Abstract: A power conversion device according to an embodiment includes a cell, a first sensor, a second sensor, a storage, a first controller, and a second controller. The first controller is configured to control or protect the cell on the basis of at least one of an output result of the first sensor and an output result of the second sensor. The second controller, in a case in which a change in at least one of the output result of the first sensor and the output result of the second sensor satisfies a first condition, is configured to execute at least one of a first operation of storing the output result of the first sensor in the storage, a second operation of storing the output result of the first sensor in the storage over a second period longer than a first period, and a third operation of storing the output result of the second sensor instead of the output result of the first sensor.

Abstract: Method and apparatus are disclosed for accelerometer-based windshield wiper monitoring. A vehicle includes an accelerometer affixed to a vehicle window, a windshield wiper to actuate across the vehicle window, and a processor. The processor is configured to determine an acoustic profile corresponding to the windshield wiper based on structure-borne audio data received from the accelerometer, determine whether a bandlimited decibel level of the acoustic profile exceeds a threshold, and responsively provide an alert via a vehicle display.

Abstract: Methods and systems for controlling an electric motor are provided. An electric motor controller is configured to be coupled to an electric motor. The controller includes a rectifier, an inverter coupled to the rectifier, and a control unit coupled to the inverter. The rectifier is configured to rectify an alternating current (AC) input voltage to produce a pulsed direct current (DC) voltage that drops to approximately zero during each cycle when the AC input voltage transits zero. Energy is stored on a load coupled to the motor when AC input voltage is available. The inverter is configured to receive the DC voltage and to provide a conditioned output voltage to the motor. The control unit is configured to manage energy transfer between the motor and the load such that the motor generates positive torque when the DC voltage supplied to the inverter has approximately 100% voltage ripple.

Abstract: The present disclosure provides a system and method for controlling operation of a resonance MEMS mirror. The system and method includes activating either an in-plane or staggered MEMS mirror via sets of activation pulses applied to the MEMS mirror, detecting current at the MEMS mirror, generating a window for detecting a change in a direction of the current at the MEMS mirror, and terminating the window and the activation pulse if a change in the current direction is detected during the window. In some embodiments, two sets of activation pulses are applied to the MEMS mirror.

Abstract: A fan and a motor thereof are provided. The motor includes a motor drive device. The motor drive device includes a printed circuit board. A control management unit and a voltage converter are arranged on the printed circuit board, the control management unit classifies target rotation speed signals provided by an ECU into multiple rotation speed intervals, with each rotation speed interval corresponding to a fixed duty ratio. The control management unit receives a target rotation speed signal transmitted from the ECU in a real-time manner, and outputs a pulse width modulation signal having a duty ratio corresponding to the rotation speed interval to which the target rotation speed signal transmitted from the ECU belongs.

Abstract: A semiconductor device includes a semiconductor chip, a lead frame and one bonding wire and the other bonding wire which couple together the semiconductor chip and the lead frame. The semiconductor chip includes one pad which is coupled to one bonding wire and to which an output signal which has been generated in the semiconductor chip is supplied, the other pad which is coupled to the other bonding wire and to which a feedback signal is supplied from the lead frame and a fault detection circuit which compares the output signal which is supplied to one pad with the feedback signal which is supplied to the other pad.

Abstract: A power-consumption-amount estimation apparatus estimating a power consumption amount of an industrial machine including a motor, a machine driven by the motor, and an amplifier driving the motor, includes: an operation-pattern-information obtaining unit; a dynamics-information obtaining unit; a circuit-information obtaining unit obtaining amplifier information and motor information; and a power-consumption-amount calculation unit executing a process of calculating power of each of the motor and the regenerative resistor based on operation-pattern information, dynamics information, amplifier information, motor information, and a bus voltage simulated value and calculating power of the industrial machine based on the calculated power and execute a process of updating the bus voltage based on the calculated power of each of the motor and the regenerative resistor and the calculated power of the industrial machine, over a specified period, and calculating a power consumption amount of the industrial machine by i

Abstract: A control method implemented in a variable speed drive for starting a synchronous electric motor, said method including the application, as input, of a reference speed according to a predefined speed profile, the determination of a reference position based on the reference speed that is applied as input, the determination of a voltage in a rotating frame of reference, based on the reference speed that is applied as input, the determination of control voltages to be applied to each output phase depending, on the one hand, on the determined reference position and, on the other hand, on said voltage determined in the rotating frame of reference, and the application of the control voltages to each output phase to obtain an alignment of the position of the rotor of said motor with the reference position.

Abstract: A motor controller includes a driver, a current detector, and a command generator. The driver is configured to drive a power converter based on a flux command on which an exploration signal is superimposed. The current detector is configured to detect an output current output from the power converter that has been driven by the driver. The command generator is configured to generate the flux command so as to reduce a current component, among current components included in the output current detected by the current detector, that corresponds to the exploration signal.

Abstract: A method, according to the present invention, of adjusting control parameters used in a control apparatus of an electric motor includes the steps of: computing a first frequency characteristic (Step 1); computing a present speed-proportional gain range (Step 2); computing a present mechanical-system characteristic constant (Step 3); computing a present proportional gain range (Step 4); computing a secular characteristic (Step 5); computing a secular speed-proportional gain range (Step 6); computing a secular proportional gain range (Step 7); and selecting proportional gain values (Step 8).

