437results about "Dc motor stoppers" patented technology

A locomotive comprises a DC power bus, traction motors, batteries, and a charging source, but has no prime mover engine. Each traction motor includes armature and field windings connected in parallel across the DC power bus. The batteries provide power to the DC power bus when in a motoring mode, and receive power from the DC power bus when in a charging mode and a dynamic braking mode. The charging source is connected across the DC power bus to provide charging power to the batteries when in the charging mode. The traction motors also provide charging power to the batteries when in the dynamic braking mode. The power from the charging source is less than the power that would be provided by a prime mover engine. The charging source provides no power to the traction motors when in the charging mode.

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 power tool is provided including: a tool housing; a motor disposed within the tool housing; a battery receptacle arranged to be coupled to a battery pack having a rated capacity; a power switch circuit disposed between the battery receptacle and the motor; and a controller that controls the power switch circuit to drive the motor. The controller is configured to: determine or receive a pack ID associated with the rated capacity of the battery pack; set a braking profile for electronically braking the motor based on the pack ID; and apply an electronic brake to the motor in accordance with the set braking profile upon detection of an event associated with stoppage of the motor.

A power management system for an elevator system. A power management system for an elevator system includes a power converter having three input terminals, two of the three input terminals coupled to a main power source for supplying single-phase AC power to the power management system, the power converter configured to convert the AC power from the main power source into DC power on a common DC bus, a secondary power source for supplying DC power to the common DC bus, a power inverter configured to invert the DC power on the common DC bus into AC output power for driving an electric motor of the elevator system, and a dynamic braking resistor which is coupled between a third input terminal among the three input terminals of the three-phase power converter and the common DC bus.

The invention relates to the technical field of airborne photoelectric pod camera motor limiting protection, in particular to a circuit, a system and a method for an airborne photoelectric pod camera motor limiting system. The circuit for the airborne photoelectric pod camera motor limiting system comprises a main controller; the normal-phase AND gate unit is connected with the normal-phase PWM output end of the main controller and the output end of the normal-phase Hall unit; the inverted AND gate unit is connected with the inverted PWM output end of the main controller and the output end of the inverted Hall unit; the decoding unit is connected with the output end of the normal phase AND gate unit and the output end of the reverse phase AND gate unit; and the direct current motor driving unit is connected with two output ends of the decoding unit. According to the technical scheme, electric limiting protection can be carried out on the motor in the downtime state of the main controller, so that the motion part of the motor is braked at the electric limiting position, and collision damage caused by the motor is prevented.

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.

A locomotive comprises a DC power bus, traction motors, batteries, and a charging source, but has no prime mover engine. Each traction motor includes armature and field windings connected in parallel across the DC power bus. The batteries provide power to the DC power bus when in a motoring mode, and receive power from the DC power bus when in a charging mode and a dynamic braking mode. The charging source is connected across the DC power bus to provide charging power to the batteries when in the charging mode. The traction motors also provide charging power to the batteries when in the dynamic braking mode. The power from the charging source is less than the power that would be provided by a prime mover engine. The charging source provides no power to the traction motors when in the charging mode.

The application discloses a construction hoist brake holding control system and belongs to the technical field of intelligent control, which comprises a 380V power supply, an LLC resonant converter, a brake holding control circuit, an LLC control circuit and an MCU control circuit, wherein the LLC resonant converter comprises an EMC circuit, a front-stage rectification filter circuit, an LLC resonant circuit and a full-bridge rectification filter circuit. The main topology scheme adopted by the application is an LLC resonant converter plus double-path IGBT control plus output voltage and current detection scheme. The LLC converts the alternating voltage of 380V into the direct voltage of 195V+ / -15V, and then the voltage is output to the brake holding for power supply through the control of IGBT. Voltage detection and current detection circuits are added in the whole output loop. In the working process, the MCU can monitor the brake holding logic, detect the output voltage and current, and judge whether the brake holding has faults such as short circuit, open circuit, overload, overcurrent, overvoltage, undervoltage, unstable output voltage, IGBT through and the like.

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.

