
Inventor:

A brushless fan motor control circuit assembly consists of a high-frequency filter circuit, a rectifier circuit, a power factor enhancing circuit, a current-limit and voltage regulation circuit and a brushless fan motor driving circuit. By means of the high-frequency filter circuit to suppress high frequency noises, the power factor enhancing circuit to enhance the power factor and to save power consumption, the current-limit and voltage regulation circuit to limit the current and to ...

Sensorless lost/found rotor detection for permanent magnet motors

Patent Number: 8432112
Publication Date: 2013-04-30
Inventors: ; ;

Various methods of detecting a found rotor, a lost rotor, a locked rotor and a caught rotor after a power disruption using flux estimates are disclosed. Also disclosed are permanent magnet motor controllers and assemblies suitable for performing one or more of these ...

Pulse amplitude modulation method for the DC brushless motor

Patent Number: 8432111
Publication Date: 2013-04-30
Inventor:

A method of the Pulse Amplitude Modulation for the Sensorless Brushless motor, which includes a start-up circuit, a phase detect circuit, a phase commutation circuit, a driving circuit, BEMF detection circuit, and frequency detector, utilizes the control signal of the phase commutation circuit to control the driving circuit so as to drive the outer motor coil and detect the control signal for the driving motor driving circuit by a detection circuit. The motor system can be controlled to ...