Abstract: A motor control system includes a multi-phase motor, a multi-phase inverter circuit, a plurality of controllable switches, a plurality of sensors, and a monitor circuit. Each controllable switch is coupled in series between a second terminal of the motor and a common winding node and is responsive to switch commands to operate in either a first switch mode or a second switch mode. The monitor circuit is responsive to sensor signals to determine when one or more of the sensed motor state variables attains a predetermined threshold magnitude and when one or more of the sensed motor state variables attains the predetermined threshold magnitude, to supply a switch command to one or more of the controllable switches that causes the one or more controllable switches to operate in the second switch mode.

Abstract: An electric motor drive device includes a wire-connected-state switching unit to switch a wire connected state of stator windings of an electric motor to either a delta connected state or a star connected state, an inverter to drive the electric motor, and a relay-voltage detection circuit to detect a relay voltage (VR) that is a power-supply voltage of the wire-connected-state switching unit, and to deactivate the inverter when the relay voltage (VR) is decreased below a threshold.

Abstract: A motor controller, an active short circuit thereof, and a method for controlling active short via the same. An enabling signal is generated and outputted in response to determining that a vehicle is to enter a safe mode and a speed of a motor exceeds a threshold. Currents of a direct-axis and a quadrature-axis of the motor are adjusted to characteristic currents according to the enabling signal. An action flag signal and a control signal that corresponds to the enabling signal are generated and outputted in response to determining that the currents of the direct-axis and the quadrature-axis are adjusted to be the characteristic currents. A driving signal corresponding to the control signal is generated and outputted according to the action flag signal. A driving circuit safely controls a corresponding switch transistor in the inverter to be turned on based on the driving signal.

Abstract: To provide a rotary electric machine apparatus which can make the rotary electric machine output torque, and can change characteristics of a rotary electric machine according to change of the DC power voltage, even if failure occurs in one DC power source. A rotary electric machine apparatus (1) is provided with a power source switching mechanism (23) that switches between the DC power of low voltage and the DC power of high voltage; a winding connection switching mechanism (24) that switches interconnection of the plural-phase windings between a first winding connection state, and a second winding connection state in which an induced voltage constant of windings becomes lower than the first winding connection state; a inverter (12) provided with the switching devices; and a controller (25) that switches the power source switching mechanism (23), switches the winding connection switching mechanism (24), and controls on/off of the switching devices.

Abstract: To obtain a power conversion device capable of reducing a loss of the power conversion device to improve fuel efficiency and electricity efficiency of an electrically driven vehicle. Provided is a power conversion device (1), which is to be mounted to a vehicle (VCL) configured to travel by using a drive motor (M1) as a motive power source. The power conversion device (1) includes inverters (100, 200) each configured to control the drive motor (M1) by having a plurality of switching elements (Q101 to Q106, Q201 to Q206) subjected to switching control. In the power conversion device (1), each of the plurality of switching elements (Q101 to Q106, Q201 to Q206) is formed of a wide band gap semiconductor.

Abstract: A control device for a pole-number switching electric motor applied to a system including an electric motor capable of switching a number of poles, and an inverter electrically connected to stator windings of the electric motor; includes: a basic operation unit configured to operate the inverter to control a current amplitude which is magnitude of a current vector flowing in the stator winding, and a switching operation unit configured to operate the inverter to reduce the current amplitude before switching and increase the current amplitude after switching. The switching operation unit, the pole number switching period, operates the inverter so that a total value of the current amplitude before switching and the current amplitude after switching does not exceed a limiting current value.

Abstract: A driving device drives a motor having coils. The driving device includes a connection switching unit to switch a connection state of the coils, a temperature sensor to detect a room temperature, and a controller to switch the connection state of the coils based on a detected temperature by the temperature sensor.

Abstract: A motor drive apparatus includes: a DC-side capacitor charged with direct current power; an inverter unit comprising multiple top switches and bottom switches, performing a switching operation so as to convert power stored in the DC-side capacitor into alternating current power, and outputting the converted alternating current power to a motor; a shunt resistor for detecting a current flowing through the DC-side capacitor; and a controller for controlling the inverter unit to perform dynamic braking for stopping the motor. Before the dynamic braking is performed, the controller controls the inverter unit to gradually increase a phase current flowing through the bottom switches.

Abstract: A motor control center system according to the present invention includes a first integrated module and a second integrated module which are provided in correspondence with a motor control center and in a dual structure; a plurality of protection control modules provided in correspondence with respective motor units; and a multipoint bus to which the protection control modules are connected such that a serial communication network is formed between the first integrated module and second integrated module and the plurality of protection control modules, wherein one end of the multipoint bus is commonly connected to a first serial communication port of the first integrated module and a first serial communication port of the second integrated module, and the other end of the multipoint bus is commonly connected to a second serial communication port of the first integrated module and a second serial communication port of the second integrated module.

Abstract: Disclosed embodiments include a method for closed loop phase tracking comprised of determining a first estimated resonant frequency, generating a motor drive signal at the first estimated resonant frequency and applying the motor drive signal to a motor, measuring current and voltage of the motor drive signal, and filtering the measurements of current and voltage of the motor drive signal. The phase difference between the filtered current and voltage waveforms is measured and a second estimated resonant frequency is calculated. The generated motor drive frequency is adjusted to equal the second estimated resonant frequency.

