314results about "Stopping arrangements" patented technology

Provided is an electric drum brake system, including: an electric drum brake configured to be driven by an electric motor; a current sensor configured to detect a current input to the electric motor; and a controller configured to, when parking is released, determine a parking release time based on a temperature of the electric drum brake, and when a maintenance time reaches the determined parking release time, end a parking release operation by stopping the electric motor, the maintenance time being a period of time while a state where a motor current detected by the current sensor reaches a target current is maintained.

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 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.

There is provided a control method of a household appliance (100), the household appliance (100) comprising a motor (120) driven by a driving current, the method comprising the steps of: receiving a stop signal for stopping the motor (120); executing an open brake control for stopping the supply of the drive current to the motor (120) on the basis of receiving the stop signal; estimating an initial motor speed of the motor at the start of the open brake control based on a motor phase current of the motor at the start of the open brake control; determining a start time of short-circuit brake control for applying torque in a direction opposite to a rotation direction of the motor based on the estimated initial motor speed; and executing short-circuit brake control at the determined short-circuit brake control start time.

The invention discloses a method for safely controlling the braking torque of a driving system with a permanent magnet synchronous motor, the driving system is provided with the permanent magnet synchronous motor and a frequency converter, and the method is characterized by comprising the following steps: on the premise that a driving signal of an upper bridge arm switch tube is blocked, starting the frequency converter; a driving signal of a corresponding lower bridge arm switch tube when the phase current of the permanent magnet motor flows to a frequency converter is turned off in advance, and a driving signal of a corresponding upper bridge arm switch tube when the phase current of the permanent magnet motor flows out of the frequency converter is turned off in advance on the premise that the driving signal of the lower bridge arm switch tube is blocked. And the phase current of the permanent magnet synchronous motor is controlled. By alternately blocking the switch tubes of the upper bridge arm and the lower bridge arm, larger braking torque and smaller torque pulsation can be provided, heat dissipation of the IGBT / diodes is balanced, and meanwhile power supply from an intermediate circuit of the frequency converter to the permanent magnet motor is prevented.

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.

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.

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.

The invention discloses a DC motor anti-pinch control system and method based on PWM slope, and belongs to the technical field of motor control, and the system comprises an information collection module, a PWM slope calculation module, a PWM slope monitoring module, a current monitoring module, a speed monitoring module and a clamping state judgment module. The information acquisition module acquires a PWM signal, a current signal and a motor operation rotating speed for controlling the direct current motor; the PWM slope calculation module calculates the slope value of the PWM signal; the PWM slope monitoring module, the current monitoring module and the speed monitoring module are used for setting threshold values and monitoring data changes in real time; the clamping state judgment module judges whether the push rod is in a clamping state or not by analyzing monitoring results of the three data; the instantaneous change of the motor load is reflected by combining and analyzing current, rotating speed and PWM signal slope monitoring, the load change can be quickly detected, anti-pinch protection measures can be triggered in time, and the response speed and safety of the system are improved.

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 relates to the technical field of electro-hydrostatic actuators, and discloses an EHA driving and control integrated device based on a three-in-one integrated framework, which comprises a power conversion main loop part, a control auxiliary part and a motor M which are connected with one another, the power conversion main loop part comprises a soft start + capacitor, a SiC power component and a common mode inductor, the soft start + capacitor, the SiC power component and the common mode inductor are sequentially connected and are all connected with the control auxiliary part, and the common mode inductor is connected with the motor M; the control auxiliary part comprises an upper computer, an auxiliary power supply, an EHA controller and an actuator; the EHA controller is respectively connected with the upper computer, the auxiliary power supply, a soft start + capacitor, a SiC power assembly, the actuator and a motor M; according to the invention, the motor driving module, the EHA controller and the state monitoring module are integrated in a single shell, precise regulation and control from outside to inside are realized by adopting a three-closed-loop control architecture, the response delay of the system is reduced, and the advantages of compactness, high power density and quick response brought by integration, standardization and efficient heat dissipation design are highlighted.

