145results about "Starter arrangements" patented technology

A power converter is configured to measure an output current and to determine a multiphase voltage reference as a function of the output current. Within the same switching period the voltage reference is determined, a modulation routine determines a modulation index for each phase of the output voltage. In some instances, one or more phases must start modulation during the switching period before the new modulation index is determined. The modulation routine stores the value of the modulation index generated from the prior switching period and uses the stored value when a new value is not yet ready. An offset value for the phase voltage which used a modulation index from the prior switching period is determined in order to compensate the phase voltages of the other phases and to maintain a desired line-to-line voltage output from the power converter.

A control method, control apparatus and control system for an electric motor, and a computer-readable storage medium are provided. The control method for an electric motor includes: acquiring an initial rotation speed and an initial rotation direction of an electric motor; determining a target start mode for the electric motor according to the initial rotation speed and the initial rotation direction; and according to the target start mode, controlling the electric motor to start. A target start mode, which most conforms to an initial rotation speed and an initial rotation speed direction of an electric motor, can be determined from a plurality of preset start modes, so as to control the electric motor to start.

A motor starting control method, device, and system, the method including: accumulating electrical parameter to obtain accumulated electrical parameter values, which are alternately assigned to a direct-axis electrical parameter and quadrature-axis electrical parameter; accumulating an angular increment to obtain accumulated values of a forced-driving angle; generating a control signal for a motor based on real-time values of the direct-axis electric parameter, quadrature-axis electrical parameter, and forced-driving angle; the control signal drives the motor; repeating said steps until the direct-axis electrical parameter or the quadrature-axis electrical parameter reaches a target electrical parameter, and then continuing accumulating to obtain the accumulated values of the forced-driving angle while forcibly driving the motor based on the corresponding control signal; when the real-time value of the forced-driving angle stays in sync with the rotor angle, the motor completes the startup; the motor is driven by alternately applying two perpendicular forces to the rotor.

The application provides a direct-current motor, a starting control method and device thereof, an air conditioner and a storage medium. The method comprises the following steps: detecting that the controller of the direct-current motor is powered on, obtaining an initial duty cycle corresponding to the direct-current motor pre-stored in the controller; when the initial duty cycle is zero, self-learning the initial duty cycle to obtain a target duty cycle; and controlling the starting of the direct-current motor according to the target duty cycle. The application obtains the target duty cycle, i.e. the optimal starting voltage of the direct-current motor, by self-learning the initial duty cycle when the initial duty cycle is zero, and controls the starting of the direct-current motor according to the target duty cycle when the starting instruction of the direct-current motor is received, so as to avoid the problems of excessive starting voltage or too small starting voltage, excessive starting vibration of the direct-current motor, speed overshoot and delay in starting of the motor, and the problem of poor control of the motor and the controller caused by replacement of the motor or the controller, thereby improving the stability and reliability of the direct-current motor during starting.

The invention discloses a high-power compressor driving circuit, a high-power compressor and a control method of the high-power compressor. The high-power compressor driving circuit comprises a controller, a three-phase half-bridge driving circuit, a three-phase half-bridge circuit and a direct current-direct current converter, the three-phase half-bridge driving circuit is connected with the controller; the three-phase half-bridge drive circuit is connected with the three-phase half-bridge circuit; the DC-DC converter is connected with the controller and the three-phase half-bridge drive circuit. Wherein the three-phase half-bridge circuit comprises 12 insulated gate bipolar transistors, each phase of the three phases of the three-phase half-bridge circuit comprises 4 insulated gate bipolar transistors, and the three-phase half-bridge circuit is used for driving the permanent magnet synchronous scroll compressor connected with the three-phase half-bridge circuit. The permanent magnet synchronous scroll compressor connected with the three-phase half-bridge circuit is driven in a double-tube parallel current expansion mode corresponding to the three-phase half-bridge circuit, the full-load load power of the permanent magnet synchronous scroll compressor can meet the driving refrigeration requirement of large equipment, the on-load overcurrent capacity is enhanced in the double-tube parallel current expansion mode, and the influence of the environment temperature is reduced.

