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Stepping motor control circuit and analog electronic timepiece

Patent Number: 8111033
Publication Date: 2012-02-07
Inventors: Manaka, Saburo; Ogasawara, Kenji; Masaki, Hiroyuki; Sakumoto, Kazumi; Takakura, Akira; Kato, Kazuo; Honmura, Keishi; Hasegawa, Takanori; Yamamoto, Kosuke

The present invention aims to prevent a nonrotation state from being brought about even when a drive allowance is changed by variations in a stepping motor or the like. A pulse down counter circuit outputs pulse down control signal for subjecting main drive pulse to control pulse down when time is counted for a predetermined time period. When a detecting signal exceeding a reference threshold voltage detected by a rotation detecting circuit is detected at a first detection section at start ...

Indicating instrument for vehicle

Patent Number: 8111032
Publication Date: 2012-02-07
Inventor: Nakane, Hideyuki

An indicating instrument for a vehicle includes a step motor including a field winding, a pointer, a stopper device for stopping the pointer, which is rotating in a zero-reset direction, at a stopper position, a detecting device for detecting induced voltage of the field winding at each of detecting points, a control device for performing zero-reset control, whereby a drive signal is controlled to rotate the pointer in the zero-reset direction. In a state of abnormal detection in which the ...

Motor control apparatus and motor control method

Patent Number: 8111030
Publication Date: 2012-02-07
Inventors: Tang, Chung-Hung; Kuo, Po-Tsun; Chiu, Chun-Lung; Tsai, Ming-Shi

A motor control apparatus and a motor control method determine whether the motor is in a back-pressure area so as to provide different rotation-speed control signals. When the fan is in the low duty cycle, a first circuit loop is switched on, so that the fan has more accurate rotation speed. When the fan is in the high duty cycle, a second circuit loop is switched on, so that the rotation speed of fan does not be limited to a constant rotation-speed as the fan enters the back-pressure area. ...

Methods and systems for automatic rotation direction determination of electronically commutated motor

Patent Number: 8111029
Publication Date: 2012-02-07
Inventors: Becerra, Roger C.; Beifus, Brian L.; Solan, Jr., Stephen

A method for determining a direction of rotation for an electronically commutated motor (ECM) is described. The motor is configured to rotate a blower and the method comprises rotating the blower using the ECM and determining if the resulting blower rotation is indicative of the desired direction of rotation for the ...

Integrated fan drive system for cooling tower

Patent Number: 8111028
Publication Date: 2012-02-07
Inventors: Rollins, Patrick; Lucas, George

An integrated fan drive system for a cooling tower comprising a high-torque, low speed permanent magnet motor having a rotatable shaft, a fan comprising a hub that is directly connected to the rotatable shaft and a plurality of fan blades that are attached to the hub, and a variable frequency drive device in electrical signal communication with the permanent magnet motor to control the rotational speed of the permanent magnet motor. The high-torque, permanent magnet motor comprises no more ...

Motor drive device

Patent Number: 8111027
Publication Date: 2012-02-07
Inventor: Nakayama, Hiroshi

The present motor control device detects from the speed of a motor and a current driving the motor that the motor is overloaded, and exerts control to set a target torque based on the detected overload state of the motor to cause the motor to output a maximal torque that the motor can output, intermittently within a preset allowable speed range. If the motor is overloaded, the motor's output torque is not decreased and a drive circuit can also be ...

Electric motor drive apparatus, hybrid vehicle with the same and stop control method of electric power converting device

Patent Number: 8111026
Publication Date: 2012-02-07
Inventor: Kitano, Eiji

An ECU activates a shutdown permission signal and provides it to an AND gate when a shutdown signal is inactive. Thus, when an abnormality sensing device does not sense an abnormality, the ECU always keeps the shutdown permission signal active. The AND gate performs logical AND between a signal provided from the abnormality sensing device and the shutdown permission signal to provide the shutdown signal to inverters. When a limp-home run permission signal becomes active while the shutdown ...

Control system for multiphase rotary machines

Patent Number: 8106622
Publication Date: 2012-01-31
Inventors: Yoshida, Hideji; Aoki, Yasuaki

A control system aims at converting, via a switching circuit, a direct current voltage into an alternating current voltage to be applied to multiphase windings of a multiphase rotary machine to thereby control rotation of the multiphase rotary machine. In the control system, a command voltage determiner determines a command voltage value for an alternating current voltage to be applied to the multiphase windings based on a zero crossing of a line-to-line current and a zero crossing of the ...

