164results about "Rotation direction control" patented technology

A stand-alone motor unit for use with a piece of power equipment includes a housing, an electric motor, a battery pack to provide power to the motor, a battery receptacle arranged on the housing and configured to receive the battery pack, and a control panel arranged on either the housing or the piece of power equipment. The control panel is operable to control operation of the electric motor.

In some examples, this disclosure describes a method that comprises controlling power switches to deliver a current to an electric motor, wherein the power switches are arranged in a bridge (e.g., an H-bridge or an h-bridge) comprising a first high-side power switch, a first low-side power switch, and a second low-side power switch. Controlling the power switches to deliver the current to the electric motor may include controlling the first high-side power switch ON and controlling the second low-side power switch ON, wherein the current to the electric motor flows through the high-side power switch and through the second low-side power switch. The method may comprise determining the current to the electric motor based on a voltage drop over one of the power switches arranged in the bridge.

The invention belongs to the technical field of motor control, and particularly relates to a motor three-phase counter electromotive force phase sequence detection circuit and a running direction judgment device. The phase sequence detection circuit comprises a comparison circuit and further comprises a tachogenerator coaxially connected with the motor to be detected, and the output end of the tachogenerator is electrically connected with the input end of the comparison circuit so that the phase sequence of the three-phase counter electromotive force of the motor to be detected can be obtained through the three-phase voltage output by the tachogenerator through the comparison circuit. The three-phase counter electromotive force of the to-be-tested motor is directly detected through the tachogenerator coaxially connected with the to-be-tested motor. The rotor of the tachogenerator rotates along with the rotation of the motor to be tested, and the rotor of the tachogenerator cuts magnetic lines in the operation process, thereby generating the three-phase counter electromotive force of the motor to be tested. The technical problem that in the prior art, when ground voltage detection is not accurate due to external interference, detected counter electromotive force is not accurate, and then the motor control effect is affected is solved.

The invention provides an oil pump motor low-temperature starting method, device and equipment and a storage medium, and relates to the technical field of motor control. Whether an oil pump motor reverse rotation instruction is sent to the vehicle or not is judged according to the first oil temperature and a vehicle gear state signal, if yes, the oil pump motor is controlled to conduct reverse rotation, then whether the state of the oil pump motor in the reverse rotation state reaches a preset condition or not is judged, and if yes, the oil pump motor is controlled to stop reverse rotation, and the vehicle is started. And finally, responding to the forward rotation starting instruction of the oil pump motor, and controlling the oil pump motor to start. Therefore, before the forward rotation starting instruction is sent to the oil pump motor, the oil pump motor is controlled to rotate reversely, the oil temperature is increased, and the oil viscous resistance is reduced, so that the probability of successful starting of the oil pump motor is increased. Therefore, the problem that when the temperature of the environment where the vehicle is located is low, motor starting fails due to the fact that the viscous resistance of oil is large is solved.

The invention provides a reducing pipeline robot based on Mecanum wheels. The reducing pipeline robot comprises a double-shaft steering engine, brushless motors arranged on the two sides of the double-shaft steering engine; the reducing Mecanum wheel comprises an outer hub disc, a guide rail optical axis, a middle hub disc, an inner hub disc, a lead screw and a stepping motor which are coaxially and sequentially connected. The reducing Mecanum wheel further comprises a hub composed of five reducing units of the same structure. The reducing unit is connected with the middle hub disc and the inner hub disc at the same time; the five variable-diameter units are unfolded or contracted to the same size at the same time to form hubs with different diameters, and the variable-diameter pipeline robot can work in pipelines with different diameters. Through the structure innovation and intelligent technology, full-scene efficient maintenance of the pipeline is achieved, and industry transformation and upgrading are promoted.

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.

The invention relates to a method for operating an electric motor (1), in particular a piston pump (9), wherein the electric motor (1) has a rotor shaft (3) and is driven with a target rotational speed (n soll ) and a target direction of rotation for the rotor shaft (3) depending on a power requirement, wherein an actual rotational speed (n Ist ) of the rotor shaft (3) is monitored. The method according to the invention is characterized in that the target direction of rotation is changed for a predetermined period of time (t) when the actual rotational speed (n Ist ) is equal to zero and the target rotational speed (n soll ) is not equal to zero, and the electric motor (1) is then driven again with the target rotational speed (n soll ) and the target direction of rotation.

