145results about "Stopping arrangements" 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 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.

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.

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.

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.

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

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.

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.

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.

The invention discloses a safety torque cancelling circuit which comprises a channel loop configured to obtain a safety signal from a safety loop of an elevator and cut off a power supply of an isolation driving unit of an upper bridge arm switch tube or / and a lower bridge arm switch tube in response to the state of the safety signal; and the diagnosis loop receives the output state of the channel loop and is used for cutting off the driving signal of the upper bridge arm switch tube or / and the lower bridge arm switch tube when the diagnosis is abnormal. While electronic star sealing is realized, the fault margin and safety of the STO are not reduced. In addition, as the STO only blocks the driving signal of the upper bridge arm or the lower bridge arm, the lower bridge arm or the upper bridge arm can adopt an electric braking method for improving the braking torque disclosed by CN117997175A.

An electrical equipment system includes electrical equipment, a battery pack with a wireless communication function which is mounted to the electrical equipment, and a portable terminal wirelessly communicable with the battery pack. The electrical equipment includes a drive part, a control part which controls the drive part, an operation part which instructs start and stop of the drive part, and a storage part which stores operation parameters for driving the drive part. Various operation parameters, such as an operation amount of the operation part for starting the drive part of the electrical equipment, are configured to be changeable by a management application installed in the portable terminal.

This invention provides a blade disc operation control circuit, a safety protection system, and a lawnmower robot, relating to the field of power electronics technology. The circuit includes: a control module that acquires voltage signals from electronic devices and determines the current circuit state based on these signals; a drive module; a three-phase bridge module; and a brake protection module, including a first brake protection submodule or a second brake protection submodule. If the current circuit state is open-circuit, the control module outputs a brake signal to the drive module. Upon receiving the brake signal, the drive module drives the three-phase bridge module to send a first braking signal to the blade disc motor. If the current circuit state is short-circuit, the brake protection module sends a second braking signal to the blade disc motor. This invention can react quickly to open-circuit or short-circuit faults, causing the blade disc to stop rapidly, thus meeting the functional safety requirements of the lawnmower and reducing the risk of safety accidents.

A method for operating a power tool includes electronically braking a motor shaft of a brushless electric motor using a controller of the power tool. A spindle unit, positioned on the motor shaft, has a known rotational position relative to at least one pole of a plurality of poles of a rotor of the motor shaft. The method further includes stopping the motor shaft, using the controller, in a predetermined rotational position relative to a stator of the electric motor based on a detected position state of a plurality of position states as detected by a plurality of position sensors of the electric motor. The plurality of position states identify a rotational position of the rotor relative to the stator, and at the predetermined rotational position, a spindle lock of the power tool is configured to engage the spindle unit without additional rotation of the motor shaft.

According to one aspect of the present invention, an electric working machine is provided with a brushless motor, a drive circuit, and a control circuit. The control circuit performs a driving operation, a braking operation, and a switching operation. During the driving operation, the brushless motor rotates on the basis of the induced voltage of the brushless motor. In a braking operation, a pair of switches among the 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 action comprises switching the switch pair. In the switching operation, the switch to be turned off is turned off on the basis of the current flowing through the switch to be turned off satisfying the turning-off requirement.

The utility model provides a circuit system for performing current protection control cycle by cycle, the circuit system comprises an over-current protection unit and an unlocking unit, the over-current protection unit comprises a sampling circuit and a first comparator, the unlocking unit comprises a second comparator, and a signal of an out-phase input end of the second comparator is based on a PWM signal. The PWM signal is a signal input to a power switch of a motor driving circuit, a signal of an in-phase input end of the second comparator comes from an output end of the overcurrent protection unit, an output end of the second comparator is connected to the overcurrent protection unit through a trigger circuit, the trigger circuit comprises a first diode D1, a second diode D2, a third diode D3 and a fourth diode D3, the positive electrode of the first diode D1 is connected with the in-phase end A + of the first comparator and the first triode Q1, the base electrode of the first diode D1 is connected with the output end of the second comparator, the collector electrode of the first diode D1 is connected with the negative electrode of the first diode D1, and the emitter electrode of the first diode D1 is connected with the output end of the first comparator. The utility model further provides a motor control circuit and a brushless direct current motor.

