490 results about "Motor circuit" patented technology

A method is disclosed for determining repeatable runout (RRO) cancellation values in a disk drive having a head disk assembly (HDA) and a sampled servo controller. The HDA includes a disk having distributed position information in servo wedges, a rotary actuator carrying a head that periodically reads the position information, and a voice coil motor circuit that responds to a control effort signal. The servo controller periodically adjusts the control effort signal during a track-following operation. In the method, the position information related to a predetermined track is read during track following for more than one disk rotation. The position information is averaged for each servo wedge obtained during the disk rotations. The averaged servo position values are filtered with a filter for compensating effects of the sampled servo controller, which tend to distort the averaged servo position values, to generate the RRO cancellation values for the predetermined track.

A motor drive circuit comprises positive and negative input terminals for connection of the motor circuit to a DC supply, a DC link filter connected between the input terminals: an electric motor having at least two phases, a plurality of motor drive sub-circuits, each connected to a respective phase of the electric motor and which each control the flow of current into or out of the respective phase of the motor that has been drawn from the supply through the DC link filter, and a switching means provided in the electrical path between the DC link filter and the electric motor drive sub-circuits, the switching means being movable between a closed position in which it connects the DC link filter to the motor drive sub-circuits, and an open position which isolates the DC link filter from the motor drive sub-circuits.

A thermal management system for an electric vehicle includes a motor circuit for cooling a motor circuit thermal load, a cabin heating circuit for heating a cabin heater and a battery circuit for managing the temperature of a battery circuit thermal load. All of these circuits can fluidically communicate with each other and a single radiator can cool the fluid from all of these circuits.

A method and system to calibrate a motor circuit protection device is disclosed. An example method calibrates a signal chain of a circuit breaker. The signal chain includes a current transformer, a burden resistor, a stored energy circuit and a controller. The circuit breaker includes a memory coupled to the controller. A calibration instruction routine is written in a first location of the memory. A test current is injected in the circuit breaker signal chain. The test current peak of the test current in the circuit breaker signal chain is measured. Data indicative of the test current peak is stored in a second location of the memory. The test current peak data is read from the second location of the memory. The test current peak data is compared with nominal current data related to the signal chain remotely from the circuit breaker. A calibration factor is determined based on the comparison.

An electromagnetic switch is disclosed as having an electromagnetic switch, operative to open or close a main contact of a motor circuit, and a solenoid having a function to push a pinion gear to a position away from a motor. The electromagnetic switch and the solenoid are placed in series in a unitary structure such that the electromagnetic switch and the solenoid have a switch case and a solenoid case both of which are integrally formed with each other to be contiguous in an axial direction.Further, a stationary core for the electromagnet and a stationary core for the solenoid are integrally formed and an operational direction of a plunger for the electromagnet and an operational direction of a plunger for the solenoid are set to be opposite in direction.

An electromagnetic switch unit comprises a solenoid device that pushes out a pinion gear to a ring gear side of an engine, and an electromagnetic switch that opens and closes a main point of contact of a motor circuit. The solenoid device and the electromagnetic switch are arranged in series in an axial direction, while a magnetic plate that forms a part of magnetic circuit between a first coil used for the solenoid device and a second coil used for the electromagnetic switch is shared by the solenoid device and the electromagnetic switch.

A power supply controller having final test and trim circuitry. In one embodiment, a power supply controller for switched mode power supply includes a selector circuit, a trim circuit, a shutdown circuit and a disable circuit. The trim circuit includes a programmable circuit connection that can be selected by the selector circuit by toggling a voltage on an external terminal such as for example a power supply terminal, a control terminal or a function terminal of the power supply controller. The programmable circuit connection in the trim circuit can be programmed by applying a programming voltage to the external terminal. The shutdown circuit shuts down the power supply controller if the temperature rises above an over temperature threshold voltage. The shutdown circuit includes adjustment circuitry that can be used to test the shutdown circuit. The adjustment circuitry can adjust and reduce the over temperature threshold of the power supply controller. Thus, the power supply controller can be tested without having to actually heat the part. The disable circuit includes a programmable circuit connection, which when programmed prevents further trimming of power supply controller and prevents adjustment of the shutdown circuit over temperature threshold.

