92results 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.

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 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.

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.

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.

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.

A method for operating an electric motor, in particular of a piston pump. The electric motor has a rotor shaft and is actuated with a target rotational speed and a target rotational direction for the rotor shaft as a function of a power demand, wherein an actual rotational speed of the rotor shaft is monitored. In the method, the target rotational direction is changed for a specified period of time if the actual rotational speed is equal to zero and the target rotational speed is unequal to zero, and the electric motor is then actuated again at the target rotational speed and in the target rotational direction.

The application relates to the field of water pump motor control, in particular to a water pump motor constant power control method and system, which comprises the following steps: controlling motor rotation, keeping the motor rotation direction constant, obtaining the absolute value of the average current of the motor during operation, judging whether the absolute value of the average current is greater than a preset current value, if yes, controlling the operation current of the motor to decrease so as to reduce the power of the motor, and if no, controlling the operation current of the motor to increase so as to increase the power of the motor. The application controls the rotation direction of the water pump to be the required direction and can keep the output power of the water pump constant, thus being convenient for people to use.

Redundant switching device with a first system circuit (L1) and a second system circuit (L2) of identical function in order to design the function redundantly, wherein the redundant switching device comprises: - a substrate (30, 310, 320) which is divided into a first region (A1) in which at least a part of the first system circuit (L1) is provided, and a second region (A2) in which at least a part of the second system circuit (L2) is provided, and has a surface, wherein both the first region (A1) and the second region (A2) have a printed wiring (P12, P13, P22, P23, P181, P182, P191, P192); - a first mounting component (IC1, MOS1) included in the first system circuit (L1), having three or more pins and being surface-mounted on one surface of the substrate (30, 310, 320); and - a second assembly component (IC2, MOS2) which is included in the second system circuit (L2), has an identical number of pins as the first assembly component (IC1, MOS1) and has an identical function as the first assembly component (IC1, MOS1) and is surface-mounted on one surface of the substrate (30, 310, 320), wherein - a placement of numbers assigned to the respective pins of the first assembly component (IC1, MOS1) according to function is defined as a first pin placement with respect to a center point (C1) of the first assembly component (IC1, MOS1); - a placement of numbers assigned to the respective pins of the second assembly component (IC2, MOS2) according to function is defined as a second pin placement with respect to a center point (C2) of the second assembly component (IC2, MOS2); - the second pin placement is a mirror image of the first pin placement; - the first system circuit (L1) and the second system circuit (L2) control the supply of electrical energy to a motor (80) having a rotating shaft (870); - the first system circuit (L1) and the second system circuit (L2) each comprise a power conversion circuit (120, 220) which converts a supplied electrical energy to output the converted electrical energy to the motor (80); - the first system circuit (L1) and the second system circuit (L2) each have a control circuit (170, 270, 176, 276) that controls an operation of the energy conversion circuit (120, 220); and - the first assembly component (IC1, MOS1) and the second assembly component (IC2, MOS2) each comprise an integrated circuit component (IC1, IC2) which is contained in the control circuit (170, 270, 176, 276).

The invention provides a motor unit and a motor controller thereof. The motor unit is provided with the motor controller and a motor. The motor controller comprises a switching circuit, a control circuit and a phase signal generating circuit. The phase signal generating circuit receives a phase input signal to generate a phase output signal to the control circuit. The control circuit firstly enables the phase output signal to maintain a first digital level in a first duration to drive the motor, so that a rotor is separated from a dead zone. And then the control circuit enables the phase output signal to maintain a second digital level in a second duration to drive the motor, so that the rotor is separated from the dead zone. The motor unit and the motor controller can make commutation smooth.

The invention provides an ultra-short period reciprocating motion control system and method for a cutter head of a planer. The system comprises a main control module, a driving control module and a signal feedback module which are connected in sequence, the driving control module and the signal feedback module are respectively connected with a motor for controlling the planer tool bit to reciprocate; the signal feedback module is used for acquiring real-time motion information of the motor and feeding back the real-time motion information to the main control module; the main control module is used for calculating the current speed of the motor according to the real-time motion information and determining a driving control strategy based on the current speed and a reciprocating motion instruction from a user; the drive control module is used for executing speed control and forward and reverse reciprocating motion on the motor based on the drive control strategy. When the planer is applied to an orthopaedic arthroscopic surgery, the cutting frequency in unit time can be effectively increased, so that the medical care requirement of efficiently cutting damaged tissues is met, the movement stability and accuracy of the planer tool bit can be ensured, and the surgery efficiency is greatly improved.