A motor braking system using a multi-phase reversal mechanism is provided. In a motor driving mode, the motor braking system, according to one or more of voltage signals respectively of three phases of a three-phase motor, determines which one of the three phases of the three-phase motor is a phase from which a current flows as a first driving phase, and selects another of the three phases of the three-phase motor as a second driving phase. In a motor braking mode, the motor braking system changes a driving operation performed on the three-phase motor such that a reverse current flows from the second driving phase to the first driving phase.

The invention provides a brake control device and a brake control method of a three-phase motor for an electric tool. The brake control device comprises a switching circuit which comprises three upper bridge arm switches and three lower bridge arm switches, and each upper bridge arm switch is connected in an upper bridge arm power-on path and can control the power-on and power-off of the power-on path; each lower bridge arm switch is connected in a lower bridge arm power-on path and can control the power-on and power-off of the power-on path; a detection circuit configured to detect a rising edge zero crossing point of each phase back electromotive force according to the terminal voltage of each phase; and a controller configured to control the switching circuit such that the three-phase motor is braked in: alternating execution of a first braking mode and a second braking mode, and the time when a continuous time period elapses from the time when the rising edge zero crossing point of each phase of counter electromotive force is detected is used as the switching time when the first braking mode is switched to the second braking mode. And the controller adjusts the braking strength of the three-phase motor by adjusting the duration of the continuous time period.

The utility model discloses a push rod limit control device which comprises a motor and further comprises two Hall sensors, a motor control module and a magnet arranged on a push rod, the motor controls the push rod to move between the two Hall sensors, and when the push rod is close to one Hall sensor, the magnet on the push rod triggers the Hall sensors to change signals. The motor control module is triggered to work through change of signals of the Hall sensor, and the motor is controlled to stop running. A traditional switch is replaced with a Hall sensor induction mode, so that the push rod is simpler in overall structure, smaller in size and still applicable to some occasions with limited sizes.

This invention provides a braking method and braking device for a brushless DC motor. The brushless DC motor includes multiple bridge arms, each bridge arm having an upper bridge arm switch and a lower bridge arm switch connected in series. The bridge arms are connected to a stator coil of the brushless DC motor through a node between the upper and lower bridge arm switches. The method includes: receiving a braking signal for braking the brushless DC motor; generating a first control signal in response to the braking signal to control all upper bridge arm switches to open or control all lower bridge arm switches to open; and generating a second control signal in response to the braking signal to control all lower bridge arm switches or all upper bridge arm switches not controlled by the first control signal to be turned on in a predetermined manner to generate a gradually increasing current in all bridge arms and all stator coils to brake the brushless DC motor.

The present application discloses a brake control method, a brake control device and a computer readable medium. The control method includes following steps: collecting a voltage value of a voltage-dividing resistor R12; calculating a first bus voltage value according to the voltage value of the voltage-dividing resistor R12; detecting a change of a bus voltage within a first time interval and calculating a voltage change rate; estimating a second bus voltage value within a second time interval according to the voltage change rate, the second bus voltage value being an estimated bus voltage value; determining a magnitude relationship between the estimated bus voltage value and a preset value; in response that the estimated bus voltage value is greater than the preset value, stopping a slow braking; in response that the estimated bus voltage value is less than the preset value, continuing to performing the slow braking.

The invention discloses a three-phase electromagnetic brake of a permanent magnet synchronous motor, which is arranged at the right end of a main shaft of the permanent magnet synchronous motor, and a magnet yoke is correspondingly connected with X, Y and Z three-phase windings of the permanent magnet synchronous motor through a coil A, a coil B and a coil C which are in star connection; when the motor stops, the coil loses power, and the magnetic attraction force of the magnet yoke completely disappears; the armature loses electromagnetic attraction constraint and is pushed by the spring to axially move towards one side of the friction plate along the guide column; sliding friction force is generated between the armature and the friction plate, the friction force acts on the main shaft, mechanical braking torque opposite to the rotating direction of the main shaft is formed, and the main shaft is mechanically locked. According to the invention, automatic unlocking when the motor is started and automatic braking when the motor is stopped are realized, and the permanent magnet synchronous motor has the comprehensive technical advantages of fast response, stable braking, long service life and high safety, is a preferable scheme for high-performance braking in the permanent magnet synchronous motor, and can be widely applied to the field with high requirements on braking safety and stability.