A time-synchronized trip implementation for a motor circuit protector (MCP) having a reconfigurable microcontroller. The microcontroller causes a power supply to, be charged for an initial time period during a charging mode. An onboard comparator is configured for a predetermined self-protection level of the MCP, and fault currents that exceed the comparator's threshold will directly drive a solenoid to trip the MCP. The microcontroller reconfigures the comparator's threshold to both measure and charge the power supply toward a stored energy trip voltage, which will charge quickly when high fault currents are present. As a result, self-protection is not compromised. After the trip voltage is reached, the microcontroller reconfigures the onboard comparator's threshold for self-protection trip levels. When a trip event occurs in this mode, stored energy trip activation occurs. The MCP includes user-selectable trip settings, and the microcontroller reconfigures the comparator threshold levels for user-selectable self-protection levels.

A command current setting portion has a target value corrector that calculates d-axis and q-axis current command values idc, iqc that are to be supplied to an open-loop controller, based on d-axis and q-axis current target values id*, iq*. When d-axis and q-axis voltage target value vd*, vq* calculated from the d-axis and q-axis current target values id*, iq* by the motor circuit equations exceed a voltage limit, this target value corrector 26 corrects the d-axis and q-axis current target values id*, iq* by the field weakening control such that d-axis and q-axis voltages vd, vq and d-axis and q-axis currents id, iq satisfy √(vd2+vq2)≦Vlim and √(id2+iq2)≦Ilim respectively. The d-axis and q-axis current command values idc, iqc are obtained by this correction.

A motor starting apparatus (10) includes a motor starting relay (112) to switch a motor starting capacitor (110) into a motor circuit across a run capacitor (111). The system control (116) includes an electronic voltage measurement circuit to measure a winding voltage (113, 114) of the motor winding (102, 103). The system control (116) also includes a microprocessor to run an algorithm that causes the system control to switch the starting capacitor (110) out of the motor circuit when a measured winding voltage (113, 114) exceeds a winding voltage threshold. A method to start a motor includes the steps of determining a motor winding voltage (113, 114) threshold; closing the motor starting capacitor relay (112) when needed; closing a contactor (108, 109) to supply power to the motor starting apparatus and the motor circuit; measuring a winding voltage (113, 114); comparing the measured winding voltage (113, 114) to the voltage threshold; and opening the starting capacitor relay (112) when measured winding voltage (113, 114) exceeds the voltage threshold indicating that the motor has been started.

An angle computing section determines an angle of a rotor, and an angular velocity computing section determines angular velocity of the rotor. A command current computing section determines, from a steering torque and vehicle velocity, command currents and taken along d-q axes. An open loop control section determines, from command currents and angular velocity, command voltages taken along the d-q axes in accordance with motor circuit equations. A d-q axis / three-phase conversion section converts the command voltages into command voltages of three phases. A φ computing section determines the number of armature winding flux linkages included in a motor circuit equation from a q-axis command voltage, the current value detected by a current sensor, and the angular velocity. Circuit resistance including armature winding resistance R included in the motor circuit equation may also be determined by means of the same configuration.

A circuit for protecting against controller failure wherein the controller provides control signals for controlling a DC to AC inverter fed by a DC bus and driving a permanent magnet motor, the circuit comprising a first circuit for monitoring the DC bus voltage and, in the event the DC bus voltage exceeds a first threshold due to a counter EMF generated by the motor, for producing a signal to the controller to provide a switch state to the inverter whereby the counter EMF is dissipated substantially in a motor circuit resistance of the permanent magnet motor as a result of a short circuit condition provided by the switch state of the inverter, thereby preventing the DC bus voltage of the inverter from exceeding the first threshold and causing the permanent magnet motor speed to be reduced.

A servo unit is arranged to operate an actuator, and a brushless motor is utilized in the servo unit. The brushless motor includes a rotational portion provided with a shaft and a rotor magnet rotating integrally with the shaft, a bearing portion rotatably supporting the shaft, a housing provided with a cylindrical portion retaining the bearing portion and a base portion bulging radially outwards from an axially lower portion of the cylindrical portion, a stator provided with a stator core having an inner peripheral surface to radially oppose an outer peripheral surface of the cylindrical portion of the housing and coils formed by conductive wires wound around the stator core, and a motor circuit board disposed on an axially upper side of the base portion. The base portion of the housing is arranged on an outer peripheral surface with a substantially arcuate concave portion which is concave in a radially inward direction. The substantially arcuate concave portion contains a pin holder which is made of an electrically insulating material to hold a plurality of metal pins. The respective pins are electrically connected to the motor circuit board.

