359results about "Ac motor stoppers" patented technology

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 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 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.

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.

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.

To reduce vibration caused by switching energization to a coil.SOLUTION: A drive control device 1 includes: a rotational speed calculation unit 42 that calculates a rotational speed of a motor 20 on the basis of a rotational position detection signal of the motor 20; an energization stop time calculation unit 43 that calculates an energization stop time for stopping energization to all phases of coils Lu, Lv, and Lw of the motor 20 on the basis of a target rotational speed Stg and the rotational speed of the motor 20; and an energization signal generation unit 44 that switches the energization to the coils Lu, Lv, and Lw of the motor 20, and generates an energization signal for controlling the energization of the coils Lu, Lv, and Lw of the motor 20 in order to stop the energization of all the coils Lu, Lv, and Lw of the motor 20 during the energization stop time.SELECTED DRAWING: Figure 1

The embodiment of the application provides a controller for controlling a fan, comprising a rectifier unit, a switching power supply conversion unit, a delay unit, a fan starting control unit and a fan interface; the output end of the rectifier unit is connected with the input end of the switching power supply conversion unit, the switching power supply conversion unit converts the bus voltage output by the rectifier unit to generate the first direct current voltage required by the delay unit; the switching power supply conversion unit has an overvoltage protection function; the delay unit is connected to the first output end of the switching power supply conversion unit and receives the first direct current voltage; the fan starting control unit comprises a controllable switch, the control end of the controllable switch is connected with the delay unit, when the delay time set by the delay unit is reached, the delay unit controls the controllable switch to be closed; the first end of the controllable switch is connected with the output of the rectifier unit, and the second end of the controllable switch is connected with the fan interface. The controller can realize overvoltage protection of the fan.

To provide a fastening tool capable of restraining or preventing dispersion of a stop position when a driving mechanism stops.SOLUTION: The fastening tool includes a motor having a motor shaft, a housing, a pin-gripping part, a driving mechanism connected to the pin-gripping part and configured to perform rearward movement and forward movement, a position acquisition part configured to acquire a relative position of the driving mechanism, and a motor control part configured to switch a moving direction and a moving speed of the driving mechanism. The motor control unit starts forward movement of the shaft such that the movement speed becomes a first speed, decelerates the movement speed to a second speed slower than the first speed by PWM control for changing a duty ratio output to the motor when the acquired relative position reaches a deceleration position behind the initial position in the forward movement, and stops driving of the motor when the acquired relative position reaches a predetermined braking position in front of the deceleration position and behind the initial position.SELECTED DRAWING: Figure 11

Provided are a method and a device for controlling a braking device, and a braking device, with which cost of a braking component of a multi-level inverter is reduced. The braking device includes a first braking component, a second braking component, and at least one third braking component. The first braking component, the at least one third braking component and the second braking component are connected in series. The first braking component is connected in parallel to a first bus capacitor in the inverter, the second braking component is connected in parallel to the last bus capacitor in the inverter, and each third braking component is connected in parallel to two bus capacitors in the inverter. The first braking component and the second braking component include a bridge arm. An upper bridge arm of the first braking component is a diode, a lower bridge arm of the second braking component is a diode, and braking resistors are connected in parallel to the diodes. Each third braking component includes a first bridge arm and a second bridge arm connected in series. A lower bridge arm of the first bridge arm is a diode, an upper bridge arm of the second bridge arm is a diode, and at least one braking resistor is connected in parallel between the lower bridge arm of the first bridge arm and the upper bridge arm of the second bridge arm.

The invention provides a motor operation management system, and the system comprises the steps: converting an AC power supply into a target DC power supply after a switching power supply is started, and inputting the target DC power supply into a control case, so as to supply power to the control case; when the target direct-current power supply exceeds a preset voltage upper limit value, the energy release module releases the target direct-current power supply output by the switching power supply; when the actual motion trail of the target motor exceeds a given error window, the control case cuts off power supply driving of the target motor through the driving output switch and connects the braking module to the target motor, so that a three-phase winding of the target motor is short-circuited, and the target motor is stopped through acting force which is generated by short circuit and is opposite to the motion direction of the motor. According to the invention, energy release is started when the output of the switching power supply exceeds the expectation, the disturbance of motor motion to the voltage of the switching power supply can be effectively reduced, and the motor can be efficiently and rapidly stopped by performing three-phase short circuit on the motor in the out-of-control state of the motor.

A braking controller arrangement, a drive system, a vehicle, and a method of control. The braking controller arrangement includes a link circuit, a first semiconductor, a second semiconductor, a third semiconductor, a fourth semiconductor, and a resistor. The link circuit is electrically connected to terminals of a battery. The semiconductors are configured to be operated with a duty cycle of 50%.