The invention provides a method and system for adjusting the speed of a variable-frequency driving motor through a controller, and relates to the technical field of speed regulation control, and the method comprises the steps: constructing a planetary gear train coupling structure based on the dual-motor power of a frequency converter; establishing two-wire communication connection by adopting a ModBus communication protocol, and dynamically acquiring real-time operation data of the frequency converter; the real-time operation data is dynamically analyzed through a PID controller, and a real-time speed regulation decision is obtained in combination with a predetermined load response strategy; and performing speed regulation control on the planetary gear train coupling structure according to the real-time speed regulation decision. According to the invention, the technical problem of low speed regulation control precision of the motor in the prior art can be solved, the technical targets of quick response, precise speed regulation and efficient energy distribution of the motor under different load working conditions are achieved, and the technical effect of improving the speed regulation control precision of the motor is achieved.

To provide an electric work machine which enables multiple functions to be selectively performed based on easy operation to a user interface while suppressing complication of the configuration of the user interface.SOLUTION: An electric work machine includes a motor, a first operation unit, a second operation unit, and a control circuit. The control circuit rotates the motor in a first control method, based on a situation where the first operation unit is driven and operated and the second operation unit is moved to a first region. The control circuit stops the motor, based on a situation where the first operation unit is not driven and operated and / or the second operation unit is moved to a second region. The control circuit rotates the motor in a second control method, based on a situation where the first operation unit is driven and operated and the second operation unit is moved to a third region.SELECTED DRAWING: Figure 8

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 application discloses a BLDC motor rotating speed calculation method based on FPGA, and belongs to the field of motor control technology and FPGA digital system design, and comprises the following steps: collecting three-way Hall signals in a BLDC motor and pre-processing the three-way Hall signals to obtain pre-processed three-way Hall signals; judging whether the pre-processed three-way Hall signals have static faults and line sequence faults; judging the rotating state of the BLDC motor, including forward rotation, reverse rotation and stop; fusing the pre-processed three-way Hall signals to obtain one-way low-frequency signals; performing sliding frequency counting on high-frequency signals and low-frequency signals to obtain high-frequency accumulated values and low-frequency counting values respectively; wherein the high-frequency signals are system clock frequency signals; and calculating the rotating speed of the BLDC motor according to the high-frequency accumulated values and the low-frequency counting values. The application can simultaneously adapt to high-speed and low-speed use scenarios, can simultaneously control multiple motors to realize rotating speed calculation, and has strong real-time performance, high calculation precision and high reliability.

This invention relates to the field of blow-dryer / vacuum combos, and more particularly to a brushless motor drive control circuit and device for such combos. The circuit includes a microcontroller, a voltage detection unit, and a driver chip. When the user presses the mode switch button, the microcontroller outputs a voltage detection signal to the voltage detection unit. The voltage detection unit detects the voltage waveform of the power supply and outputs a mode switch signal to the microcontroller when the voltage waveform crosses zero. The microcontroller outputs a PWM signal corresponding to either the blow-drying or vacuuming mode to the driver chip based on the mode switch signal. The driver chip controls the direction of the brushless motor, thus switching between the blow-drying and vacuuming modes of the blow-dryer / vacuum combo. This circuit, by switching modes when the voltage waveform crosses zero, effectively reduces current surges, electromagnetic interference, and motor losses, thereby improving system stability and extending equipment lifespan.

The present invention proposes a device for automatically cleaning cobwebs from a visibility meter. The device comprises a cobweb removal device body mounted on the visibility meter. The cobweb removal device body comprises a hollow channel with a mesh partition installed at one end and connected to a container at the other end. A permanent magnet brushless DC motor is installed within the channel near the mesh partition. A side of the channel between the container and the permanent magnet brushless DC motor is provided with evenly distributed, openable holes. A control circuit board is placed within the container and connected to the permanent magnet brushless DC motor. Before using the visibility meter, the operator can turn on the switch of the present invention to automatically clean the visibility meter, facilitating cobweb cleaning while minimizing power consumption.

An electric machine system includes an electric machine, an electric power converter, and a control unit. The electric machine includes a stator that includes coils, and a rotator that includes a magnet and is rotatable with respect to the stator. The electric power converter inputs electric power with respect to the coils of the electric machine. The control unit controls the electric power converter. The control unit includes an output unit and a correction unit. The output unit outputs a control signal for operating the electric power converter to the electric power converter. The correction unit corrects a phase of the control signal that determines input timing of the electric power with respect to the coils of the electric machine. The correction unit corrects the phase so that the magnitude of the electric power approaches an extreme value.