Control device for induction motor

Patent Number: 8106621
Publication Date: 2012-01-31
Inventors: Yamamoto, Yoichi; Iura, Hideaki; Ide, Kozo; Sato, Sadayuki

A control device includes a slip calculator that calculates a first slip frequency of an induction motor, a current detector that detects motor current that passes through the induction motor, an adder that calculates a primary frequency by adding a speed command and a second slip frequency that are given, a command voltage generation unit that generates first command voltage from the primary frequency, a voltage error observer unit that estimates a command voltage error from the first ...

Vector control device for alternating-current electric motor

Patent Number: 8106620
Publication Date: 2012-01-31
Inventor: Kitanaka, Hidetoshi

There is provided a vector control device for an alternating-current electric motor having a damping controller which automatically calculates an optimum damping operation amount and does not require any gain setting itself, whereby an adjustment work of a control system can be simplified. The vector control device is equipped with a vector controller 30 for executing vector control on the alternating-current electric motor 6 in accordance with a current command or a torque ...

Position sensorless controller for permanent magnet motor

Patent Number: 8106619
Publication Date: 2012-01-31
Inventors: Tobari, Kazuaki; Aoyagi, Shigehisa

In a calculation for estimating axis error in a permanent magnet motor, a d-axis commanded voltage value is added to the product of three signals, which are a q-axis detected current value or commanded current value, an inductance value, and an estimated speed value, and then the resulting value is divided by the product of a commanded speed value ω_r* and induced voltage constant Ke* or an arctangent calculation is performed in the same way, instead of using a resistance ...

Method and device for calibrating a position sensor placed on a shaft of a permanent magnet synchronous motor

Patent Number: 8106618
Publication Date: 2012-01-31
Inventors: Fabis, Radomir; Heller, Marcus

In a method and apparatus for calibrating a position sensor mounted on the shaft of a permanent magnet synchronous motor, to control the position of a rotor of the permanent magnet synchronous motor relative to a magnetic field produced by a stator of the permanent magnet synchronous motor, a DC test current is supplied to stator windings of the permanent magnet synchronous motor to generate a definite magnetic field. The motor speed caused by the DC test current is adjusted to zero by ...

Motor power-management protection method and circuit

Patent Number: 8106617
Publication Date: 2012-01-31
Inventor: Holley, Steven E.

A power management protection circuit and method provides for a fast, real-time hardware logic control of the power control components of a motor, whereby the over-current condition is an integral of the over-current level and over-current time duration, and provides means for complete turn-off of motor voltage within a few microseconds when a specified energy level has been exceeded or an extended time for the user to take corrective actions if thermal conditions permit. Motor turn-off ...

Mobile reconfigurable robot

Patent Number: 8106616
Publication Date: 2012-01-31
Inventor: Theobald, Daniel

A mobile robot along with a method and system for a mobile robot where the robot is reconfigurable between at least two form ...

Pump jack pump-off control method and pump jack control apparatus

Patent Number: 8106615
Publication Date: 2012-01-31
Inventors: Kawamoto, Koji; Kawano, Tetsuo; Yamamoto, Yoichi; Tsuruta, Tatsumi

It is an object of the invention to provide a pump jack pump-off control method and a pump jack control apparatus in which, even when the speed of a pump jack is reduced due to generation of a pump-off condition, the pump jack is not caused to stop due to the motor overload abnormality or the coagulated crude oil and, even when the pump-off condition is generated, the reduction of the production capacity of the pump jack can be prevented as much as possible. On detecting the pump-off ...

Mirror adjustment mechanism, wing mirror unit and method

Patent Number: 8106614
Publication Date: 2012-01-31
Inventors: Niesing, Willem; Huijzers, Bastiaan

An electric motor circuit for controlling an electric motor of a mirror adjustment mechanism includes a switch-off circuit that is provided with a current sensor for measuring the electrical supply current and, depending thereon, generating a voltage. In an embodiment, a current branch is configured to be rendered conductive in response to the generated voltage; an electronic switch is configured to interrupt the supply current as a result of the current branch being rendered conductive. ...