DC motor (1) for operation in an external magnetic field comprising: a rotor (2) which is rotatable about an axis of rotation (5) and has at least two windings (10, 11), at least four continuous rotary transformers (3), two rotary transformers (3) being assigned to each of the windings (10, 11) and being designed to supply the respectively assigned winding (10, 11) with direct current, an angle sensor (4) designed to determine the angular position of the rotor (2), and a control unit (15) designed to control the current supply to at least one of the windings (10, 11) as a function of the angular position of the rotor (2), wherein the motor (1) is aligned with an external magnetic field during operation such that the axis of rotation (5) extends transversely to the external magnetic field.

A method is provided for controlling a power tool that includes a motor having a rotor, a power switch circuit coupled to the motor, a trigger switch, and a controller configured to control a switching operation of the power switch circuit. The method includes providing drive signals for driving the power switch circuit by controlling a switching operation of the power switch circuit over a plurality of switching vectors, measuring a first current value of a single shunt element at a first time during a first vector and a second current value of the shunt element at a second time during a second vector, calculating phase currents of the motor based on the first and second current values, determining an angular position of the rotor based on the phase currents, and controlling a pulse-width modulation of the plurality of drive signals based on the angular position of the rotor.

The present application provides a control device of an electric motor, which can quickly and effectively stop at a specific position, thereby achieving further high-speed positioning. The control device of the electric motor is used for stopping a rotating shaft rotating at a specified speed at a specific position after a stop instruction, and comprises: a first time calculation unit, which calculates a first time for stopping the rotating shaft at a target stop position without changing the rotating direction according to a current speed, the target stop position and an acceleration at the time of positioning; a second time calculation unit, which calculates a second time for stopping the rotating shaft at the target stop position by rotating the rotating shaft in the reverse direction after temporarily stopping the rotation of the rotating shaft according to the current speed, the target stop position and the acceleration at the time of positioning; a comparison unit, which compares the first time with the second time; and a directional stop control unit, which performs stop control of the electric motor in a manner of shortening the time until the rotating shaft is stopped at the target stop position based on the comparison result of the comparison unit.

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.

The present invention discloses an electric control device of a hauling vehicle and a hauling vehicle. A leakage detection module is provided to detect the insulation resistance value of the power supply circuit of the oil pump motor before the oil pump motor of the hauling vehicle is started. When the control module receives a start command and the insulation resistance value is greater than a preset insulation resistance value, the control power supply is controlled to supply power to the oil pump motor to start the oil pump motor and the leakage detection module is controlled to stop working, so as to avoid introducing the power supply current of the oil pump motor into the leakage detection module and causing damage to the leakage detection module. The temperature acquisition module and the current acquisition module are respectively used to detect the temperature and power supply current of the oil pump motor of the hauling vehicle, and when the temperature exceeds the preset temperature or the power supply current is not within the preset current range, the control power supply is controlled to stop supplying power to the oil pump motor to stop the oil pump motor and the leakage detection module is controlled to start working, thereby ensuring the safety and stability of the oil pump motor before and after starting, and protecting the safety of underground workers.

This motor control device controls a vehicle driving motor that is driven by a power converter for performing power conversion from DC power to AC power and is provided with coils of a plurality of phases. The motor control device comprises: a coil temperature acquisition unit that acquires or estimates the temperatures of the coils of the plurality of phases; a torque restriction unit that restricts the output of the motor when the temperature of the coil of at least one phase among the coils of the plurality of phases exceeds a first threshold value; and a position control unit that controls a stop position of the rotor of the motor when the temperature of the coil exceeds a second threshold value that is a threshold value lower than the first threshold value. When the temperature of the coil exceeds the second threshold value, the position control unit controls the stop position of the rotor of the motor so that the absolute value of current flowing through the phase having said coil temperature is equal to or less than a predetermined value when the vehicle stops.

The present invention provides a motor brake control system. When a control circuit determines to brake, the control circuit controls a drive circuit to close a first upper bridge switch and a second upper bridge switch, and fully open a first lower bridge switch and a second lower bridge switch. After a period of time, the control circuit controls the drive circuit to close one of the first and second lower bridge switches, while keeping the other fully open. After a period of time, the control circuit controls the drive circuit to close the other of the first and second lower bridge switches, while fully opening one of the first and second lower bridge switches.