Aspects of the present disclosure relate to systems and method for enhancing energy recovery, efficiency, and continuous operation in electric motors. The integration of auxiliary windings in the electric motor of the present disclosure enables the continuous capture and conversion of otherwise lost energy into electrical energy, which is then fed back into at least one of one or more batteries of the electric vehicle and the electric motor and / or the energy is used to power one or more auxiliary systems of the electric vehicle, using an energy management unit. The processes are managed by intelligent control systems that dynamically adjust the rate and amount of energy feedback based on real-time battery status and operating conditions of the electric motor.

An electronic device is provided. The electronic device includes memory that stores instructions, a first housing, a second housing that overlaps a portion of the first housing, a flexible display partially mounted on the surface of the second housing and collapsible or expandable, a motor that drives the second housing to move in a direction relative to the first housing, a drive circuit that controls driving of the motor; and a processor, wherein the instructions when executed by the processor, cause the electronic device to, upon receiving a trigger signal, transmit, to the drive circuit, a first motor drive signal, transmit, to the drive circuit, a second drive signal for abnormally stopping the driving of the motor, and select and execute at least one from among at least one recovery control specified based on the accumulated number of abnormal stops.

The present application belongs to the technical field of brake mechanisms. Provided are a direct-current buck circuit, a brake mechanism, and an electric motor. The direct-current buck circuit comprises an input circuit, an energy storage inductor and an output circuit, wherein the input circuit, the energy storage inductor and the output circuit are electrically connected in sequence; the input circuit is used for connecting to a power source; the energy storage inductor is used for performing opening and closing control over a brake-shoe brake by means of a magnetic field; and the output circuit is used for connecting to a load. By using the solution, an energy storage inductor in a direct-current buck circuit can replace a brake coil which is connected to a load end of a direct-current buck circuit in the prior art, that is, it is not necessary to provide a brake coil in a brake mechanism, which is conducive to reducing the cost of the brake mechanism and improving the working stability.

As first aspect provides, in an electronic control circuit, a method of controlling an electromotor of an actuator for controlling a position of an actuatable object of a vehicle. The method comprises receiving an instruction to hold position of the actuatable object, obtaining an initial hold voltage pattern for the electromotor and applying the initial hold voltage pattern to the electromotor. The method further comprises determining movement data on movement of the actuatable object, determining an adjusted hold voltage pattern based on the movement data and applying the adjusted hold voltage pattern to the electromotor. By applying a particular voltage to the electromotor—stator, rotor or both, depending on the type—, a magnetic force between rotor and stator may be created to counteract any external force. The voltage applied for holding the stator is determined on detection of any movement of the rotor.

Power tools that include a housing, a motor supported by the housing, a battery pack interface configured to receive a battery pack that includes a plurality of battery cells, an inverter positioned between and electrically connected to the battery pack interface and the motor, a gate driver connected to the inverter and configured to control a current in the inverter, a controller configured to control the gate driver, and a short circuit detection circuit. The short circuit detection circuit is configured to monitor the current in the inverter, compare the current in the inverter to a short circuit threshold, and control a switch of the short circuit detection circuit to disable the gate driver when the current in the inverter is greater than or equal to the short circuit threshold.

A method of discharging electrical power can include rotating a fan with an electric motor to provide kinetic energy (204' 204'), opening a disconnect switch to disconnect an electrical power source from the electric motor (206; 206' or 206"), generating electrical power by rotating the electric motor using the kinetic energy (208; 208'), providing electrical power generated by the electric motor to a microcontroller (212; 212'), bringing the fan to a controlled stop (216; 216'), and dissipating electrical power from an inverter power module connected to the electric motor through the electric motor as heat (218; 218'). Also disclosed is a high voltage system discharge apparatus, as well as a vehicle (50) including the same.

The invention belongs to the technical field of vehicle braking, and particularly relates to a control method and system for a vehicle slope rushing braking current, and the method comprises the steps: when an electric forklift is in a slope rushing braking state, controlling a motor current to reach a first braking current, and obtaining a rising slope of the motor current in a first time period; performing multiple tests under different gradients, collecting test data to establish a first mathematical model, determining a first relationship between the rising slope and the voltage, and calculating a voltage falling control curve under a specific slope based on the first relationship; after the output voltage of the motor controller is zero, the current at zero voltage is obtained, a compensation current control curve is determined, and voltage output is adjusted to reach compensation current; and when the compensation current is reached, the motor controller also predicts the rotating speed of the motor, and when the rotating speed of the motor is reduced to zero, the motor controller closes the electromagnetic brake and stops the current control, so that the slope rushing braking process is completed. According to the invention, safe break-through braking and a current limiting function can be realized.