Abstract: A vehicular propulsion system is described that uses a plurality of direct current (DC) motors operatively attached to a common drive shaft or shafts of an electric vehicle (EV) or boat. Each motor is powered separately by direct current from a battery cassette or trays swappably inserted into the chassis of the vehicle. The battery cassettes are secured in racks, with one or more individual battery cassettes connected to each of individual motors. The individual battery cassettes are sized to have a weight suitable so as to be readily swapped out as needed for recharging, maintenance or replacement, enabling vehicle range to be extended en route by exchanging depleted battery cassettes for new batteries whenever needed. DC motors may be selected to obtain efficiencies greater than obtainable with AC motors, but require no expensive inverter unit.

Abstract: A method for determining a direct inductance and a quadrature inductance of an electrical machine is included. The method includes controlling the electrical machine so that a stator generates a first magnetic field rotating at a first rotation frequency to rotationally drive a rotor of the electrical machine, and a second magnetic field that varies periodically at a second frequency for measuring a portion of the phase currents flowing through the stator windings of the electrical machine during controlling of the electrical machine. The method further includes determining an amplitude spectrum of a given electrical quantity determined based on a portion of the phase currents, searching in the amplitude spectrum for a peak present at a frequency that is dependent on the second frequency, determining an amplitude of each peak found, and determining the direct inductance and the quadrature inductance from the amplitudes of two peaks found.

Abstract: A propulsion system is described that includes an electrical bus, a generator configured to provide electrical power to the electrical bus, a plurality of propulsory configured to provide thrust by simultaneously being driven by the electrical power at the electrical bus, and a controller. The controller is configured to synchronize a rotational speed of an individual propulsor from the plurality of propulsory with a rotational speed of the generator after the individual propulsor has become unsynchronized with the rotational speed of the generator by controlling at least one of the rotational speed of the generator, nozzle area of the individual propulsor, or a pitch angle of the individual propulsor.

Abstract: A ride-on toy with electronic speed controller for superior user experience is described herein. A ride-on toy as described herein may be in the form of a ride-on toy car, truck, jeep, motorcycle or the like and may be used with up to a 24-volt power source as opposed to a 12-volt power source as is common in the art. An electronic speed controller of the present disclosure provides variable speed control to at least one and preferably at least two motors from separate accelerator and brake mechanisms such as pedals. Conventional ride-on toys such as those described herein typically contain a single-pole switch such as pedal that provides all-or-nothing power to a motor as opposed to modulation of two motors by two actuation means. A ride-on toy as described herein may combine various controller components in unique ways to achieve the superior results as described herein.

Abstract: An electric motor drive system is provided. It includes a rotor having permanent magnets arranged therein and a stator surrounding the rotor an inverter having switches arranged therein, the switches operable to draw current from a direct current bus and operate the electric machine through windings of the stator and a controller operable to receive a source current limit, IS, and a source voltage limit, VDC, both associated with the direct current bus is also provided. The invertor is responding to a torque demand to operate the switches of the inverter to generate an alternating current corresponding to the torque demand and according to a torque limit defined by a source current torque limit corresponding to the source current limit when the source current torque limit is less than or equal to a source voltage torque limit corresponding to the source voltage limit.

Abstract: An inverter system and method for driving an alternating current induction motor connected to a fluid transfer pump, including PWM control of power switching devices and fast-acting shutdown circuitry to disable the power switching devices when unintended or unexpected conditions are detected. The inverter system further includes start/stop safety logic, fault current detection and a fast acting current limit circuit incorporating a programmable current limit, operational status and parameter monitoring and communication, visual signalization, locked rotor detection, and the ability to incorporate closed loop control and remote operation into systems while they are in service.

Abstract: A control device for controlling the current of a rotating field machine of a motor vehicle, includes a current controller for determining a fundamental of an output voltage for a respective operating point, a controller for modulating the output voltage by driving a rectifier of the control device based on a pulse pattern optimized offline for the respective operating point, and a current sensor for sampling a harmonics-impacted output current, resulting from the pulse pattern that is used, of the rectifier and for returning the sampled output current to the current controller. Sampling times for sampling the output current are optimized offline in a manner specific to the pulse pattern and are predetermined as those times at which a deviation between the harmonics-impacted output current and a fundamental of the output current is less than a predetermined threshold value.

Abstract: Provided is a drive circuit for a two-coil stepper motor, including: a rotor; a stator including first, second, and third stator magnetic-pole portions; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; a drive pulse generation circuit configured to output a drive pulse; a detection pulse generation circuit configured to output a detection pulse for detecting counter-electromotive currents generated in the coil A and the coil B; and a rotation detection circuit configured to receive a detection signal generated due to the detection pulse as input to determine whether or not the rotor has rotated.

Abstract: An electric motor drive unit includes a winding switching unit that switches a configuration of windings of an electric motor, a winding switching instruction unit that generates an instruction signal for the winding switching unit, and a winding configuration retention unit to which the instruction signal generated by the winding switching instruction unit is input, and if the input instruction signal has a first value, outputs a signal corresponding to the input instruction signal to the winding switching unit, and if the input instruction signal has a second value different from the first value, continues outputting a signal that has been output to the winding switching unit before the reception of the second value, the first value indicating an instruction on the configuration of the windings.

Abstract: An inverter device includes: an inverter, a power supply current detection sensor, a phase current detection sensor, a three-phase voltage command calculator, and an inverter on/off signal generation unit. The phase current detection sensor detects a phase current in one phase of the inverter. The inverter on/off signal generation unit generates on/off signals based on the phase voltage commands. The three-phase voltage command calculator uses the power supply current and the phase current detected by the power supply current detection sensor and the phase current detection sensor, respectively, so as to calculate phase voltage commands directed to the inverter, and at a center time point of a period in which an upper arm switching element corresponding to one phase out of two phases for which the phase current detection sensor is not provided is on, and lower arm switching elements corresponding to the other two phases are on.