To provide a technique capable of holding energization in an electric motor with a simple configuration even after a manual switch for a reciprocating tool is turned off.SOLUTION: A reciprocating tool includes a reciprocating member, an electric motor, a transmission device, a drive circuit, a first manual switch, a switch element and a control circuit. A first contact point of the first manual switch is connected to a power supply, and a second contact point of the first manual switch is connected to the drive circuit. The first manual switch in its on state connects the first contact point to the second contact point. The switch element (i) is turned on when it receives an electric signal, and (ii) establishes electrical continuity between the first contact point and the second contact point in its on state. In response to at least the first manual switch being turned on, the control circuit continues to output the electric signal to the switch element until the drive of the electric motor is stopped.SELECTED DRAWING: Figure 6

The invention relates to a belt conveyor device (1) and to a method for stopping a belt conveyor device (1) in a controlled manner. In particular for directly driven belt conveyor devices (1), an event (E) such as a power failure can lead to a fast stoppage of a belt driving roller (5). A fast stoppage of the belt driving roller (5) leads locally to a reduction in the belt tension of the belt (3). Due to the local reduction in the belt tension, a compression of the belt (3) or even creasing of the belt (3) can damage the belt (3). The aim of the invention is to prevent damage to the belt (3). This aim is achieved, according to the invention, in that when the event (e) occurs the motor (7) is slowly decelerated to a standstill. The electrical power for the slow deceleration is preferably drawn from an energy accumulator (13), the energy accumulator (13) being associated with a power supply (9) for the motor (7). The deceleration preferably takes place according to a characteristic curve (K), the characteristic curve (K) specifying the rotational speed (w) of the motor (7) as a function of the time (t).

A vehicle control device (10) which includes control means (11) for controlling an engine (30) mounted on a vehicle (100) and an electric motor (34) that enables a crankshaft (30a) of the engine (30) to rotate is provided. When an idle stop condition is satisfied, the control means (11) executes: automatic stop of the engine (30); and stop position control for braking the crankshaft (30a) rotating due to inertia by a driving force of the electric motor (34) so as to stop the crankshaft (30a) at a predetermined position (P). The stop position control includes: pre-brake control for controlling the electric motor (34) such that a rotation speed of the crankshaft (30a) decreases according to predetermined target transition information (Tne); and main brake control for controlling the electric motor such that the crankshaft (30a) is stopped at the predetermined position (P) after the pre-brake control.

To solve problems in the conventional art.SOLUTION: A bidirectional motor (36) is for a gas engine replacement device (10). An embodiment provides a gas engine switching device (10) including: a housing (14); a battery receptacle (54); a motor (36); a power take-off shaft (38) that receives a torque from the motor (36); a power switching network (310) configured to selectively provide electric power to the motor (36); and an electronic processor (302) coupled to the power switching network (310). The electronic processor (302) is configured to rotate the motor (36) in a first direction, and to receive an input for switching a rotational direction of the motor (36). The electronic processor is configured to control the power switching network (310) to stop the motor (36), and to rotate the motor (36) in a second direction after the motor (36) is stopped by controlling the power switching network (310).SELECTED DRAWING: Figure 1

The invention discloses a permanent magnet synchronous motor starting control method based on high-frequency square wave injection. A bus voltage threshold value is set; during initial starting, high-frequency square waves are injected into the d axis, and the rotor position and the angular speed are obtained; performing reverse braking and forward starting control on the rotor according to the rotor position and the angular speed; during braking, reverse torque is applied to the rotor through rotating speed and current double-closed-loop control; circularly acquiring real-time bus voltage and comparing the real-time bus voltage with the bus voltage threshold value; and if the real-time bus voltage exceeds the bus voltage threshold, increasing the voltage amplitude of the high-frequency square wave injected by the d axis. The rotor position and the angular speed are obtained by injecting the high-frequency square waves, and the problem that the rotor observer is large in error at the low speed is solved; when the reverse rotation is started, the current of the stator coil is increased by increasing the voltage amplitude of the high-frequency square wave, so that the stator coil is used as an energy-consuming circuit to consume the counter electromotive force, the real-time bus voltage is reduced, and the cost is reduced.