A drive arrangement of a conditioning apparatus of a forage harvester having two conditioning rollers, with at least one of the conditioning rollers able to be driven at variable speed via an electrical drive train, includes an electric motor / generator for driving the conditioning roller. The electric motor / generator is able to be operated as a generator for braking the conditioning roller and to return the generated electrical energy into a drive system of the forage harvester.

A power storage system has a battery, a three-phase motor in which coils of three phases are connected at a neutral point, an inverter connected on an electric power transmission path between the battery and the three-phase motor, and a DC power supply circuit connected to a connection portion positioned on an electric power transmission path between the inverter and the battery. The battery includes two power storages and a switch unit that switches between a first voltage state where the two power storages are connected in series and chargeable at a first voltage, and a second voltage state where the two power storages are connected in parallel and chargeable at a second voltage. The DC power supply circuit has a branch circuit connected to a coil of any one phase among the coils of three phases at a positive electrode side of the DC power supply circuit.

To provide a binding system capable of preventing regenerative current from flowing from a binding machine to a power supply unit.SOLUTION: A binding system 100 comprises a steel bar binding machine 1A that binds steel bars, a power supply unit 200 that supplies electricity to the steel bar binding machine 1A, and a reverse current prevention unit 300 that prevents regenerative current from flowing from the steel bar binding machine 1A to the power supply unit 200. The steel bar binding machine 1A comprises a motor 110 driven by electricity supplied from the power supply unit 200, and a drive unit 111 capable of performing at least reverse braking, which switches the positive and negative current flowing to the motor 110 and applies a current that reverses a direction of rotation of the motor 110.SELECTED DRAWING: Figure 1A

The utility model discloses an electronic brake circuit for an electric chain saw, which comprises a power supply module, an MCU (Microprogrammed Control Unit) control module, a voltage detection module, a driving module, a front trigger switch S1 and a rear trigger switch S2, the front trigger switch S1 is electrically connected with the input end of the voltage detection module, the rear trigger switch S2 is electrically connected with a battery pack, and the front trigger switch S1 and the rear trigger switch S2 are connected in series; the voltage detection module is used for detecting voltage information of the whole electric chain saw, converting the voltage information of the whole electric chain saw into a VAD signal and transmitting the VAD signal to the MCU control module, the MCU control module is used for comparing the received VAD signal with a preset value in the MCU control module and sending feedback information to the driving module, and the driving module is used for controlling a circuit of the whole electric chain saw to be connected or disconnected. By means of the structure, on one hand, identification and fixation of the switching sequence are achieved, a mechanical interlocking structure does not need to be added, production efficiency is improved, on the other hand, the electronic brake function is achieved, and use safety is further improved.

The invention relates to a method for absorbing energy in an electric drive system (1), in particular a drive system for operating an entry system or door system of a vehicle, the system comprising: an electric drive motor (M) for driving a drive body (2); and a motor control circuit (3) for controlling the drive of the drive motor (M). In said method: electric energy is supplied in a controlled manner to the drive motor (M) via the motor control circuit (3) in a driving operating mode and electric energy is absorbed by the drive motor (M) via the motor control circuit (3) in a braking operating mode; and optionally at least one part of the absorbed energy is converted into heat in a controlled manner by an ohmic resistor of the drive system (1) by injecting an alternating current into the drive system (1). The invention also relates to an electric drive system (1), in particular a drive system for operating an entry system or door system of a vehicle, which is controlled by means of such a method.