Abstract: A control system for a vehicle drive motor includes a motor torque obtaining portion, a current distributing state obtaining portion obtaining a state of current distribution to coils of respective phases of a stator of the motor, a temperature sensor detecting temperature of a specific phase coil, a motor torque control portion updating other phase estimated temperatures by using the coil sensor temperature and an added-up value of a temperature rise per unit time of each of other phase coils at each time point, the motor torque control portion controlling the motor torque by using the other phase estimated temperatures, wherein the temperature rise per unit time of each of the other phase coils at each time point is determined by the motor torque control portion in accordance with a combination of the motor torque and the state of current distribution at each time point.

Abstract: Methods and apparatus for determining a position of a rotor in motor, such as a three-phase motor by determining first and second ones of sectors in which a first one of the magnetic poles of the rotor may be positioned by driving phase pairs with complementary signals and examining a voltage of a floating one of the phases. Embodiments can further include driving first and second currents towards the first and second ones of the sectors and analyzing a time for each of the first and second currents to reach a threshold to identify which of the first and second ones of the sectors is aligned with the first one of the magnetic poles of the rotor.

Abstract: An intelligent cooperative control system and method thereof. A parallel structure for low-voltage multi-module permanent magnet synchronous motor cooperative control units is adopted to realize control of low-voltage high power, control of low-speed large torque and system redundancy control; a double-parallel PWM rectifier circuit structure is used, when the system is in unbalanced power supply network environments; a resonant pole-type three-phase soft-switching inverter circuit is used as an inverter unit to improve utilization of DC bus voltage and to greatly reduce device switch losses at high frequencies; a current control and speed estimation unit is used, so that rotor speed and phase angle information is accurately estimated with low cost and high reliability; a controlled object is the multi-module permanent magnet synchronous motor, so that the problems of difficulties in motor installation, transportation and maintenance of a high-power electric drive system and the like are solved.

Abstract: A motor control system, in some embodiments, comprises: a voltage divider circuit having an output node, a voltage on said output node representing a desired motor rotation direction; control logic configured to receive an indication of said voltage; and a motor controller coupled to the control logic, wherein, if said indication of the voltage on the output node falls outside of a predetermined range, the control logic is configured to issue a motor stop signal to the motor controller indicating that at least one resistor of the voltage divider circuit is defective or is missing from the voltage divider circuit.

Abstract: Disclosed examples include power conversion systems and methods to operate an inverter to drive a motor load through an intervening output filter, a transformer and a cable, including a current regulator to compute a command value according to a current reference value and a motor current feedback value, a cross-coupled feedforward component to compensate the command value by an estimated cross-coupled voltage value to compute a control output value, a cross-coupled object component to compute the motor current feedback value according to a voltage value using a plant transfer function representing the output filter, the transformer, the cable and the motor load, and a controller to provide the inverter switching control signals to control the inverter according to the control output value.

Abstract: The present invention relates to the field of power electronics and electric engines, and describes a harmonic content correction system in power systems. The invention solves the space and weight problem associated with the core of a harmonic content correction inductor, also providing performance advantages of electric engines, such as higher available voltage at full load and higher rotational speed at full load. The invention is particularly useful in refrigeration compressors comprising a switching device my associated with a reactive element.

Abstract: An auxiliary power supply system for an electric motor of an electric vehicle, comprising supercapacitors to generate a first auxiliary power supply, batteries to generate a second auxiliary power supply, one single common bidirectional converter and a control logic, which is configured for: (i) supplying power to the electric motor by means of network power supply voltage and through the energy stored in the supercapacitors during the acceleration of the electric vehicle; (ii) charging the supercapacitors during the braking of the electric vehicle, harvesting kinetic energy; (iii) supplying power to the electric motor through the sole energy of the batteries in the absence of the network power supply voltage; and (iv) charging the batteries during the running at constant speed and the parking of the electric vehicle.

Abstract: A solar power system comprising a solar panel, a load, and a battery pack group. The load comprising an electric motor operatively coupled with a propeller. The battery pack group comprises one or more voltage controllable battery packs, each of said one or more voltage controllable battery packs comprising a plurality of battery cells. The voltage controllable battery packs having a rigid printed circuit board electrically coupled with the plurality of battery cells, the rigid printed circuit board including an interconnect connector to electrically couple with a corresponding interconnect connector of a second voltage controllable battery pack.

Abstract: Overvoltage protection apparatuses, systems and methods for variable frequency motor drives are disclosed. In an exemplary embodiment, a variable frequency motor drive system including a rectifier, a DC bus electrically coupled with the rectifier, and an inverter electrically coupled with the DC bus is provided. A protection device electrically coupled with the rectifier and configured to interrupt power supply to the system based upon fault conditions is provided. A controller is provided and configured to receive information indicative of a voltage of the DC bus, process the received information to model a condition of at least one component of the variable frequency motor drive, and control the protection device to interrupt power supply to the variable frequency motor drive if the modeled condition meets a fault criterion.

Abstract: Apparatus and methods of operating an electric motor are provided, comprising energizing a plurality of stator coils in sequence to rotate a rotor. Each said coil is energized with a repeating pulse sequence comprising at least a first portion and a second portion, the first and second portions repeating alternately to form the repeating pulse sequence. The first portion comprises a first pattern of pulses, each pulse in the first pattern having either a first polarity or second polarity, and at least two consecutive pulses in the first pattern having the same polarity. The second portion comprises a second pattern of pulses, the second pattern of pulses having the same pattern as said first pattern of pulses, but having inverted polarity with respect to said first pattern of pulses.