[Subject Matter] To provide a positioning device that enables highly accurate positioning control. [Solution(s)] A positioning device consists of an actuator composed of a DC motor 200, a deceleration mechanism, and a single-phase rotation sensor 20 for detecting the amount of rotational displacement of the deceleration mechanism, and an electronic control unit 1 that electrically drives the DC motor. The electronic control unit 1 learns the time T2 required for the motor to stop after turning off the power, and decelerates and controls the DC motor 200 to stop at a target rotation stop position MP, which is approximately midway between the rising edge N+4f and the falling edge N+4r of the output pulse of the rotation sensor.

The application discloses a kind of permanent magnet synchronous motor electric shovel speed regulation system and motor control method, belong to mining equipment technical field, including: main transformer, rectification feedback unit, several permanent magnet synchronous motors, several frequency converters and voltage suppressor, by using permanent magnet synchronous motor as power source, the efficiency and power factor of motor in low speed area are higher, realize efficient, energy-saving green mining, electric shovel each mechanism can also adopt direct drive or half direct drive mode, reduce mechanism transmission series, further improve transmission efficiency and equipment reliability;Since the rotor of permanent magnet synchronous motor is permanent magnet, when the frequency converter fails and the brake fails at the same time, the motor will generate back electromotive force when being pulled by potential energy load, according to the power generation characteristics of permanent magnet synchronous motor, the stator is short-circuited through energy consumption device, which will generate braking torque in permanent magnet synchronous motor, so as to brake the bucket, avoid the bucket falling rapidly, electric shovel out of control accident.

The invention relates to the field of brushless direct current motors, in particular to a brushless direct current motor discharging system and method, which comprises an H-bridge driving module, a partial pressure detection module, a discharging module and a comparator U1, and is characterized in that the output end NO and the output end S0 of the H-bridge driving module are electrically connected with the positive electrode and the negative electrode of a motor respectively; the voltage division detection module outputs detection voltage Vdiv to the in-phase input end of the comparator U1, external reference voltage Vref is input to the reverse input end of the comparator U1, the output end of the comparator U1 is electrically connected with the control end of the discharging module, the H-bridge driving module drives a motor to work, the voltage division detection module detects power supply voltage in real time, and the output end of the H-bridge driving module is electrically connected with the control end of the discharging module. The comparator U1 compares the detection voltage Vdiv with the reference voltage Vref, and when the detection voltage Vdiv exceeds the reference voltage Vref, the comparator U1 controls the discharge module to be switched on and rapidly discharges the power supply voltage, so that the power supply voltage drops to a safety level, and the effect of protecting the driving chip is achieved.

This invention provides a motor control method, a motor control device, a readable storage medium, and a motor. The motor control method includes: setting a set speed and a set direction of rotation for the motor; acquiring the rotor position, operating speed, and operating direction of the motor while it is running; acquiring a first input value for the set speed and a second input value for the operating speed based on the operating direction, operating speed, set speed, and set direction of rotation; acquiring a target current based on the first and second input values; acquiring the actual current of the motor; acquiring a first control value based on the target current and the actual current; acquiring the chopping direction and duty cycle of the three-phase inverter bridge based on the first control value; acquiring the energizing phase sequence of the three-phase inverter bridge based on the operating direction of rotation; and controlling the motor operation using the three-phase inverter bridge based on the chopping direction, duty cycle, rotor position, and energizing phase sequence.

The application provides an electromechanical brake device braking force observation method, system, equipment and storage medium, and relates to the field of brake control methods.The electromechanical brake device braking force observation method comprises the following steps: using a current closed-loop control method to make a brake motor output a braking force, to push a mechanical actuator into contact with a brake disc, to gradually increase motor cross-axis current, to measure a brake disc pressure and a lead screw displacement characteristic curve, to use a third-order mathematical model to fit a curve expression, to measure the displacement of the mechanical actuator in a braking state, to obtain real-time braking force, and finally to design a brake gap adjustment method to ensure the reliability of the braking force observation.The application realizes the observation mode of the braking force of the electromechanical brake device, meets the precision requirement of the braking force observation of the electromechanical brake device, reduces the installation cost of the system, and improves the stability of long-time operation of the system.