527results about "Ac motor stoppers" patented technology

An electric motor based system includes an electric motor; an electric motor power controller for controlling the electric motor; a first control unit, adapted to provide first control signals for the electric motor power controller; an electric power storage device adapted to power the electric motor power controller; a first sensor adapted to determine information related to power exchange between the electric power storage device and the electric motor power controller; and a second control unit, wherein the second control unit is adapted to pass the first control signals, received from the first control unit, to the electric motor power controller in a first mode and adapted to provide second control signals for the electric motor power controller in a second mode; and the second control unit inputs and exploits the information.

The utility model provides a mechanical arm power-down protection circuit and a sweeping robot, and relates to the technical field of motor control, the mechanical arm power-down protection circuit comprises a power supply module, a micro-control module, a relay and a mechanical arm control module, when the power supply module supplies power, a control end of the relay is electrified to control a common end to be conducted with a second connecting end, and the mechanical arm control module controls the micro-control module. The micro-control module controls the power supply module to be connected with the input end of the motor. When the power supply module is powered off, the control end of the relay is powered off, the common end is connected with the first connecting end, the input end of the motor is connected with the grounding end, and a coil of the motor forms loop current and generates resistance to slow down descending of the mechanical arm. By means of the automatic switching function of the relay, the connection state of the motor is rapidly switched when a power source is cut off, resistance is generated through the physical characteristics of the motor so as to slow down descending of the mechanical arm, the circuit structure is simple, cost is low, large installation space does not need to be occupied, and the circuit can be applied to mechanical arms of various sizes and models; and the method has a relatively wide application range.

A motor drive control device includes: a first input unit to which first current from the power source to the control unit is input; a first output unit that outputs the first current input from the first input unit to the control unit; a shutoff unit that is provided between the first input unit and the first output unit, and switches an output state of the first output unit; a second input unit to which second current from the control unit to the motor is input; a second output unit that outputs the second current input from the second input unit to the motor; and an arithmetic unit that is provided between the second input unit and the second output unit, and calculates a rotation speed of the motor.

The invention provides a braking rotating device with a power generation function, a self-powered rotating system, a control method and a wire cup, and the braking rotating device comprises a stator part which comprises three groups of coils arranged at intervals in the circumferential direction; the rotor part rotates coaxially with the stator part and comprises a plurality of magnets which are arranged at intervals in the circumferential direction and have alternately changed polarities; the self-power-generation brake part generates power based on rotation of the rotor part relative to the stator part and performs brake control on the rotor part based on a received brake signal, the self-power-generation brake part comprises a three-phase rectifier bridge circuit, and three phase current ends of the three-phase rectifier bridge circuit are respectively connected with the three groups of coils; at least one phase of the three-phase rectifier bridge circuit is provided with a switching device, at least one phase of the three-phase rectifier bridge circuit is not provided with a switching device, and when an enabling end of the switching device receives a brake signal, a phase current end of the phase where the switching device is located and a common anode or a common cathode of the three-phase rectifier bridge circuit are conducted.

The electro-mechanical actuator of a wind turbine is configured to be powered from a DC link intermediate circuit. A method for controlling the actuator includes: determining whether a voltage demand and a power demand for operating the electro-mechanical actuator at a specific operating point can be met by an output of a first converter. The first converter is connected to a supply grid and configured to provide a first voltage and a first power to the DC link intermediate circuit; and, when the voltage demand and the power demand cannot be met, triggering a boost mode of a second converter connected between the DC link intermediate circuit and an energy store. The boost mode is triggered to: boost the voltage at the DC link intermediate circuit to a second voltage; and, boost the power supply to the electro-mechanical actuator via the DC link intermediate circuit to a second power.

Vehicle drive inverter (I) with a DC voltage connection (GA), an AC voltage connection (WA) and a three-phase bridge (B1 - B3) via which these connections (GA, WA) are connected to one another, wherein the vehicle drive inverter (I) has a phase short-circuit circuit (PKS) and a controller (X) which is connected to the phase short-circuit circuit (PKS) and to the three-phase bridge (B1 - B3) in a driving mode, wherein the controller (X) is configured to temporarily control the three-phase bridge (B1 - B3) to generate a phase short circuit and to control the phase short-circuit circuit (PKS) to generate a phase short circuit, while the controller (X) simultaneously controls the three-phase bridge (B1 - B3) to generate the phase short circuit, wherein phases (P1 - P3) of the AC voltage connection (WA) are connected to one another via the phase short-circuit circuit (PKS).