Switching regulation circuit and dual-winding motor apparatus

Patent Number: 8106611
Publication Date: 2012-01-31
Inventors: Chen, Hsuan-Chuan; Lin, Teng-Tsai

A switching regulation circuit for a dual-winding motor apparatus is provided. The switching regulation circuit comprises a gate-controlled device and a driving circuit. When one of the two windings generates an induced voltage signal greater than a threshold value, the driving circuit generates an output signal for turning on the gate-controlled transistor. Thereby, a parasitic diode of the gate-controlled device will not be turned on and damage the entire ...

Heat dissipation device and fan module thereof

Patent Number: 8106610
Publication Date: 2012-01-31
Inventors: Yeh, Jung-Tai; Chen, Chien-Nan

A heat dissipation device has a main controller and a fan module having a motor coil, a connection interface, a PWM driving circuit and a fan monitor chip. The connection interface has a control pin, an error report pin, a power supply pin and a ground pin. The control pin receiving a control signal. The PWM driving circuit adjusts current magnitude and current direction of the motor coil to drive the fan module. The fan monitor chip is connected to the connection interface and the PWM ...

Drive and evaluation unit

Patent Number: 8106609
Publication Date: 2012-01-31
Inventors: Haussecker, Walter; Froehlich, Peter; Schramm, Francois; Buehler, Dirk; Hertweck, Volker

The invention relates to a drive and evaluation unit for displacing an object to be displaced, particularly for raising and lowering a side window in a motor vehicle. The drive includes a commutator motor with a stator having two diametrically opposed permanent magnets. The magnets have cross-sectional shapes of a respective peripheral contour segment, having a radial inner peripheral contour segment which encompasses an armature over a respective inner peripheral angle. The armature is ...

Electric drive unit

Patent Number: 8102143
Publication Date: 2012-01-24
Inventor: Weigel, Jan

Electric drive units comprising a common active part having a stator and a rotor, which has windings and/or permanent magnets for a drive function and an energy transmission function, enable the rotor winding that is provided for energy transmission to be used to allow position detection at a low additional cost. For this purpose, a power converter in the rotor, which provides the output of electrical energy for the energy transmission function, impresses an alternating voltage into the ...

Double ended inverter system for a vehicle having two energy sources that exhibit different operating characteristics

Patent Number: 8102142
Publication Date: 2012-01-24
Inventors: Perisic, Milun; Smith, Gregory S.; Nagashima, James M.; John, George; Chakrabarti, Sibaprasad; Welchko, Brian A.

A double ended inverter system for an AC electric traction motor of a vehicle is disclosed. The inverter system serves as an interface between two different energy sources having different operating characteristics. The inverter system includes a first energy source having first operating characteristics associated therewith, and a first inverter subsystem coupled to the first energy source and configured to drive the AC electric traction motor. The inverter system also includes a second ...

Inverter device

Patent Number: 8102141
Publication Date: 2012-01-24
Inventors: Nagai, Kazunobu; Shibayama, Takeshi; Maekawa, Sari

An inverter device driving an induction motor including main and auxiliary windings both having different winding specifications includes a three-arm inverter circuit having phase output terminals connected to the main winding, the auxiliary winding and a neutral winding of the induction motor respectively and converting a DC power supply to two-phase substantially sinusoidal PWM voltage, a current detector detecting currents of the respective main and auxiliary windings from a DC power ...

Method and apparatus for estimating induction motor electrical parameters

Patent Number: 8102140
Publication Date: 2012-01-24
Inventors: Gao, Zhi; Colby, Roy S.; Turner, Larry A.

A method and apparatus to provide estimates of electrical parameters for line-connected induction motors during either steady-state or dynamic motor operations. The electrical parameters are calculated from the motor nameplate data and voltage and current measurements. No speed sensors or electronic injection circuits are needed. The method can be divided into 4 major steps. First, complex space vectors are synthesized from voltage and current measurements. Second, the instantaneous rotor ...

Indicating instrument for vehicle

Patent Number: 8102139
Publication Date: 2012-01-24
Inventor: Nakane, Hideyuki

An indicating instrument includes a step motor having a field winding, a pointer, a reduction gear mechanism having gears, a stopper device for stopping the pointer at a stopper position, a detecting device for detecting induced voltage of the winding at each of detecting points that include a zero point corresponding to the stopper position, a control device for controlling a drive signal, and an updating device for updating the zero point based on the induced voltage during zero-reset ...

