Abstract: An electric motor for viscous pumping, wherein the electric motor is a brushless DC motor configured to be driven by a low DC voltage of around 40-60 VDC, and includes: a rotor with permanent magnets; a stator with a stack of laminations and windings wound therearound; and a controller to provide electronic commutation of electric current flowing through the windings; wherein the windings and the stack of laminations are configured to handle at least 1 kW of continuous electric power from the controller, and the controller includes a feedback circuit including a rotation sensor coupled to the rotor and having an angular resolution of at least 1/500th of a revolution to allow the controller to control the torque generated by the electric motor to a corresponding extent.

Abstract: A device and method for determining operating modes of an AC asynchronous three-phase motor in an escalator system and computer-readable storage medium on which a computer program for implementing the method is stored. The operating modes include a first operating mode and a second operating mode, the AC asynchronous three-phase motor adopts a triangular wiring mode and a star wiring mode in the first operating mode and the second operating mode, respectively, the device includes: a memory; a processor coupled with the memory; and a computer program stored on the memory and running on the processor, the running of the computer program causes: A. obtaining a slip rate of the AC asynchronous three-phase motor; and B. determining whether the AC asynchronous three-phase motor needs to be switched between the first operating mode and the second operating mode based on the slip rate.

Abstract: A rotating machine control device for controlling a rotating machine having a stator winding and a field winding includes a current command generation unit which generates a current command value on the basis of the temperature of the rotating machine. The current command generation unit includes a constraint condition setting unit which calculates a constraint condition on the basis of a torque command, stator winding voltage, stator winding current, and field winding current, an optimization calculation unit which calculates and outputs the current command value, using the constraint condition and an evaluation function, and a constraint condition update unit which updates the constraint condition on the basis of the temperature of the rotating machine. The current command generation unit calculates and outputs the current command value, using the updated constraint condition.

Abstract: A control device for an AC rotating machine includes: switching control means for controlling inverters and motor relays 15; and abnormality detection means for detecting an abnormality in each system and outputting a result of the detection to the switching control means. When the abnormality detection means detects an abnormality in at least one of the systems, the switching control means causes the motor relay to block a circuit between windings and the inverter in the system in which the abnormality has been detected, and continues normal control in a system other than the system in which the abnormality has been detected.

Abstract: A more efficient power supply system comprises a rectifier, a low voltage inverter, and a low voltage actuator, the rectifier converting a mains AC voltage into a low input DC voltage, the low voltage inverter connected to the rectifier and converting the low input DC voltage into a low supply AC voltage, and the low voltage inverter connected to the low voltage actuator to supply the low voltage actuator with power via the low supply AC voltage. A DC-DC converter connected to the rectifier converts the low input DC voltage into an extra-low DC voltage. An extra-low voltage inverter connected to the DC-DC converter converts the extra-low DC voltage into an extra-low supply AC voltage. The extra-low voltage inverter connected to an extra-low voltage actuator supplies the extra-low voltage actuator with power via the extra-low supply AC voltage.

Abstract: In some implementations, a measurement circuit may drive, using a first transistor, a first node of a haptic load. The measurement circuit may trigger a first comparator when a voltage driving the haptic load satisfies a first condition. The first comparator may have a first node connected, in parallel, to a drain of a second transistor and may have a second node connected to the first node of the haptic load. Additionally, the second transistor may have a gate connected to a gate of the first transistor and may have the drain connected to a first reference current.

Abstract: A method is for use with a synchronous machine having a stator and a rotor with or without permanent magnets. In operation, electric current of the synchronous machine responsive to the synchronous machine being actuated via clocked terminal voltages is measured. A magnetic flux linkage is determined based on the clocked terminal voltages and the measured electric current. A profile of the magnetic flux linkage as a function of rotation of the rotor, under a boundary condition of an at least two-dimensional electric current vector that is unchanged in coordinates of the stator, is used to detect a position of the rotor. The synchronous machine is controlled according to the rotor position.

Abstract: In accordance with at least one aspect of this disclosure, a system includes a generator control relay configured to electrically connect a generator and an exciter switch drive to drive an exciter switch. A first processor is operatively connected to control a state of the generator control relay to control the electrical connection between a generator and the exciter switch drive. The system includes an exciter drive configured to generate excitation current for field windings of a generator system based on a state of the exciter switch. A second processor is operatively connected to control the exciter drive and to communicate with the first processor during a fault event to place the generator control relay in an open state, disconnecting the generator from the exciter switch drive to prevent generation of excitation current. In certain embodiments, the first processor can include a microcontroller and the second processor can include a voltage regulation processor.

Abstract: A motor control system includes a variable voltage supply in signal communication with a direct current (DC) motor. The DC motor includes a rotor induced to rotate in response to a drive current generated by a variable supply voltage delivered by the voltage supply. The rotation of the rotor 103 generates a mechanical force that drives a component. A ripple count circuit 104 is configured to filter the drive current based on a rotational speed (?) of the rotor 103 to generate a filtered drive current signal, and to generate a varying threshold based on the filtered drive current signal. Based on a comparison between the filtered drive current signal and the varying threshold, the ripple count circuit 104 generates a pulsed output signal indicative of the rotational speed (?) of the rotor and a rotational position (?) of the rotor.