An electric cutoff circuit for preventing overheating of a load. The current shutoff circuit includes an FET connected to a motor circuit. A relay fault detection circuit is connected to the motor circuit to detect potential at the motor circuit. A CPU sends a control signal to a relay. The CPU determines whether a fault has occurred in the relay based on the control signal sent to the relay and the detection of the relay fault detection circuit. When determining that a fault has occurred in the relay, the CPU opens the FET to configure an open circuit with the motor circuit.

In order to provide a circulation pump for a conveyed liquid, comprising an electric motor, which is electronically commutated and has a rotor, a stator and a motor circuit, and an impeller that is connected in a rotationally fixed manner to the rotor, with advantageous properties, it is provided that the electric motor has an evaluation device, by means of which a flow rate of conveyed liquid through the circulation pump can be determined from a rotational speed of the rotor and / or a power consumption of the electric motor, and at least one signal output is provided, at which a flow rate signal and / or flow rate-dependent switching signal can be supplied by the circulation pump.

A method and system for supply voltage regulation in a motor circuit protector (MCP) that includes a current transformer coupled to a rectifier and a stored energy circuit. A solenoid is actuated by that circuit when a sufficient voltage is present. A controller having a configurable input is coupled to the stored energy circuit. Upon startup of the motor circuit protector, the controller causes the stored energy circuit to be charged to a startup voltage level via secondary current from the current transformer. The controller periodically interrupts the charging to measure the secondary current to detect fault levels. During startup, the configurable input is set to a comparator input for rapid current measurements. During run mode, the configurable input is set to an A / D input for accurate measurements. The controller measures the voltage of the stored energy circuit while charging it to a power level sufficient to actuate the solenoid.

In a steering control unit, a U-phase feed line branches into paired branch feed lines, phase-open MOSFETs are provided in middle portions of the branch feed lines, phase-open MOSFETs are provided in middle portions of a V-phase feed line and a W-phase feed line, and the phase-open MOSFETs are arranged in such a manner that parasitic diodes are in the same orientation with respect to a motor. When an abnormality occurs, all the phase-open MOSFETs are turned off. Then, a closed circuit, which includes phase coils and through which electric currents flow, is no longer present.

The disclosure relates to an electrical service switching device, in particular a circuit breaker, motor circuit breaker or the like, having a housing which has two housing halves and connecting means for electrical connection to busbars and / or power lines, having at least one electrical switching contact on which an arc is struck in an initial arcing chamber on disconnection of the electrical contact, with an arc quenching unit being provided adjacent to this, in order to quench the arc. An AC blowout device which comprises two iron plates adjacent to the initial chamber area in the lateral direction and guides the arc into the arc quenching device by magnetic interaction during AC operation, is provided. The housing wall has an opening in the area of the iron plates, through which a permanent magnet can be inserted in order to create an AC / DC blowout device, which guides the arc into the arc quenching device in both AC and DC operation, when the housing is assembled.

The invention is applicable to the technical field of circuit breakers and provides a circuit breaker testing method and terminal. The method comprises a step of connecting a high-voltage switch characteristic tester to an energy storage motor circuit and a control power supply circuit of a circuit breaker operating mechanism, and adjusting output voltage of the high-voltage switch characteristictester, a step of testing DC resistance of an energy storage motor circuit motor through the high-voltage switch characteristic tester, a step of adjusting the output voltage of the high-voltage switch characteristic tester to be rated voltage after a DC resistance test of the energy storage motor is completed and carrying out energy storage on the energy storage motor circuit, and a step of adjusting the output voltage to be a first preset multiple of the rated voltage after the energy storage of the energy storage motor circuit is completed, testing a switch-on control circuit of the controlpower supply circuit, adjusting the output voltage to be a second preset multiple of the rated voltage, and testing a switch-off control circuit of the control power supply circuit. According to theabove method, errors brought by human operations can be reduced, the work efficiency is improved, and operational risk is reduced.

A positioning / adjusting device includes a main unit and a controlling device. The main unit includes a motor unit and a circuit assembly. The motor unit includes a motor for moving the outreaching / retracting member. The circuit assembly includes a detecting circuit for detecting turns of a disc driven by the motor unit. The data regarding the turns are sent to a central processing unit and stored in a memory. The central processing unit sends signals to a control circuit to control clockwise or counterclockwise rotation or stopping of the motor unit. The controlling device includes a button circuit, wherein when one of several buttons of the button circuit is pushed, a corresponding signal is sent to the central processing unit to thereby control clockwise or counterclockwise rotation or stopping of the motor unit and to thereby setting an uppermost position and a lowermost position of the outreaching / retracting member.

