243results about "Dc motor stoppers" patented technology

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 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.

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.

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.

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.

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.

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.

A control circuit for realizing motor braking through two-wire lap joint belongs to the technical field of a goods channel motor control circuit of a food machine, and comprises an MCU control unit P1, an MCU control unit P2, a motor M01 and an SW-SPDT switch, one path of the MCU control unit P2 is connected with the MCU control unit P1, the other path of the MCU control unit P2 is connected with the MCU control unit P1 through the SW-SPDT switch, one path of the output of the MCU control unit P1 is connected with the positive electrode of the motor M01, and the other path of the MCU control unit P2 is connected with the negative electrode of the motor M01 through the SW-SPDT switch. And the other two output paths of the MCU control unit P1 are connected in parallel and then are connected with the negative electrode of the motor M01. The utility model ensures that the motor stops without delay after the power supply is cut off. A triode Q1 is additionally arranged, so that induced electromotive force generated by kinetic energy of the motor disappears. A diode D2, a diode D1 and a capacitor C1 are additionally arranged, so that the stability of circuit voltage is ensured, the stable operation of the motor M01 is protected, the stability of the circuit is improved, and the service life of the motor is prolonged.

The present invention discloses a series-excited motor control circuit and method, belonging to the field of motor control technology. The control circuit includes a control circuit, which includes a drive circuit and a brake circuit. The control circuit includes a power supply, a switch group, an armature, an excitation winding, and a brake resistor. The armature and excitation winding constitute a motor. The switch group includes switches KV1, KV2, KV3, KV4, KV5, and KV6. The armature includes terminals ZH1 and ZH2. The excitation winding includes terminals D3 and D4. The brake resistor includes terminals RX1 and RX2. The upper end of switch KV1 is connected to the upper end of switch KV2, and both are connected to the positive pole of the power supply. The present invention actively controls the rapid switching of the power tube conduction state during the braking phase, reversely connecting the excitation winding to the brake circuit, and forming energy-consuming braking. This reduces the impact of inertial shock caused by excessive motor speed and improves the stability of the entire control system.

To recover a regenerative current without requiring an additional component.SOLUTION: A method includes a first determination step (E1) of determining a d-axis current intermediate value Idstat and a q-axis current intermediate value Iqstat of an AC supply current of a motor, a second determination step (E2) of determining a d-axis current target value Idcible and a q-axis current target value Iqcible, and a drive step (EP) of driving the at least one inverter by a microcontroller on the basis of the d-axis current target value Idcible and the q-axis current target value Iqcible.SELECTED DRAWING: Figure 2

The invention provides a smooth deceleration shutdown control device and method for a sheath forming machine, and relates to the technical field of industrial automation control, the smooth deceleration shutdown control device comprises a main controller, a low-voltage direct-current motor, a multi-turn potentiometer and a transmission and overload protection assembly, the multi-turn potentiometer is connected with the low-voltage direct-current motor through a transmission assembly, and the transmission assembly is connected with the low-voltage direct-current motor. The signal output end of the microprocessor is connected to the main controller; the output end of the main controller is connected to a driver of an equipment main motor, during working, the main controller starts the low-voltage direct-current motor and drives the multi-turn potentiometer to rotate so as to generate a linearly changing resistance signal, the signal serves as a speed given value, and the main controller adjusts the output of the driver of the main motor in real time through a configured closed-loop control algorithm so as to control the speed of the equipment. According to the control method, the problems of sheath quality damage and mold jamming caused by sudden stop of the sheath forming machine are effectively solved, and the control method has the advantages of being accurate in control, high in reliability and high in adaptability.

The application discloses a single-power-supply double-input-end digital isolated brush motor servo driving device, and belongs to the technical field of motor driving. The device comprises a double-end input isolation control interface circuit, a control driving circuit, a power output H-bridge circuit, a current-limiting protection circuit and a system power supply circuit. The double-end input isolation control interface circuit is connected with a signal source. The system power supply circuit is connected with an external power supply. The system power supply circuit is connected with the double-end input isolation control interface circuit and the control driving circuit. The power output H-bridge circuit is electrically connected to the external power supply. The power output H-bridge circuit is connected with a direct-current brush motor. The double-end input isolation control interface circuit comprises an optical coupler O1 and an optical coupler O2, and outputs signals to the control driving circuit. The power output H-bridge circuit is controlled according to the output signals to drive the direct-current brush motor. The application has the effects of being capable of regulating and controlling various states of the motor through a simple circuit, low cost and small space occupation.

A heating, ventilation, air conditioning, and / or refrigeration (HVAC&R) system (10) includes a compressor (32) having a bearing (106). The HVAC&R system (10) also includes a pump (112) configured to supply a flow of pressurized fluid to the bearing (106). Additionally, the HVAC&R system (10) includes a main power supply (210) configured to supply power to the pump (112). Furthermore, the HVAC&R system (10) includes an uninterruptible power supply (218) configured to supply power to the pump (112) in response to an interruption in supply of power to the pump (112) via the main power supply (210).

The utility model discloses a novel control system for an AC voltage-stabilized power supply. The novel control system comprises a master control MCU module, a DC motor control circuit, a signal measurement circuit, a power conversion circuit, a man-machine interaction module, a communication module, a storage module and a protection module. The master control MCU module is connected with the signal measuring circuit, the man-machine interaction module, the communication module and the storage module through an SPI bus. The direct current motor control circuit adopts a full-bridge topological structure, is connected with the main control MCU module through an optical coupling isolator, and receives a PWM signal to control the positive and negative rotation and rapid braking of a motor; the power conversion circuit adopts a two-stage voltage reduction structure, the voltage of the first stage is reduced to 8V from + 12V, and the output of the second stage is 5V and 3.3 V. According to the utility model, a full-bridge topological structure and a + 12V single power supply are adopted for power supply, flexible forward rotation, reverse rotation and rapid braking control are realized, and the dynamic response capability of the system is improved.