The invention provides an active short circuit control method and device, a vehicle, a medium and a program product, and relates to the technical field of motor control. The method comprises the following steps: under the condition that the motor controller system needs to execute an active short circuit strategy, obtaining thermal damage evaluation values respectively corresponding to a plurality of execution paths contained in a level inverter in the motor controller system; dynamically determining an execution path meeting a thermal damage risk condition as a target execution path of the active short circuit strategy in the plurality of execution paths according to each thermal damage evaluation value; and controlling the level inverter to execute the active short circuit strategy on the target execution path. According to the method, the thermal damage evaluation values corresponding to the multiple execution paths are acquired in real time, and the target execution path of the active short circuit strategy is dynamically determined based on the thermal damage evaluation values corresponding to the multiple execution paths, so that the thermal damage of the power device caused by executing the active short circuit strategy for a long time by a single execution path is reduced; therefore, the thermal damage risk of each power device is obviously reduced.

The invention provides a mechanical arm power-down protection circuit and a sweeping robot, and relates to the technical field of motor control, the mechanical arm power-down protection circuit comprises a power supply module, a micro-control module, a relay and a mechanical arm control module, when the power supply module supplies power, a control end of the relay is electrified to control a common end to be conducted with a second connecting end, and the mechanical arm control module controls the micro-control module; the micro-control module controls the power supply module to be connected with the input end of the motor. When the power supply module is powered off, the control end of the relay is powered off, the common end is connected with the first connecting end, the input end of the motor is connected with the grounding end, and a coil of the motor forms loop current and generates resistance to slow down descending of the mechanical arm. By means of the automatic switching function of the relay, the connection state of the motor is rapidly switched when a power source is cut off, resistance is generated through the physical characteristics of the motor so as to slow down descending of the mechanical arm, the circuit structure is simple, cost is low, large installation space does not need to be occupied, and the circuit can be applied to mechanical arms of various sizes and models; and the method has a relatively wide application range.

The disclosure is directed to a brake chopper, a control board, a bus voltage control method, a device and a medium. The brake chopper may include a resistor module, electrically connected to a DC bus to form an energy release circuit of the DC bus; a control module, for determining the difference between a voltage value of the DC bus and a preset first threshold, and generating a first switch control signal on the basis of the difference; and a switch module, for controlling the ON time of the energy release circuit on the basis of the first switch control signal. There may be a progressively increasing relationship between the ON time and the difference. The ON time of the energy release circuit may be precisely controlled based on the difference between 10 the DC bus voltage value and the first threshold, increasing the energy utilization rate of the DC bus.

The invention provides an energy recovery system, a control method thereof and electronic equipment, and belongs to the technical field of energy recovery. The energy recovery system is applied to an offshore wind power installation vessel and comprises a main distribution board direct current bus, a voltage detection module, a lifting system, a battery energy storage system, a brake unit and a control system. Wherein the control system can control charging of the battery energy storage system and / or control starting and stopping of the braking unit according to the direct-current bus voltage, collected by the voltage detection module, of the main distribution board and the battery charge state of the battery energy storage system. In other words, the control system can recover and consume energy generated in the operation process of the lifting system by controlling the battery energy storage system and / or the brake unit, the situation that the voltage of a direct-current bus of a main distribution board is increased due to regenerated energy, and consequently electric equipment is damaged is avoided, and the stability and safety of the lifting system are improved.

The present invention relates to a resistor unit (1, 1', 1''), comprising: at least one electrical resistor (10), at least one fluid-carrying cooling unit (30) on and / or in which at least part of the at least one electrical resistor (10) is arranged, at least one detection unit (3, 4, 5, 6, 7, 71, 72) and at least one evaluation device (40) that can be operatively connected to the at least one detection unit (3, 4, 5, 6, 7, 71, 72), the at least one detection unit (3, 4, 5, 6, 7, 71, 72) being configured to measure a variable that represents the temperature (TR) of the at least one electrical resistor (10) per se or in combination with a further detection unit (3, 4, 5, 6, 7, 71, 72) and that relates to an electrical property of the at least one electrical resistor (10) and / or to a property of a fluid flowing through the fluid-carrying cooling unit (30). The present invention additionally relates to a brake system and to a vehicle having such a resistor unit and to a method for estimating a temperature of the fluid-cooled electrical resistor.