The invention discloses an electronic phase change detection circuit of a position sensor-free brushless direct current motor, which is characterized in that a back electromotive force zero crossing point detection circuit detects a three-phase back electromotive force zero crossing point and sends the detect results isolated by a photoelectric isolating circuit into a microprocessor unit for further processing; a motor circuit, a detection circuit and the microprocessor unit are isolated from one another by the photoelectric isolating circuit, so that the interference generated by electric signals in the motor circuit and the detection circuit to an input signal of a microprocessor is prevented, the work stability and the system reliability of the microprocessor unit are enhanced, and a back electromotive force phase position is compensated through phase compensation information presorted in the microprocessor unit; and the back electromotive force zero crossing point and the phase change processing are determined, and further, the position of a rotor is determined without the adoption of the position sensor, so that the effect of the position sensor on the system reliability in the special environments of high temperature, high voltage, high interference, high vibration and the like is avoided, and further, and the system reliability is ensured.

The invention relates to a safety protection circuit and method of a door cover of a washing machine, belonging to the field of safety protection of the washing machine. The safety protection circuit comprises at least one main relay and a door cover switch circuit or an electronic door lock circuit, wherein the main relay is connected in series with a motor circuit of the washing machine; the door cover switch circuit comprises a door cover switch and a matched circuit thereof; the electronic door lock circuit comprises an electronic door lock and a matched circuit thereof; and the door cover switch or the electronic door lock is connected in series with a control circuit of the main relay. When the door cover or the electronic door lock is opened or unlocked, the main relay is opened so as to cut off a power supply of a motor. The invention ensures the safety of users through similar mechanical-type power interruption, thereby not only meeting the requirements for safety standards, but also saving the test cost and shortening the test period.

A circuit for protecting against controller failure wherein the controller provides control signals for controlling a DC to AC inverter fed by a DC bus and driving a permanent magnet motor, the circuit comprising a first circuit for monitoring the DC bus voltage and, in the event the DC bus voltage exceeds a first threshold due to a counter EMF generated by the motor, for producing a signal to the controller to provide a switch state to the inverter whereby the counter EMF is dissipated substantially in a motor circuit resistance of the permanent magnet motor as a result of a short circuit condition provided by the switch state of the inverter, thereby preventing the DC bus voltage of the inverter from exceeding the first threshold and causing the permanent magnet motor speed to be reduced.

The invention discloses an electric automobile thermal management system and a control method and device thereof. The electric automobile thermal management system comprises a motor circuit, a batterycircuit, an air conditioner cooling circuit, a four-way valve and a controller. The control method comprises the steps of obtaining a cooling fluid temperature of the motor circuit as a first temperature by using a first temperature sensor; obtaining a cooling fluid temperature of the battery circuit as a second temperature by using a second temperature sensor; obtaining a temperature of a BMS inthe battery circuit as a third temperature by using a third temperature sensor; and when the controller detects that the motor circuit has a fault or the battery circuit has a fault, controlling thefour-way valve to communicate with the motor circuit and the battery circuit by using the controller according to the first temperature, the second temperature and the third temperature. According tothe electric automobile thermal management system and the control method and device thereof, when one circuit of the motor circuit and the battery circuit has the fault, the four-way valve communicates with the other circuit to work so as to protect the circuit of the thermal management system and prolong the service life of an automobile. The electric automobile thermal management system and thecontrol method and device thereof can be widely applied to the field of new energy automobiles.

The invention discloses a start protecting circuit of a low-voltage and high-power motor. The start protecting circuit comprises a microprocessing unit, a starting resistance control unit, a motor driving unit and a current detection unit, wherein the starting resistance control unit is used for limiting the starting current of a motor; the microprocessing unit is connected with the motor through the motor driving unit and controls the rotation speed of the motor by adjusting the duty ratio input by the motor driving unit; and the microprocessing unit controls the maximal current of a motor circuit according to a detection signal of the current detection unit. The start protecting circuit is a protecting circuit which combines the advantages of soft start and series resistance start and is quick in response and high in reliability.

The present invention provides an electric motor with a reduced number of windings on one of the coil windings. The effect of this is that when the motor is in operation, the current that flows through the coil with the reduced number of windings differs from the others, and this difference can be detected to allow accurate control of the motor. To avoid any mechanical imbalance caused by this difference in the number of windings, mechanical compensation means is provided on the arm with the reduced number of windings. Preferably this comprise a further winding that is not electrically connected to the motor circuit.