Electric power steering apparatus and method of assembling the same

Patent Number: 8102138
Publication Date: 2012-01-24
Inventors: Kawada, Hideaki; Kodama, Tetsuya; Shinohara, Shigeo; Senba, Takeshi; Sekine, Takaaki; Ooshima, Atsushi; Kobayashi, Seiichi; Shimizu, Yasuhiro; Hyoudou, Naoki; Endo, Shigeru; Horikoshi, Atsushi; Kashimoto, Keiji; Oumi, Tamotsu; Shimoda, Mitsuo

A motor control apparatus includes a steering column having inserted therein a steering shaft to which steering torque is transmitted, a reduction gear box coupled to the steering shaft, and an electric motor that transmits a steering assisting force to the steering shaft via a reduction mechanism in the reduction gear box. The electric motor and its control unit including a control board mounted with a control circuit, are provided side by side in the reduction gear box. A connection ...

Method of detecting a useful signal

Patent Number: 8102137
Publication Date: 2012-01-24
Inventor: Bitzer, Franz

A method of detecting a useful signal from a measurement signal that is overlaid by at least one interference signal for use in a control or regulating device, where the interference signal occurs with at least one known interference signal frequency. The method including the steps of detecting the measurement signal, performing a Fourier transformation on the measurement signal with reference to the interference signal frequency to detect the interference signal amplitude and phase, ...

Simultaneous zero verification for motors in a printing press

Patent Number: 8102136
Publication Date: 2012-01-24
Inventors: St. Ours, Joseph Adrian; Caven, Brian Patrick; Cote, Kevin Lauren

A method for determining accuracy of an actual position of a plurality of independent motors in a printing press is provided. The method includes commanding each of the plurality of motors in the printing press via a controller to move a desired initial position, comparing an actual position of each motor to the desired initial position of each motor, determining if the actual position of each motor is within a predetermined tolerance of the desired initial position, and resetting any motor ...

Motor and drive control system thereof

Patent Number: 8102135
Publication Date: 2012-01-24
Inventor: Takeuchi, Kesatoshi

Provided is a motor having a magnetic polar unit in which a permanent magnetic polar array having arranged therein alternately a plurality of permanent magnetic polar elements in alternate opposite poles is made to face a plurality of electromagnetic coil arrays alternately excited at opposite poles, and the permanent magnetic polar array is made to move thereby; wherein the motor further comprises a sensor for detecting the periodical magnetic change accompanying the movement of the ...

Mobile robot with hydraulic mechanism

Patent Number: 8102134
Publication Date: 2012-01-24
Inventor: Theobald, Daniel

A mobile robot along with a method and system for a mobile robot including a hydraulic powered mechanism operably connected to the mobile robot for movement of the hydraulic powered mechanism with respect to the mobile ...

Starting apparatus for at least two synchronous machines

Patent Number: 8102132
Publication Date: 2012-01-24
Inventors: Wieser, Rudolf; Keller, Tobias

A starting apparatus is disclosed for at least two synchronous machines, which starting apparatus includes an exciter unit which is provided for each synchronous machine and is associated with the respective synchronous machine. Each exciter unit can be connected to the field winding of the associated synchronous machine. A superordinate control unit is provided, with the superordinate control unit being connected via a communication link to each exciter unit. Furthermore, the starting ...

Yarn-tensioning device and arrangement and method for operating a creel

Patent Number: 8102131
Publication Date: 2012-01-24
Inventors: Jakob, Alfred; Kleiner, Andreas

The invention relates to a yarn-tensioning device for producing a specific thread pull on a thread (5) that is unwound from a winding point (7) of a creel (2) and is guided to a warping machine arrangement (1). Said yarn-tensioning device comprises a rotating body (18) which is at least partially wound round by threads and an electric motor (19) which is connected to the rotation body. Said motor (19) is equipped with at least one brake ...

Generator motor driving device and method for discharging charges from capacitor of generator motor driving device

Patent Number: 8098039
Publication Date: 2012-01-17
Inventors: Sato, Tomohisa; Endo, Takayoshi

The present invention provides a generator motor driving device that can promptly perform discharging of charges from the capacitor during a maintenance operation, and a capacitor discharge method to be implemented in the generator motor driving device. Power is supplied from the capacitor to the generator motor being driven by the engine, and the generator motor is driven, with the engine as a load. Rated constant current control is performed on the generator motor, and rated constant ...