The utility model provides a frequency converter system and a dynamic braking module. The frequency converter system comprises a frequency converter, a motor and an energy consumption braking module. The motor is connected to the output end of the frequency converter. The energy consumption braking module is connected between the output end of the frequency converter and the motor. The energy consumption braking module comprises a braking resistor and a braking switch connected with the braking resistor in parallel, and the braking switch can be switched on or switched off to stop or start energy consumption braking of the braking resistor. According to the frequency converter system, a hardware structure in the frequency converter does not need to be changed, the frequency converter without the energy consumption braking function can have the energy consumption braking function by externally connecting the energy consumption braking module, in other words, the rapid shutdown and rapid speed reduction capacity is achieved, the universality is high, the effect is good, implementation is convenient, manpower, time and hardware cost can be saved, and the practicability is high. The motor is not damaged, and the safety and high reliability of a frequency converter system can be guaranteed.

A motor control device includes a torque command calculation unit that calculates a torque command value, a current command calculation unit that calculates a current command value, a power converter, and a stop position adjuster. The stop position adjuster executes a stop position adjustment process that adjusts the rotation stop position within a specified position adjustment range when a lock current is applied while the rotation of the multiphase motor is stopped, except in cases where specified exemption requirement is met. In the stop position adjustment process, the stop position adjuster adjusts the rotation stop position so as to bias the current to one or more high heat dissipation phases having a relatively high heat dissipation property among the phases. The torque command calculation unit or the current command calculation unit calculates a torque command value or a current command value reflecting an adjusted rotation stop position.

Systems, method, and computer readable medium are provided for a controller for a generator. The system includes a rectifier for converting a first AC signal generated by the generator to a first DC signal; a first DC-DC associated with energy storage and a first mode; a second DC-DC associated with an inverter and a second mode; a switch for alternately toggling between the first DC-DC and the second DC-DC, wherein the first mode prevents output to the electrical grid, and the second mode enables inversion of the second DC signal to a second AC signal via the inverter; and a processor that uses the indicator to operate the switch to operate the generator in the first mode when a connection to the grid does not conform with a parameter, and operate the generator in the second mode when the connection to the grid conforms with the parameter.

A motor control device includes a torque command calculation unit that calculates a torque command value, a current command calculation unit that calculates a current command value, a power converter, and a stop position adjuster. The stop position adjuster executes a stop position adjustment process that adjusts the rotation stop position within a specified position adjustment range when a lock current is applied while the rotation of the multiphase motor is stopped, except in cases where specified exemption requirement is met. In a stop position adjustment process, the stop position adjuster adjusts the rotation stop position so as to reduce a current absolute value of a maximum current phase having a maximum current absolute value among the phases. The torque command calculation unit or the current command calculation unit calculates a torque command value or a current command value reflecting an adjusted rotation stop position.

The invention relates to a motor control circuit, method and module, a storage medium, a controller and a vehicle, and the motor control circuit comprises a detection circuit and a protection circuit. The detection circuit is used for detecting a detection parameter generated by the counter electromotive force generated by the motor; and the protection circuit is used for disconnecting the motor and the motor driving circuit when the detection parameter meets a first condition, so as to at least partially solve the problem that the ASC scheme cannot be directly executed, and the bus capacitor and the battery pack are reversely charged by overhigh counter electromotive force through the fly-wheel diode of the switching tube.

One aspect of the present disclosure provides an electric work machine including a brushless motor, a drive circuit, and a control circuit. The control circuit executes a driving operation, a braking operation, and a switching operation. In the driving operation, the brushless motor is rotated based on a back-EMF of the brushless motor. In the braking operation, a switch pair of six switches in the drive circuit is turned on, and the other four switches are turned off. The switching operation is performed during the braking operation. The switching operation includes switching the switch pair. In the switching operation, an off-target switch is turned off based on an electric current flowing through the off-target switch satisfying an off-requirement.