The application relates to a control method for realizing a sweep-vibration toothbrush through a direct-current brushless motor, which comprises the following steps: detecting the components of a magnetic field generated by a rotor end magnetic field generating element on a first detection axis and a second detection axis to obtain a first detection signal and a second detection signal; performing arctangent calculation based on the two detection signals to obtain a current position angle of the motor; obtaining a swing angle, a swing speed, a vibration frequency and a vibration amplitude according to a toothbrush working mode, and generating a target position angle; determining a motor rotation direction according to the angle difference between the current position angle and the target position angle, and determining a PWM control duty cycle based on the angle difference size; generating three-phase PWM reference values based on the current position angle, and outputting the three-phase PWM reference values to a PWM generator after amplitude modulation according to the duty cycle to drive the motor to move to the target position angle. The method has simple control links and low operation amount, can reduce cost and improve the stability and consistency of sweep-vibration following, and is convenient for realizing multi-mode quick switching and parameterized adjustment.

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.

A method for automatic control switching for driving a sensorless motor of a power tool, the method including generating, using a signal generator, a high-frequency injection signal. The method includes coupling, using a coupling circuit, the high-frequency injection signal to an injection coil of the sensorless motor. The method includes decoupling, using a de-coupling circuit, a response to the high-frequency injection signal from a phase coil of the sensorless motor. The method includes determine a sensorless motor condition based upon the response of the injection coil to the high-frequency injection signal. The method includes driving, using a controller of the power tool, the sensorless motor based upon the sensorless motor condition.

A power tool including a housing, an input, a gear train, a motor at least partially supported by the housing and coupled to the gear train, and a controller including a processor and a memory. The controller is coupled to the input and the motor and is configured to receive an input signal from the input, determine an operating direction and an operating speed based on the input signal, cause the motor to rotate the gear train in a direction opposite the operating direction for a predetermined amount of rotation, and cause the motor to rotate in the operating direction at the operating speed.

The invention discloses a control method and device for electric equipment and a computer readable medium, and the electric equipment comprises a brushless motor, a current detection circuit, a pressure sensor and a linear driver, and obtains an original current signal collected by the current detection circuit and an original pressure signal collected by the pressure sensor in a current collection period; and preprocessing the original current signal and the original pressure signal to obtain a decision current signal and a decision pressure signal, determining a target position of the linear driver under the condition of determining that a clamping event occurs according to the decision current signal and the decision pressure signal, and controlling the brushless motor to rotate reversely, and the output torque of the brushless motor is adjusted according to the current position periodically fed back by the linear driver and the target position until the linear driver returns to the target position. The misjudgment rate caused by a single clamping detection mode can be reduced, the clamping judgment robustness is improved, and accurate clamping judgment and real-time high-precision back-off clamping prevention are achieved.

The present invention provides a resistance gear adjustment system and method for a fitness chair based on a non-linear spring motor, relating to the technical field of fitness equipment, including: a non-linear spring motor, which is arranged inside the fitness chair and connected to the other end of the reed through a pull rope; a gear controller, which is arranged inside the fitness chair and connected to the non-linear spring motor. The gear controller includes controlling the non-linear spring motor to tighten the pull rope according to the real-time spring tension value of the non-linear spring motor and when the real-time spring tension value is less than the spring tension value of the target gear position, so as to reduce the gap between the pole piece and the magnetic force assembly, and controlling the non-linear spring motor to first relax and then tighten the pull rope when the real-time spring tension value is greater than the spring tension value of the target gear position, so as to increase the gap between the pole piece and the magnetic force assembly until the real-time spring tension value is equal to the target spring tension value. The beneficial effects are that the gear adjustment operation is completed simply through the gear controller; the inaccuracy of gear adjustment caused by the inertia of the spring motor is avoided.

The invention relates to a method for operating a permanent magnet synchronous motor (2) of a hand-held processing device (1), wherein the method comprises the steps: a) sensorless determination of a position parameter (POG) representative of a position (PO) of a rotor (4) of the synchronous motor (2) in a standstill, b) determination of a direction parameter (RIG) for continuous rotation of the rotor (4) from standstill in a direction (RI) as a function of the determined position parameter (POG) such that an amount (BDM) of an achievable torque (DM) achievable by the synchronous motor (2) when sensorlessly driven to rotate in the direction (RI) is greater than an amount (BLM) of a breakaway torque limit (LM) of the processing device (1), and c) sensorless driving of the synchronous motor (2) as a function of the determined direction parameter (RIG) to rotate in the direction (RI).