One aspect of the present disclosure provides an electric power tool including a motor, a drive circuit, a voltage detector, a first calculator, and a second calculator. The drive circuit applies a power-supply voltage to the motor in accordance with a first duty ratio. The voltage detector detects a magnitude of the power-supply voltage. The first calculator calculates a desired duty ratio based on the magnitude of the power-supply voltage detected. The second calculator increases the first duty ratio from an initial value to the desired duty ratio in accordance with a lapse of time. The second calculator varies a rate of increase of the first duty ratio based on the magnitude of the power-supply voltage detected.

The application belongs to the field of integrated permanent magnet synchronous motor control system design, and particularly relates to an integrated permanent magnet synchronous motor open loop-closed loop switching control method and a control system. The open loop control is designed at the same time as starting the closed loop calculation. When the open loop output speed reaches the open loop-closed loop switching speed and the closed loop control output target speed reaches the open loop-closed loop switching speed, the open loop control is switched to the closed loop control, and the motor is controlled in the closed loop mode, so that the motor control speed fluctuation is small, the speed following property is good, and the switching process is smooth.

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 present invention refers to a starting method with two-levels modified and discrete fixed-time or fixed-frequency hysteresis current controller, under high load conditions, of a BLDC motor (10) with trapezoidal-shaped induced voltages, wherein the BLDC motor (10) is driven by an inverter bridge (30) with only one current sensor (20) positioned in the busbar, controlled by means of a processing unit associated to an analog-digital converter, wherein the novelty basically comprises the fact that: the intensity of the BLDC motor current (Im) is controlled by means of the two-levels and discrete fixed-time or fixed-frequency hysteresis current controller.

The utility model discloses a single-phase brushless motor time-delay starting operation module, which mainly comprises a brushless motor main body and a matched control assembly, and comprises two 41F type Hall sensors which are connected in parallel, a common pull-up resistor and the like. The two Hall sensors are symmetrically installed on the two sides of the geometric center line of a stator magnetic pole, the detection faces face a rotor permanent magnet, high and low levels are output through induction of rotor magnetic pole changes, the H-bridge power tube is controlled, and stator coil power supply state switching is achieved. During working, according to the characteristics of the Hall sensor, the motor is controlled to be started and run according to the principle that the motor is firstly turned off and then turned on, and the dead time control unit generates 0.5-2 ms power tube switching delay. According to the module, the starting success rate of the motor is greatly improved, the starting failure risk is effectively reduced, and the vibration amplitude in the starting process is obviously reduced. In the operation stage, the motor efficiency is remarkably improved, and the rotating speed fluctuation is extremely small when the load changes. Moreover, the circuit design of the module is simplified, so that the hardware cost is greatly reduced.

This invention relates to the field of brushless motor technology, and discloses a brushless motor system and control method, including a sampling module; a hybrid observer for real-time sampling of motor terminal voltage, line current, and current slope, and predicting rotor position using an adaptive algorithm; a dynamic commutation compensation module for real-time detection of motor line current and back EMF waveforms, and adjustment of commutation angle and PWM duty cycle; an adaptive controller responsible for signal processing, adaptive startup, and PWM generation; and an inverter for driving the brushless motor according to the PWM control signal. This invention achieves high-precision rotor position estimation under sensorless conditions through a hybrid observer design. The hybrid observer integrates back EMF detection and current slope estimation, effectively compensating for noise caused by freewheeling current, eliminating phase lag and chattering caused by the low-pass filter in traditional sliding mode observers, and improving the accuracy of rotor position information.

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 relates to the technical field of industrial automation and motor control, discloses a wide-temperature starting method and system for an industrial internet brushless motor, and aims to solve the problems of starting parameter mismatch, stalling or torque oscillation caused by physical delay of a temperature sensor and a reactive control strategy in the prior art. The method comprises the following steps: collecting thermal state and electric state data of a motor in real time, and constructing a multi-dimensional time sequence characteristic matrix; predicting a future temperature trajectory through an eight-bit integer quantization LSTM model deployed at an edge end; a global thermal environment early warning instruction issued by the cloud is fused, and a corrected temperature track is generated; based on the track, calculating an optimal starting control parameter by using a motor physical parameterization model and executing starting; and after starting is completed, uploading a data log for iteration of the cloud model. According to the application, the starting reliability and the control performance of the brushless motor in a wide temperature range are remarkably improved through an edge cloud collaborative zero-lag temperature prediction and prospective parameter generation mechanism.