The invention discloses a control method and device of a braking device and the braking device, which are used for reducing the cost of a braking assembly of a multi-level inverter. The braking device comprises a first braking assembly, a second braking assembly and at least one third braking assembly. The first brake assembly, the at least one third brake assembly and the second brake assembly are connected in series; the first brake assembly is connected with a first bus capacitor in the inverter in parallel, the second brake assembly is connected with the last bus capacitor in the inverter in parallel, and each third brake assembly is connected with two bus capacitors in the inverter in parallel; the first brake assembly and the second brake assembly comprise bridge arms, the upper bridge arm of the first brake assembly and the lower bridge arm of the second brake assembly are diodes, and the diodes are connected with a brake resistor in parallel; each third brake assembly comprises a first bridge arm and a second bridge arm which are connected in series, a lower bridge arm of the first bridge arm and an upper bridge arm of the second bridge arm are diodes, and at least one brake resistor is connected between the lower bridge arm of the first bridge arm and the upper bridge arm of the second bridge arm in parallel.

The invention relates to a device for transferring the drive of a vehicle into a safe operating state, wherein the drive comprises an electric machine, in particular a synchronous machine, which is operated with electrical energy from an electrical energy store via an intermediate circuit and an inverter. The device is designed to determine, on the basis of an intermediate circuit voltage of the intermediate circuit, that a transfer procedure is to be carried out in order to transfer the drive into the safe operating state and, in response thereto, to bring about a freewheeling operation of the inverter in a freewheeling phase of the transfer procedure. The device is also designed to determine, on the basis of the intermediate circuit voltage, that the freewheeling operation of the inverter is to be ended and, in response thereto, to bring about a short-circuit operation of the inverter in a short-circuit phase of the transfer procedure, which short-circuit phase follows the freewheeling phase.

drive comprising an electric motor supplied by an inverter (6), wherein the converter (6) has an inverter (12) which has a DC-side connection and an AC-side connection, where a series circuit is supplied from the DC-side connection and the motor is supplied from the AC-side connection, wherein the series circuit has a resistance and a controllable semiconductor switch (11) for controlling the current flowing through the series circuit, wherein the voltage available at the DC-side connection of the inverter (12) is detected, characterized by the fact that - a comparator is set up in such a way and is operatively connected to a controllable semiconductor switch (11) such that an output signal of the comparator controls the controllable semiconductor switch (11), wherein the comparator is set up and is in operative connection with a utilization determination device (21) such that the output signal is also supplied to the utilization determination device (21) and the utilization determination device (21) determines a signal value from it, - the resistance has a braking resistance (1), - the comparator is set up in such a way that it monitors the recorded voltage value for exceeding a first threshold and falling below a second threshold, - the utilization determination device (21) has a counter whose counting direction depends on the value of the detected voltage and / or on the control signal (4) provided for the controllable semiconductor switch (11), - the utilization determination device (21) is set up such that a respective counting speed is provided during downward counting depending on the signal value.

An elevator drive configured to control power to an elevator motor includes a plurality of first (upper) inverter switches and a plurality of second (lower) inverter switches. A processor is configured to provide control signals to control operation of the inverter switches. A first signal buffer between the processor and the inverter switches is configured to selectively prevent any control signals from turning on any of the inverter switches when the motor should not receive power. A second signal buffer between the processor and the inverter switches is configured to selectively bypass the first signal buffer, prevent any control signals from turning on the first inverter switches, and allow a control signal from the processor to turn on the second inverter switches to provide motor braking.

A rapid detection and automatic release control system for cloth twining on a roller and a dyeing machine thereof relate to the technical field of dyeing machines, overcome the defects that a traditional dyeing machine lifting system is controlled by a frequency converter, and comprise a lifting roller, a servo motor and a servo driver, the servo motor is a non-band-type brake servo motor and is in transmission connection with the lifting roller through a synchronous belt; the servo driver is connected with and controls the speed of the servo motor, and the servo driver further comprises a brake resistor which enables a rotor of the servo motor to generate reverse electromagnetic brake torque and controls the free rotation speed of the rotor of the servo motor. The system can effectively reduce accidents that the fabric is tangled in the roller, reduce fabric wiping marks and improve the fabric quality, and after the system is introduced, a mechanical tangling detection device can be omitted, the machine design can be simplified, the machine cost can be effectively reduced, and the competitiveness is improved.

A power generation system (100) includes a rotating body (1), a generator (3), a brake circuit (4), a voltage sensor (VS), and a control device (5). When rotation speed of the rotating body (1) exceeds a first threshold (L), the control device (5) executes a brake operation by the brake circuit (4). When a release condition determined based on at least one of a value of a generated voltage detected by the voltage sensor (VS) and the rotation speed of the rotating body (1) is satisfied after the rotation speed of the rotating body (1) is lower than the first threshold (L), the control device (5) stops the brake operation by the brake circuit (4).