Arrangement for generating control signals (22) for controlling an electric motor (10), comprising at least one microcontroller (12), at least two driver units (14) and at least one bus, wherein the at least one microcontroller (12) and the at least two driver units (14) are connected to each other via the at least one bus and a unit (30) for generating the control signals (22) is provided in the at least two driver units (14).

The utility model discloses a motor braking circuit during power failure, which comprises a permanent magnet motor, the input end of the permanent magnet motor is connected in parallel with two groups of lines, the first group of lines is powered by a controller, the controller is powered by a power line, and the second group of lines of the permanent magnet motor are short-circuited through a normally closed switch. The normally closed switch is connected with a power line; when the power supply stops supplying power, the normally-closed switch enables the second group of lines to be short-circuited, and when the power supply supplies power, the normally-closed switch enables the second group of lines to be disconnected. The device has the advantages of preventing the rod from being lifted by mistake under abnormal conditions and preventing the controller from being out of control due to faults.

To provide a motor drive device capable of making a motor output stabilizing in switching of a one-side driving mode and both sides driving mode in a structure of two inverters, and holding continuity.SOLUTION: The motor drive device controls a driving of a motor having a winding wire of two or more phase in which both end points are opened. A switching adjustment part 303 determines a switching of a "one-sided driving mode" that makes one of two inverters 60 and 70 performing a switching drive and a "both-sided driving mode" that makes both of the two inverters 60 and 70 performing the switching drive, and adjusts an output of each of the inverters 60 and 70 at the switching so that the output of the motor before and after the switching of the driving mode is continued. The switching adjustment part 303 increases a power amount of a driving start side inverter by gradually changing from zero at the switching from the one-sided driving mode to the both-sided driving mode, and reduces the power amount of a driving termination side inverter by gradually changing to zero at the switching from the both-sided driving mode to the one-side driving mode.SELECTED DRAWING: Figure 4

An embodiment of the present invention relates to the technical field of motor control and discloses a motor rotation control method and apparatus, the method including the steps of: performing an inverse Park transform and an inverse Clark transform on control output results obtained from a position loop, a velocity loop, and a current loop to obtain an SVPWM signal for a current period, whereby an interrupt control period is decoupled from a PWM signal reference channel; obtaining current position sampling information of the motor, predicting the position sampling information, and obtaining motor rotor position result information within the prediction period; performing an inverse Park transform and an inverse Clark transform on the position result information to obtain an SVPWM signal for a prediction period; generating an SVPWM control signal group based on the SVPWM signal for the current period and the SVPWM signal for the prediction period, and controlling the motor based on the SVPWM control signal group. In this embodiment of the motor rotation control method, an interrupt trigger signal is added to achieve decoupling from the PWM signal reference channel, and an interrupt function scheduling period is added to reduce CPU load without affecting the SVPWM update frequency during motor control.

The invention discloses a self-recovery method and device for the zero position of a motor of an electronic mechanical braking system.The method comprises the following steps that when a front wheel slave controller and a rear wheel slave controller are powered off abnormally at the same time, a master controller sends a braking request and a braking torque signal the same as the parking torque to the front wheel slave controller; and after the front wheel braking torque reaches the target value and is stable, the state of an EPB actuator is judged. If yes, the master controller sends a rear wheel zero calibration request to the rear wheel slave controller; if not, a parking release request is sent firstly, and then a calibration request is sent after release. And after rear wheel calibration is completed, the main controller sends a braking request and a same torque signal to the rear wheels, and after the torque is stable, a zero calibration request is sent to the front wheels. And after the front rear wheel calibration meets the preset precision requirement, a parking clamping request is sent to an EPB actuator to complete recovery. According to the technical scheme, the zero calibration problem of the motor after the controller is powered on after being powered off abnormally can be solved on the premise of no extra hardware.