A method for operating a permanently excited synchronous motor of a hand-held working device includes the steps of: sensorlessly determining a position variable representative of a position of a rotor of the synchronous motor at a standstill; determining a direction variable for a continuous rotation of the rotor from standstill in a direction on the basis of the determined position variable such that an absolute value of an attainable torque that can be generated by the synchronous motor during its sensorless actuation for the rotation in the direction is greater than an absolute value of a breakaway torque limit of the working device; and sensorlessly actuating the synchronous motor on the basis of the determined direction variable for the rotation in the direction.

The utility model relates to a brushless direct-current motor, in particular to a brushless direct-current motor based on a brush control mode, and solves the technical problem that a brush motor in a shaped product cannot meet the long-service-life operation requirement in a high-altitude area or at a high altitude. According to the brushless DC motor based on the brush control mode provided by the utility model, the two non-inductive drivers with opposite connection directions of the positive and negative electrodes are arranged in the brushless motor body, the rotor of the brushless motor body is driven to rotate by adopting a non-inductive driving principle, and the corresponding non-inductive drivers are gated by utilizing the two diodes with opposite conduction directions, so that the brushless DC motor is driven to rotate. The purpose of changing the rotating direction of the motor by changing the positive and negative pole input directions of the power supply is achieved, the control mode is the same as the control mode of the brush motor, and lossless replacement of the brush motor can be achieved.

A differential amplifier provides improved signal swing and reduced common-mode output noise. The differential amplifier circuit includes a driver circuit with a first output for driving a first output of the differential amplifier and with a second output for driving a second output of the differential amplifier. The driver circuit has inputs for receiving a differential (complementary) pair of input signals at least one common-mode reference input for receiving a common-mode reference signal. The differential amplifier also includes a signal maxima detector having inputs for receiving the differential input signals that detects a maximum value between the individual signals, including any input common-mode voltage. The differential amplifier also includes a common-mode reference circuit that provides the common-mode reference signal and an input coupled to an output of the signal maxima detector, so that a common-mode voltage of the outputs is independent of power supply voltages provided to the driver circuit.

A phase angle detection system according to one aspect of the embodiment detects a phase angle of an electric motor in a drive system provided with a transmission unit that changes a rotation speed of the electric motor. The phase angle detection system includes a first sensor, a second sensor, and an arithmetic processing unit. The first sensor outputs a first signal for detecting at least a specific phase angle of a rotor of the electric motor. The second sensor outputs a second signal capable of detecting an amount of rotation of an output axis of the transmission unit. The arithmetic processing unit calculates, with an amount of deviation included in a result of the detection of a specific phase angle by the first signal defined for each rotational direction of the electric motor in advance, an estimated value of an absolute angle of the rotor of the electric motor using the amount of deviation of the first signal determined by a rotational direction of the electric motor, a result of the detection of the first signal, and the second signal.

The present invention rotates a rotor of an electric motor by sequentially switching between energization modes that designate, from among the three phases of the electric motor, two phases in which a pulse voltage is applied. The pulse voltage alternately generates first pulses for rotating the rotor in one direction and second pulses for rotating the rotor in the reverse direction, the second pulses having a polarity opposite to that of the first pulses. The energization modes are switched to one direction or the reverse direction on the basis of the comparison between a first threshold value and the value of a first open phase voltage resulting from the application of the first pulses and the comparison between a second threshold value and the value of a second open phase voltage resulting from the application of the second pulses. When switching to the reverse direction, the first threshold value is set on the basis of the value of the first open phase voltage and the first initial threshold value preset for each energization mode. When switching to the one direction, the second threshold value is set on the basis of the value of the second open phase voltage and the second initial threshold value preset for each energization mode.

An electric working machine in one aspect of the present disclosure includes: a motor; a driver to drive the motor; a first control circuit; and a second control circuit. The first control circuit controls the driver such that the motor rotates in a set rotation direction. The second control circuit is provided separately from the first control circuit. The second control circuit detects a rotation direction of the motor and performs an abnormality handling process to stop rotation of the motor in response to a situation where the detected rotation direction is reverse to the set rotation direction.