To provide an axial gap type rotating electric machine that can be miniaturized and thinned while maintaining performance, and can be manufactured at low cost. [Solution] An axial gap type rotating electric machine having a rotor with a disc-shaped permanent magnet and a pair of stators facing the rotor on both sides in the axial direction via an air gap, wherein the pair of stators have winding poles facing each other at the same position in the circumferential direction that are excited with the same polarity, and the disc-shaped permanent magnet has the same polarity at the same position in the circumferential direction on both sides, and the N pole and S pole are alternately magnetized to P pole in the circumferential direction.

A sawing tool includes a motor; a battery pack supplying power to the motor; and a control circuit for controlling the motor to rotate or brake. The control circuit includes a driver circuit including multiple high-side switching elements and multiple low-side switching elements; and a controller electrically connected to at least the driver circuit and outputting a control signal to control the states of the multiple high-side switching elements and the multiple low-side switching elements. The controller is configured to: in response to a brake signal, control the driver circuit to operate in an energy feedback state and adjust the duty cycle of the control signal to adjust the magnitude of the feedback current in the energy feedback state. The energy feedback state includes a brake mode and a freewheeling mode; and the feedback current generated in the freewheeling mode is fed back to the battery pack.

A startup control circuit includes a direct current (DC) conversion circuit, a main control unit, a first switch circuit and a second switch circuit. The first switch circuit is connected to the battery pack and the DC conversion circuit. The second switch circuit is connected to a battery pack, the DC conversion circuit, and a main control unit. The first switch circuit is configured to activate the DC conversion circuit to supply power to the second switch circuit and the main control unit after the first switch circuit is triggered. The second switch circuit outputs different voltage waveforms based on different timing sequences of currents flowing from the battery pack and the DC conversion circuit to the second switch circuit. The main control unit is configured to output a first drive command when receiving a first voltage waveform.

A startup control circuit includes a direct current (DC) conversion circuit, a main control unit, a first switch circuit and a second switch circuit. The first switch circuit is connected to the battery pack and the DC conversion circuit. The second switch circuit is connected to a battery pack, the DC conversion circuit, and a main control unit. The first switch circuit is configured to activate the DC conversion circuit to supply power to the second switch circuit and the main control unit after the first switch circuit is triggered. The second switch circuit outputs different voltage waveforms based on different timing sequences of currents flowing from the battery pack and the DC conversion circuit to the second switch circuit. The main control unit is configured to output a first drive command when receiving a first voltage waveform.

Power conversion device comprising: a circuit board (20) on which a plurality of semiconductor elements forming a power conversion circuit are mounted; a main body housing (10) accommodating the circuit board (20); a mounting unit of an input connector (31) that supplies power to the power conversion circuit, and a mounting unit (32a) of an output connector (32) that outputs power converted in the power conversion circuit, the mounting units being provided on a bottom surface (10c) or a top surface of the main body housing (10); a recessed portion (11) formed on a front surface (10a) or a side surface of the main body case (10), wherein a mounting unit (33a) of an auxiliary connector for the output (33) connected in parallel to the connector for the output (32) to the power conversion circuit is provided; and a double-sided mounting type wiring board (30) electrically connected to the circuit board (20), having one mounting surface (30b) on which the mounting unit of the input connector (31) or the mounting unit (32a) of the output connector (32) is mounted, and the other mounting surface (30a) on which the mounting unit (33a) of the auxiliary output connector (33) is arranged, and which is arranged in the main body housing (10) in a position where the other mounting surface (30a) is arranged parallel to the front side (10a) of the main body housing (10).

The invention relates to an aircraft system for suppressing movement of a structural flight element. The aircraft system includes a movable aircraft structure, a power source, a controller, a resistor, and a first transistor connected in series to the resistor. When the power source of the aircraft provides power, the controller controls the first transistor to prevent current from flowing through a terminal of the first transistor and through the resistor. Further, when the power supply of the aircraft does not provide power, the first transistor allows a current generated by a back electromotive force (EMF) voltage generated by movement of the movable aircraft structure to flow through a terminal of the first transistor and through the resistor.