42results about "Rotation direction control" patented technology

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.

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 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).

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°.

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.

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.

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 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.

One embodiment provides a remotely controllable gas engine replacement device (10) comprising: a housing (14); a battery receptacle (54) coupled to the housing (14), the battery receptacle (54) configured to removably receive a battery pack (50); a motor (36) located within the housing (14); a power output shaft (38) that receives torque from the motor (36) and protrudes from a side of the housing (14); a power switch network (310) configured to selectively provide power from the battery pack (50) to the motor (36); and one or more remote control device interfaces (152) configured to communicate with a remote control device (150). The remotely controllable gas engine replacement device (10) further comprises an electronic processor (302) coupled to the power switch network (310) and the remote control device interface (10). The electronic processor (302) is configured to control the power switch network (310) to cause the motor (36) to rotate, receive control signals from the remote control device (150), and perform responsive actions to the control signals from the remote control device (150).

A crossing gate mechanism comprises an electric brushless direct current (BLDC) motor which has at least one internal sensing device that is used as a closed feedback loop to determine a position of the BLDC motor and accurately control a speed of the BLDC motor, a crossing gate arm operated via the BLDC motor and a digital control system configured to control operation of the BLDC motor, wherein the digital control system is configured to provide a motor control signal that results in a soft start motion and a soft stop motion of the crossing gate arm. The BLDC motor is controlled by a state-machine logic stored within a Field-Programmable Gate Array / a central processing unit such that the state-machine logic finely controls an acceleration and a deceleration of the BLDC motor that provides a relatively smooth operation of the crossing gate arm when it reaches both horizontal and vertical positions.

A stand-alone motor unit may include a housing. A stand-alone motor unit may include an electric motor. A stand-alone motor unit may include a battery pack to provide power to the motor. A stand-alone motor unit may include a battery receptacle arranged on the housing and configured to receive the battery pack. A stand-alone motor unit may include a throttle disposed on the housing, the throttle in communication with the electric motor and operable to adjust a parameter of the motor. A stand-alone motor unit may include a mode selector disposed on the housing, the mode selector movable between a first position, in which the motor operates in a first mode, and a second position, in which the motor operates in a second mode that is different than the first mode.

The utility model discloses a brushless motor driver circuit system based on an airborne environment. The brushless motor driver circuit system comprises a main control circuit, a driving circuit, a power circuit, an analog signal acquisition circuit and a multi-source control circuit, one end of the analog signal acquisition circuit is connected with the power circuit, and the other end of the analog signal acquisition circuit is connected with the master control circuit; the output end of the main control circuit is connected with the driving circuit; the output end of the driving circuit is connected with the power circuit; the power circuit is connected with the brushless motor; the multi-source control circuit is used for supplying power, one end of the multi-source control circuit is connected with the main control circuit, and the multi-source control circuit sends a power control signal to the main control circuit to enable the main control circuit to select a power mode so as to control forward rotation, reverse rotation and emergency response of the brushless motor. According to the scheme, corresponding motor functions can be realized by supplying corresponding 28V voltage to the forward power signal end, the reverse power signal end and the emergency power signal end.

In some examples, a method 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. One or more aspects of the method may be performed during dead time.

The multi-system motor control device includes a first motor drive circuit, a second motor drive circuit, a first electronic control unit, a second electronic control unit, and a rotation angle sensor. In addition, the motor control device is provided with a second measuring unit, and the second measuring unit measures the induced voltage generated in the stator winding of the second system of the brake motor. The first electronic control unit energizes the stator windings of the first system, drives the rotor, and generates an induced voltage through the stator windings of the second system. The second electronic control unit corrects the origin of the rotation angle sensor on the basis of the induced voltage waveform measured by the second measurement device at that time.

The invention provides an air conditioner and a control method of a motor of the air conditioner. Wherein the motor is a direct-current brushless motor and is provided with an input control port, and the control method comprises the steps that a regulation and control signal sent by an upper computer is received through the input control port, and the regulation and control signal comprises at least two signal sections; the regulation and control signals are recognized, regulation instructions in each signal section are obtained, and the regulation instructions comprise direction regulation instructions and speed regulation instructions; adjusting the rotation direction of the motor according to the direction adjusting instruction and adjusting the rotation speed of the motor according to the speed adjusting instruction. The motor has the advantage that direction adjustment and speed adjustment of the motor can be realized on the premise that the design cost is not increased.

A multi-system motor control device includes a first motor drive circuit, a second motor drive circuit, a first electronic control section, a second electronic control section, and a rotation angle sensor. Additionally, the motor control device includes a second measuring unit configured to measure an induced voltage generated in a stator winding of a second system of a brake motor. The first electronic control section supplies current to a stator winding in the first system to drive a rotor (a rotating element), thereby generating the induced voltage in the stator winding of the second system. The second electronic control section corrects the origin point of the rotation angle sensor based on a waveform of the induced voltage measured by the second measuring unit at that time.