Abstract: This three-phase AC motor drive device is provided with: a load; an inverter device 1 for driving the load; an MCOK_A_4 connected between the inverter device 1 and the load and electrically connecting or disconnecting the inverter device 1 to or from the load; a voltage detector 21a having terminals respectively connected to the circuits of at least two phases to detect the voltages between the three phases; and a current detector 11 for detecting the currents of the three phases. In the connection from the inverter device 1 to the load, the inverter device 1, the MCOK_A_4, the voltage detector 21a, the current detector 11, and the load are aligned in this order.

Abstract: A fan motor controller comprises a pulse width modulation signal, a switch circuit, a control unit, and a frequency judging unit. The switch circuit is coupled to a fan motor for supplying a driving current to the fan motor. The control unit generates a control signal to the switch circuit, so as to control the switch circuit. The frequency judging unit receives the pulse width modulation signal for generating a judging signal to the control unit. The pulse width modulation signal is configured to adjust a speed of a fan. The pulse width modulation signal has a frequency. Based on the frequency and a judgment rule, the fan motor controller is configured to attain the function of switching between the forward direction and the reverse direction of the fan.

Abstract: A power tool including an electric motor is provided. The tool includes a substantially disc-shaped printed circuit board (PCB), power switches mounted on the PCB; magnetic sensors mounted on the PCB facing the motor; a heat sink in thermal communication with the power switches disposed between the PCB and the electric motor; and a molded casing structurally securing the heat sink relative to the PCB. The molded casing includes a center opening, at least one first opening provided at a first radial distance from the center opening arranged to receive the magnetic sensors therein, and at least one second opening provided at a second radial distance from the center opening arranged to securely receive the heat sink therein.

Abstract: An inverter is provided for driving a motor. A first capacitor, and a second capacitor including capacitors connected in series, are connected in parallel to a DC power supply. A switch circuit having switching elements is connected between the inverter and the second capacitor. A control circuit is provided for controlling the inverter and the switch circuit. The control circuit performs control to switch the switch circuit so as to supply current from the second capacitor to the inverter during 3-level operation, and supply current from both of the first capacitor and the second capacitor to the inverter during 2-level operation.

Abstract: For improving Maximum Torque per Amps (MTPA) control, a method generates an offline MTPA curve based on an autotune test for a motor, which is used as offline MTPA control in order to run a motor at a high efficiency operation point. Another online method generates a search zone for the MTPA curve for a given torque point. The search zone includes an upper D-axis reference current and a lower D-axis reference current for the given torque point. The method iteratively modifies a D-axis reference current between the upper D-axis reference current and the lower D-axis reference current of the search zone. The method modifies a Q-axis reference current to output the given torque. The method updates a corresponding current pair of the given torque point to the modified D-axis reference current and the modified Q-axis reference current with a lowest current amplitude to improve MTPA control of the motor.

Abstract: An apparatus and a method for generating a voice coil actuator (VCA) signal is described. A drive signal is generated to drive the VCA and a resulting current signal from the VCA detected. The frequency of the drive signal is adapted in response to detecting an asymmetry in the current signal.

Abstract: A method for controlling an electronic watch is a method for controlling an electronic watch having a control device, the method comprising: when performing a first control processing, operating a first driving circuit to output a first motor drive signal, and rewriting a first polarity information in accordance with an output of the first motor drive signal, when ending output of the first motor drive signal, matching a second polarity information with the first polarity information, when performing a second control processing, operating a second driving circuit to output a second motor drive signal, and rewriting the second polarity information in accordance with an output of the second motor drive signal, and when ending output of the second motor drive signal, matching the first polarity information with the second polarity information.

Abstract: A motor control device of an embodiment includes a power supply unit that supplies AC power to a motor; a current detection unit that detects a current flowing through a winding of the motor; a speed and electric angle estimation unit that estimates a rotation speed and an electric angle of the motor based on a voltage outputted by the power supply unit and the current; a coordinate conversion unit that obtains an excitation current and a torque current based on the current and the electric angle; a torque current command determination unit that substitutes a predicted torque calculated based on a mechanical motion equation into a torque component current command value calculated based on a torque expression of a vector control coordinate, to generate a torque component current command value for bringing a difference between an inputted speed command and an estimated speed closer to zero; and a model prediction control unit that applies, to a plurality of predicted currents including a current change ratio de

Abstract: A linear motor system includes: a stator including first to tenth coils; a mover including a permanent magnet; a switcher that switches one or more power supply target coils; and a control device that supplies power to the one or more power supply target coils by using a deviation integral value obtained by integrating a speed deviation that is a difference between an instructed speed of the mover and an actual speed of the mover. The control device includes: a compensator that calculates a post-division deviation integral value by dividing a post-summation deviation integral value, which is a value obtained by summing the deviation integral value used to supply power to each of the one or more power supply target coils immediately before the switching, by the total number of the one or more power supply target coils immediately after the switching; and a current control unit.

Abstract: A method of calibrating a motor assembly includes selecting an electric motor and a motor controller for the motor assembly, obtaining at least one electric motor parameter of the electric motor, determining a correction factor for the electric motor based upon the at least one electric motor parameter, and programming the motor controller with the correction factor.

Abstract: Parameters relating to rotation of a motor (2) measured every constant time are acquired and the moving average of each constant interval of the parameters is calculated. The calculated moving averages are input to a training model trained so as to output a temperature of magnets attached to a rotor (7) of the motor (2) when the moving averages of the parameters relating to rotation of the motor (2) are input, and an estimated value of the magnet temperature output from the model is acquired. Next, the acquired estimated value of the magnet temperature is output.