This invention relates to the field of motor control technology and discloses a sensorless brushed DC motor control method. The method includes calculating the optimal tracking angle of the control panel and obtaining the current angle of the control panel; acquiring the current signal of the brushed DC motor through a ripple current conversion circuit, converting the current signal into a PWM pulse signal and inputting it to an MCU; the MCU counting the number of ripples per unit time and calculating the motor speed based on the number of ripples; controlling the brushed DC motor to start running based on the current angle and the optimal tracking angle of the control panel; during the operation of the brushed DC motor, calculating the optimal stopping angle based on the motor current and motor speed, while simultaneously acquiring the current angle of the control panel in real time, and controlling the brushed DC motor to stop running when the current angle of the control panel reaches the optimal stopping angle. The advantages of this invention are that it can achieve precise speed control of a brushed DC motor without sensors and effectively reduce implementation costs.

According to the embodiment of the invention, the action method of the pipeline moving device is provided, and the method comprises the following steps: obtaining the moving speed of a machine body part; determining whether braking is required for the fuselage part based on the speed; and setting, according to a result of the determination, an output state of a motor that rotates in conjunction with a guide wheel of the body, the output state including one of a load state in which a load is electrically connected to the motor and a non-load state in which the load is electrically separated from the motor.

The application discloses a clutching circuit, comprising: a control circuit, generating a releasing signal and a clutching signal; a first switch circuit, a control end of which is connected with the control circuit, a first communication end of which is connected with a first end of a clutching inductor of a motor, and a second communication end of which is connected with a second end of the clutching inductor; a second switch circuit, a control end of which is connected with the control circuit, a first communication end of which is connected with the second end of the clutching inductor, and a second communication end of which is grounded; and a one-way conducting circuit, a first end of which is connected with the first communication end of the second switch circuit, and a second end of which is connected with the first communication end of the first switch circuit; the two switch circuits are turned on under the control of the releasing signal, a releasing voltage is applied to both ends of the clutching inductor based on a first power supply voltage, and the releasing is realized; in the releasing state, the second switch circuit is turned off under the control of the clutching signal, a negative voltage of the releasing voltage is applied to both ends of the clutching inductor, and the clutching is realized. The application can improve the clutching response speed of the motor and improve the coasting phenomenon.

The present invention discloses a molecular pump stop braking method, which is based on a motor control system. The system includes a power module, a DC bus, a main controller, an inverter, a DC bus voltage sampling unit, and an energy release unit. The braking method includes: s1. Upon receiving a shutdown command, the system performs vector control braking and reduces the motor speed to a speed threshold; s2. The power module disconnects the power supply to the DC bus, and the system performs resistance braking. First, the highest-order energy release subunit is connected, and the back electromotive force generated on the DC bus is consumed by an energy-consuming resistor. When the back electromotive force on the DC bus drops to a voltage threshold, the energy release subunit of this order is disconnected and switched to the next-order energy release subunit. Thereafter, the system operates sequentially according to the above rules until the lowest-order energy release subunit is disconnected. A multi-modal braking method combining vector control braking and resistance braking is adopted, which can prevent the molecular pump rotor from losing stability and oscillation, and can also quickly complete braking.

Method for operating a vehicle electrical system (10, 50) comprising a first actuator and a second actuator, and the first actuator and the second actuator are connected to each other via a common control unit, wherein energy fed back from the first actuator is transferred via the common control unit to the second actuator and is at least partially consumed in it.

The invention relates to a method for operating an electric drive train (11) of a working machine (10), wherein the drive train (11) comprises a working drive (20) having an electric working motor (21) and a traction drive (30) having an electric traction motor (31) and wheels (32), wherein the working machine (10) is decelerated externally and wherein the braking force acting on the wheels (32) due to the deceleration can be less than the driving force acting on the wheels (32) due to the mass moment of inertia of the traction motor (31). The method according to the invention is characterized in that, when it is foreseeably detected (200) by means of a situation detection that the braking force acting on the wheels (32) due to the deceleration is less than the driving force acting on the wheels (32), a current (300, 301) in the opposite direction of its operation is applied to the traction motor (31) to reduce the rotational speed. The invention also relates to a corresponding electric drive train (11) and a corresponding working machine (10).

A cordless aw is provided with regenerative braking means that increases the number of repeated cuttings the saw is able to perform (x) per full discharge cycle of the battery pack, as compared to the number of repeated cuttings achievable by the same saw not employing a regenerative braking means (y) per full discharge cycle of the battery pack, such that x / y is approximately at least one of the following: i) 1.1 when cutting a Pressure-Treated (PT) lumber workpiece having a cross-sectional size of approximately 89 mm×89 mm±2 mm, ii) 1.15 when cutting a Spruce Pine Fir (SPF) lumber workpiece having a cross-sectional size of approximately 38 mm×89 mm±2 mm, or iii) 1.25 when cutting Medium Density Fiberboard (MDF) workpiece having a thickness of approximately 19 mm±1 mm and a width of approximately 76 mm±2 mm.

A regenerative braking system for an electrified vehicle includes a battery system, an electric motor and a regenerative system resistor. The battery system selectively stores and delivers power. The electric motor is powered by the battery system and transfers drive torque to a driveline for propulsion of the vehicle and that selectively directs regenerative power in a first mode to the battery system during regenerative braking. The regenerative system resistor is selectively moveable between a first position during the regenerative braking in the first mode and a second position where regenerative power is directed to the regenerative system resistor and dissipated as heat in a second mode.