This invention relates to a method for operating a modular brake regulator (1), wherein the modular brake regulator (1) has at least two brake regulator branches (15), each of which has at least one submodule (2) and a brake resistor (3); wherein the brake regulator branches (15) are arranged in a parallel circuit, and wherein at least two of the brake regulator branches (15) generate an alternating component (u) by means of the corresponding at least one submodule (2). BR,aDC voltage (u) BR ), wherein the alternating component (u) of each brake regulator branch (15) BR,aDC The phase offset between them, where n corresponds to the number of the braking regulator branches (15) that generate the voltage; where all alternating components (u BR,aDC The amplitudes are the same, and it is designed to convert the electrical energy absorbed by the modular brake regulator (1) over time into heat in the brake resistor (3). Furthermore, the invention relates to a control device (10) configured to perform such a method. The invention also relates to a modular brake regulator (1) having such a control device, and a modular drive unit (20) having a modular multilevel converter (21) and such a modular brake regulator (1).

To provide an energy conversion device and a safety control method for the same.SOLUTION: An energy conversion device includes a first switch module (10), a motor inverter (20) which has first and second bus terminals respectively connected to first and second terminals of a battery (70), and in which the first switch module (10) controls ON / OFF of the first bus terminal and the first terminal of the battery (70), or controls ON / OFF of the second bus terminal and the second terminal of the battery, or controls ON / OFF of the first bus terminal and the first terminal of the battery (70) and ON / OFF of the second bus terminal and the second terminal of the battery, a motor winding (30) having a first terminal connected to a midpoint terminal of the motor inverter (20), and a second switch module (40) and a first capacitor (50) which are connected in series, and a first terminal and a second terminal of which are connected to a second terminal of the motor winding (30) and the second bus terminal respectively after the series connection is established.SELECTED DRAWING: Figure 1

The present disclosure provides protection apparatus and methods for a driver. An example protection apparatus includes a meter, a loop unit, and a controller. The detection unit is configured to detect a current flowing through an inverter unit. The loop unit is configured to connect a positive terminal to a negative terminal of a DC bus or disconnect the positive terminal from the negative terminal of o the DC bus. The control unit is configured to, in response to power on of the driver, control the loop unit to connect the DC bus, and determine, based on a detection result of the detection unit, whether a three-phase AC power is connected to the three-phase motor wiring terminal, wherein in the case that a three-phase AC power is connected to the three-phase motor wiring terminal, the control unit stops.

A hand-held electrically powered cut-off tool (100) for cutting concrete and stone by a rotatable cutting disc (105), the cut-off tool (100) comprising an electric motor (130) arranged to be controlled by a control unit (110) via a motor control interface (120), wherein the control unit (110) is arranged to obtain data indicative of an angular velocity of the cutting disc (105), and to detect a kickback condition based on a decrease in angular velocity, wherein the control unit (110) is arranged to control an electromagnetic braking of the electric motor (130) in response to detecting a kickback condition, wherein the control unit (110) is arranged to determine an angular acceleration associated with the electric motor (130), and to detect the kickback condition based on a comparison between the determined angular acceleration and a configurable detection threshold.

A control system for a motor drive configured to supply energy from a battery to an electric motor (1), said motor drive (22) comprising a set of power switches and configured to convert a continuous voltage (Vdc1) into an alternating voltage, the invention relates to a control system (1) for controlling a power switch (2) of a motor and further configured to supply a reverse generated first DC voltage (Vdc2) to a battery when the motor is operating as a generator, the control system comprising:-a driver unit (5) for controlling the power switch by an active short circuit (ASC) function to place phases of the motor in a short circuit configuration; and-an input of the driver unit (5) for enabling an ASC function; -an independent auxiliary inverter (71) providing a signal representative of the back electromotive force of the motor, in which the signal provided by the auxiliary inverter can be processed and linked to the input of the driver unit for activating the ASC function.

The present invention relates to a method for measuring a damping function, preferably of a damper of an electromechanical actuator or drive system, and to an actuator or drive system with a control unit designed to carry out a method according to the invention.

This invention discloses a forward / reverse control module based on zero-crossing detection control, comprising a power supply circuit, an interlock delay circuit, a drive circuit, a switching circuit, a detection circuit, and a control unit. The drive circuit is connected in series between the interlock delay circuit and the switching circuit, and the switching circuit is connected in series between the load power supply and the winding terminals of the motor. The signal input terminal of the detection circuit is connected to the switching circuit. The control unit is connected to the interlock delay circuit to detect the presence of a forward rotation signal and / or a reverse rotation signal. The control unit is connected to the drive circuit through the detection circuit, and outputs a braking signal to the drive circuit. The drive circuit drives the corresponding switch in the switching circuit to conduct according to the braking signal, thereby realizing forward / reverse control and braking control of the motor. This invention combines forward / reverse control and braking functions without the need for additional braking components. It allows for adjustment of braking time and force, and features a simple braking structure, excellent performance, and high reliability.

An electric-powered road vehicle comprises two front wheels and two rear wheels; at least one battery; at least one electric machine configured to convert electrical energy to kinetic energy and vice versa. The electric machine is connected, on one side, to at least one battery and, on another side, to at least one of said wheels in such a way that during the running or acceleration of the vehicle, the electric machine converts incoming electrical energy arriving from the battery into kinetic energy to be transmitted to at least one of said wheels. At least one dissipative braking device converts the kinetic braking energy of at least one of said wheels into heat. A resistor device is connected to the electric machine and is configured to convert incoming electrical energy arriving from the electric machine into heat.