The utility model provides a power supply circuit and a driver, and relates to the technical field of drivers, and the power supply circuit comprises a conversion circuit which converts an AC voltage into a DC bus voltage; the braking circuit is connected with the output end of the conversion circuit, and when the braking circuit is connected to the output end of the conversion circuit, back electromotive force is released; the first detection circuit is connected with the output end of the conversion circuit and correspondingly outputs a first voltage detection signal; the second detection circuit is electrically connected with the braking circuit and correspondingly outputs a second voltage detection signal; the control circuit controls the brake circuit to start when the voltage value corresponding to the first voltage detection signal is larger than a first preset voltage value, and controls the conversion circuit to reduce the output power when the voltage value corresponding to the second voltage detection signal is larger than a second preset voltage value. The brake circuit can still operate safely when the brake resistor in the brake circuit is not correctly connected or the brake resistor is damaged due to frequent braking.

A locomotive has a power bus that provides power to components of the locomotive when operating in a motoring mode or a charging mode. A plurality of batteries, one or more traction motors, and a charging source are all connected to the power bus. The batteries are operable to provide power to the power bus when operating in the motoring mode, and to receive power from the power bus when operating in the charging mode. The traction motors are operable to receive power from the power bus when the locomotive is operating in the motoring mode. The charging source intermittently provides charging power to the power bus to charge the batteries when the locomotive is operating in the motoring mode or in the charging mode. The charging source is selectively activated and deactivated based at least in part on the state of charge of the batteries.

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.

An energy storage motor control circuit comprises a CPU control assembly, a relay assembly, an electronic switch assembly, a motor current detection assembly, a motor and a motor power supply. The CPU control assembly is connected with the relay assembly; the relay assembly is connected with the electronic switch assembly; the CPU control assembly is connected with the electronic switch assembly; the electronic switch assembly is connected with the motor current detection assembly; the motor current detection assembly is connected with the CPU control assembly; the motor current detection assembly is connected with the motor. The motor has two control modes, namely motor rotation and motor stop; the motor stopping comprises stopping of a direct current motor and stopping of an alternating current motor; when the direct current motor stops, the electronic switch assembly is used for controlling the turn-off of the direct current motor; when the alternating current motor stops, the electronic switch assembly is turned off firstly, and when the motor current detection assembly monitors that the current is zero, the relay assembly is controlled to be turned off.

The utility model provides a three-station motor control system. The three-station motor control system comprises a power supply module, a station detection module, a main control module, a first driving module, a second driving module and a man-machine interaction module, the power supply module is used for supplying power; the station detection module is used for detecting the station state of the three-station main switch and sending a station detection signal to the main control module; the main control module controls the corresponding action of the motor through the first driving module and controls the corresponding action of the electromagnetic brake through the second driving module according to the station detection signal; the motor is used for driving the three-station main switch to perform station switching; the electromagnetic brake is used for braking the motor; according to the utility model, the station state of the three-station main switch can be detected in real time, so that the main control module can control the motor and the electromagnetic brake to perform corresponding actions, and the station state of the three-station main switch can be displayed.

Aspects of the present disclosure relate to systems and methods for real-time adaptive control and continuous energy recovery in an electric motor. The electric motor includes a main winding and one or more auxiliary windings in a stator of the electric motor. The system includes an adaptive control unit configured to monitor in real-time, sensor data from a plurality of sensors. The adaptive control unit is further configured to adjust a voltage and / or current input to the electric motor based on real-time feedback, which is based on the sensor data, using a Proportional-Integral-Derivative (PID) controller. The real-time feedback is indicative of an error between a desired state of the electric motor and an actual state of the electric motor. The state of the electric motor is associated with an operating parameter of the electric 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%.

The invention relates to a method for de-exciting a rotor winding of a rotor of an electric machine (2) of a motor vehicle (1), the electric machine comprising a stator and a rotor mounted rotatably relative to the stator, the rotor having a rotor winding for generating a rotor magnetic field, an active rectifier being arranged on the rotor side, the rectifier comprises at least one field effect transistor which can be actuated by means of an actuation voltage, the rectifier electrically connects a voltage source present on the rotor side to the rotor winding, by means of which an alternating voltage provided by the voltage source can be converted into a direct voltage, the field effect transistor or at least one of the field effect transistors is brought into an operating state, in which the respective field effect transistor forms an ohmic resistance, by means of a control voltage, and the energy stored in the rotor winding causes a current to flow through the at least one field effect transistor forming the ohmic resistance, at least a portion of the energy is converted into thermal energy.