A bidirectional motor (36) for a gas engine replacement device (10). One embodiment provides a gas engine replacement device (10) comprising a housing (14), a battery receptacle (54), a motor (36), a power output shaft (38) that receives torque from the motor (36), a power switch network (310) configured to selectively provide power to the motor (36), and an electronic processor (302) coupled to the power switch network (310). The electronic processor (302) is configured to cause the motor (36) to rotate in a first direction and receive an input to switch a direction of rotation of the motor (36). The electronic processor is further configured to control the power switch network (310) to cause the motor (36) to stop and cause the motor (36) to rotate in a second direction after controlling the power switch network (310) to cause the motor (36) to stop.

This invention belongs to the field of motor control and discloses a method for re-energizing a permanent magnet synchronous motor with speed control based on two-phase terminal voltage detection. The method includes: acquiring arbitrary two-phase terminal voltages to reconstruct the line back electromotive force (EMF) and deriving the phase relationship between the line back EMF and the A-phase back EMF; filtering the reconstructed line back EMF and constructing orthogonal signal pairs of the line back EMF; using the orthogonal signal pairs of the line back EMF as input to a phase-locked loop (PLL) to extract the phase and frequency of the line back EMF and obtain the motor's position and speed; if the amplitude of the line back EMF is less than an amplitude threshold, switching to normal start mode; otherwise, if the motor rotates in reverse, switching to reverse speed control re-energizing mode; if the motor rotates forward, switching to forward speed control re-energizing mode. This invention reduces hardware costs and complexity, and decreases the number of analog sampling pins occupied by the microcontroller's ADC. It reduces noise and dependence on current sampling accuracy, enabling rapid and accurate monitoring of the motor's speed and position information.

A driving device of a treadmill includes a roller, a servo motor, and a controller. The servo motor 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. The treadmill includes a running platform, a wear-resisting plate arranged on an upper side of the running platform, a belt wrapped around the roller and the running platform, and the driving device. The roller in the driving device is in transmission connection with the belt.

A brushless direct current motor drive circuit comprises a power supply circuit, a control unit DSP, a brushless direct current motor drive chip, a commutation circuit, a speed regulation circuit, a current detection circuit and a three-phase brushless direct current motor. The I / O port of the control unit DSP outputs high and low level signals to the driving chip for controlling forward rotation and reverse rotation of the three-phase brushless direct current motor; a PWM port of the control unit DSP outputs a PWM signal with fixed frequency and adjustable duty ratio to control the starting, stopping and rotating speed of the three-phase brushless direct current motor; a logic circuit in the driving chip generates commutation logic according to a Hall sensor signal in the three-phase brushless direct current motor and high and low level signals of the control unit DSP; a driving circuit in the brushless direct current motor driving chip realizes starting, stopping and rotating speed control of the three-phase brushless direct current motor according to the PWM signal duty ratio of the control unit DSP; the current monitoring circuit collects a voltage signal which is output by the brushless direct current motor driving chip and is output in proportion to the current of the three-phase brushless direct current motor.

An electronic device according to an embodiment of the present disclosure may comprise: a memory for storing instructions; a first housing; a second housing disposed to be able to move in a first or second direction with regard to the first housing, the second housing overlapping at least a part of the first housing; a flexible display mounted at least partially on the surface of the second housing such that at least a part of an externally exposed area thereof is reduced or expanded on the basis of the movement of the second housing; a motor for driving the second housing so as to move in the first or second direction; a drive circuit for controlling the driving of the motor; and a processor. The instructions may be configured to cause, when executed by the processor, the electronic device to: transmit a motor driving signal for driving the motor to the drive circuit upon receiving a trigger signal related to reduction or expansion of the flexible display; calculate the distance of movement of the second housing or the flexible display on the basis or the rate of rotation of the motor and the time of operation thereof while the motor operates on the basis of the motor driving signal; and initialize the calculated distance of movement upon acquiring a signal related to the position of the second housing or the flexible display.

A method includes receiving a sine feedback signal and a cosine feedback signal from a resolver coupled to an output shaft of an electric motor. Rectified sine and cosine signals are generated by sampling the feedback signals. A direction of rotation of the output shaft is determined using the feedback signals and the rectified signals. The rectified sine signal and the rectified cosine signal are converted into a signed sine signal and a signed cosine signal, respectively, using information associated with the direction of rotation. A speed of rotation of the output shaft is determined using the signed sine signal and the signed cosine signal. The direction and the speed of rotation are compared to a respective direction and a respective speed determined by a resolver-to-digital converter. The electric motor is operated based on the comparison.