The invention relates to a method for operating an electric motor (1), in particular of a piston pump (9). The electric motor (1) has a rotor shaft (3) and is actuated with a target rotational speed (nSoll) and a target rotational direction for the rotor shaft (3) on the basis of a power request, and the actual rotational speed (nIst) of the rotor shaft (3) is monitored. The method according to the invention is characterized in that the target rotational direction is changed for a specified duration (t) if the actual rotational speed (nIst) is equal to null and the target rotational speed (nSoll) does not equal null, and the electric motor (1) is then actuated again at the target rotational speed (nSoll) and in the target rotational direction.

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.

A method for identifying initial angle of permanent magnet synchronous door machine by frequency converter, based on a device for identifying initial angle of permanent magnet synchronous door machine by frequency converter, the device comprising: a control module, a current generating module, a permanent magnet synchronous door machine rotation angle and direction judging module, an incremental encoder; the method steps are as follows: step 1), preset: initialization rotation times Count=0, flag bit Flag=0, maximum times MaxCount is a set value; preset: lower limit LowAngle of electric angle is 0 degree, upper limit HighAngle of electric angle is 360 degrees, preset: electric angle Angle is taken as 180 degrees, represented as: LowAngle=0°; HighAngle=360°; Angle=180°.

A power tool including a housing, an input, a gear train, a motor at least partially supported by the housing and coupled to the gear train, and a controller including a processor and a memory. The controller is coupled to the input and the motor and is configured to receive an input signal from the input, determine an operating direction and an operating speed based on the input signal, cause the motor to rotate the gear train in a direction opposite the operating direction for a predetermined amount of rotation, and cause the motor to rotate in the operating direction at the operating speed.

The present disclosure provides a driving device of a treadmill, and a treadmill. A servo motor of the driving device of a treadmill is internally and / or externally provided with an encoder, and connected to a controller through the encoder. A transmission shaft of the servo motor is in transmission connection with a roller of the treadmill. The controller is used to adjust change direction and change amplitude of a rotation angle of the servo motor by transmitting a control signal to the encoder, thus driving the roller of the treadmill to vibrate horizontally or rotate in one direction. Based on the driving device of the treadmill, a treadmill or a treadmill can drive a roller of a treadmill, thus driving a belt to vibrate, rotate in one direction, or vibrate horizontally in the process of rotating in one direction.

The invention provides a motor starting direction judgment method, a storage medium and a motor control system, the motor starting direction judgment method is applied to the motor control system, and the motor control system comprises a control module, a power supply, a voltage sampling module, an inverter and a motor; the motor starting direction judgment method comprises the steps that when the rotating speed of a motor reaches a preset rotating speed, a first phase and a second phase of an inverter are suspended; detecting the voltage of the first phase to obtain a first phase voltage value; and acquiring time windows on two sides of the first duration according to the first phase voltage, and judging whether the motor is in a forward rotation state or a reverse rotation state according to an accumulated value of the first phase voltage in the time windows. According to the method, the first phase voltage and the second phase voltage of the inverter are obtained, the operation state of the motor is judged by detecting the voltage accumulated value of the time windows on the two sides within the duration, and therefore the purpose of obtaining the rotation direction of the motor rotor under the condition that no position sensor exists is achieved.

Bi-directional motor (36) for gas engine replacement device (10). One embodiment provides a gas engine replacement device (10) including a housing (14), a battery receptacle (54), a motor (36), a power take-off shaft (38) receiving torque from the motor (36), a power switching network (310) configured to selectively provide 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 receive an input to switch a rotation direction of the motor (36). The electronic processor is also configured to control the power switching network (310) to stop the motor (36) and rotate the motor (36) in a second direction after controlling the power switching network (310) to stop the motor (36).

This invention proposes a winch control method for controlling the operation of a MOSFET full-bridge topology circuit. The method includes an adaptive algorithm to automatically adjust the PWM control signal: sampling the input current of the winch's electric motor every cycle or every N cycles and calculating the current change rate. To avoid noise interference, the current value is processed to obtain the calculated current. The PWM control signal is then automatically adjusted based on this calculation, specifically as follows: [Calculation details omitted]. This control method facilitates better control of the electric winch operation. The invention also proposes a system, a smart terminal, and a medium for implementing the aforementioned control method.