Servomotor control system enabling high-speed oscillating motion to be highly precise

Patent Number: 8098038
Publication Date: 2012-01-17
Inventors: Okita, Tadashi; Toyozawa, Yukio; Sonoda, Naoto

A servomotor control system that includes a numerical control unit and servo control unit enables the use of learning control based on an angle synchronization method in high-speed oscillating motion performed by, for example, a jig grinder. The numerical control unit calculates a reference angle θ(=ωt), and also calculates a cyclic oscillation command F(t) according to the reference angle θ and a machining condition (angular velocity ω). The servo control unit calculates a difference ...

Vehicle door opening-closing apparatus

Patent Number: 8098037
Publication Date: 2012-01-17
Inventor: Sugiura, Takehiko

A vehicle door opening-closing apparatus is provided, which includes a vibration detector and a controller. The controller acquires an envelope formed by connecting crests or troughs of a waveform of vibration detected by the vibration detection sensor. The controller determines whether or not a shape of the envelope meets a condition. A vehicle door is controlled based on a result of determination by the ...

Electric power tool

Patent Number: 8098036
Publication Date: 2012-01-17
Inventors: Matsunaga, Yutaka; Suda, Hidekazu; Nishimiya, Takeshi

An electric power tool is provided that includes a motor as a driving source, a first operation switch, a first semiconductor switch, and a second semiconductor switch. The first operation switch is operated by a user to be turned ON/OFF. The first semiconductor switch, provided on a current path from the power source to the motor, includes at least one semiconductor switching device. When the first operation switch is OFF, the first semiconductor switch is turned OFF to interrupt the ...

Motor control unit

Patent Number: 8098035
Publication Date: 2012-01-17
Inventors: Mechi, Abdallah; Haga, Hitoshi; Sakakibara, Kenichi; Sekimoto, Morimitsu; Kawashima, Reiji; Maeda, Toshiyuki

A motor control unit (10) includes: a power converter (40) having a rectifier circuit (20) which rectifies an AC voltage from an AC power supply (31), a capacitor circuit (22) which receives an output of the rectifier circuit (20) and outputs a rectified voltage having pulses from both ends of a capacitor (13) and an inverter circuit (25) which receives the rectified voltage and outputs an AC voltage to the motor (30); and a ...

Motor drive circuit

Patent Number: 8098033
Publication Date: 2012-01-17
Inventor: Imai, Toshiyuki

A motor drive circuit comprising: a triangle wave generation circuit configured to charge/discharge a capacitor with a charging/discharging current having a current amount corresponding to an amplitude control voltage for controlling an amplitude of an oscillation voltage that varies in a triangle wave shape, and to output a charging voltage of the capacitor as the oscillation voltage; a pulse signal generation circuit configured to generate a pulse signal having a duty ratio corresponding ...

Control system for multiphase rotary machines

Patent Number: 8098032
Publication Date: 2012-01-17
Inventor: Yamada, Takahiro

A control system is designed to use a plurality of voltage vectors expressing a switching mode for a switching circuit to thereby control a difference between a current actually flowing through a multiphase rotary machine and a command current value therefor within an allowable range. The plurality of voltage vectors include a zero vector that allows line-to-line voltages in the multiphase rotary machine to be all zero, and a plurality of non-zero vectors that allow at least one of ...

Active brake unit

Patent Number: 8098031
Publication Date: 2012-01-17
Inventor: Chang, Qian

The invention relates to a circuit arrangement for recirculating the energy produced during the braking of electric motors into a supply system. The object of the invention is to implement the feeding of the energy that can be obtained when braking electric motors to the supply system without the use of an isolating transformer. Said object is solved by a forward branch (3), comprising a rectifier (32) connected to the supply system (1). The rectifier is guided via a ...

Drive unit for a door or gate, particularly for a garage door, and method for operating such drive unit

Patent Number: 8098030
Publication Date: 2012-01-17
Inventors: Theile, Ulrich; Dietz, Christian

A drive unit for a door or a gate includes an electric motor, a detection unit for detecting the position of the door or gate, the detection unit being coupled to the motor and providing an identical pulse sequence with every rotation of the motor, wherein the duration of one pulse in the sequence is different from the duration of the other pulses in the sequence, which are equal. All detected pulses are stored in a non-volatile memory. The drive unit includes an electronic control and ...