The present invention provides a computer-implemented method for starting a hydrogen recirculation blower in a fuel cell system, comprising an electric drive motor, the electric drive motor comprising a rotor and a stator, comprising the steps of: receiving a start signal for the electric drive motor; acquiring a temperature signal indicative of a temperature in the hydrogen recirculation blower after receiving the start signal; assigning the temperature signal to a defined temperature range; defining the temperature range; selecting a temperature range-specific set of parameters for carrying out a signal injection method to determine the position of the rotor in the electric drive motor; carrying out the signal injection method with the parameters of the selected set of parameters; and determining the rotor position.and commissioning of the electric drive motor as well as a hydrogen recirculation blower with an electric drive motor and a hydrogen-based fuel cell system with a hydrogen recirculation blower.;

The invention relates to a method for controlling a brushless direct-current electric motor (1), said electric motor (1) comprising: a rotor (3) having permanent magnets (9); a stator (5) having electromagnetic excitation coils; at least one Hall effect sensor (17), preferably a single Hall effect sensor, designed to detect predetemined angular positions of the rotor (3); means for measuring an electrical variable in the region of at least one coil, said electrical variable varying according to the position of the rotor (3), the method comprising the following steps for starting the electric motor (1): the electrical variable in the region of at least one coil is measured using the measuring means (102); the position of the rotor is determined on the basis of the measured value of the electrical variable (103); a predetermined excitation signal associated with the determined position of the rotor (104) is applied; and then a predetermined sequence of excitation signals is applied at each change of state of the Hall effect sensor (17) (105).

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 application relates to the technical field of motor control, in particular to a starting state detection method and starting method of a direct current motor. The starting state detection method comprises the following steps: acquiring back electromotive force and a Hall signal of the direct current motor; in response to a jump of the Hall signal, acquiring the polarity of the back electromotive force and the Hall signal with the maximum absolute value in the last Hall signal period; and judging the starting state of the direct current motor based on the polarity of the back electromotive force with the maximum absolute value in the last Hall signal period and the polarity of the Hall signal. The method can accurately and efficiently detect the forward and reverse wind states of the direct current motor.

A drive system according to an aspect of the embodiment includes a first phase estimation unit, a second phase estimation unit, a state determination unit, and a drive control unit. The first phase estimation unit generates a first phase obtained by estimating a phase of a rotor on the basis of an initial phase at a startup stage of the synchronous motor. The second phase estimation unit generates a second phase obtained by estimating the phase of the rotating rotor on the basis of the operation state of the synchronous motor. The state determination unit determines the operation state of the synchronous motor. The drive control unit controls the driving of the synchronous motor by using any one of the first phase and the second phase according to the determination result of the operation state of the synchronous motor. The first phase estimation unit corrects the first phase by using the detection result of the rotor position detected from the start of the startup procedure of the synchronous motor to the successful startup.

A method for starting an energy generation network, in particular a farm network of a wind farm, wherein the energy generation network is connected at least at one network connection point to an electrical supply network, and wherein the energy generation network, in a normal operating mode, exchanges electrical power with the electrical supply network via the network connection point, said method comprising the following steps: selecting a build-up mode different from the normal operating mode when the electrical supply network experiences a voltage drop and / or the power supply network is separated from the electrical supply network, and operating the energy generation network in the build-up mode, wherein in the build-up mode at least one voltage-impressing means, in particular a voltage-impressing wind power plant, provides an energy generation network voltage, in particular a wind farm network voltage, and at least one initial supply means, in particular a current-impressing wind power plant, synchronises with the energy generation network voltage provided by the voltage-impressing means, and the voltage-impressing means and the initial supply means in total provide an electrical power in the energy generation network at the level of an inherent need of the energy generation network.

A cutting tool includes: an electric motor with a stator having multiple windings and a rotor; a driver circuit electrically connected to the electric motor to drive the electric motor to run; and a controller configured to estimate the angular position of the rotor based on a working parameter of the electric motor and output a drive signal to the driver circuit based on the angular position of the rotor to control the rotation of the electric motor. At a start stage, the controller is configured to: when an abnormal start of the electric motor is detected, output a first control instruction to control the electric motor to restart, where the first control instruction includes at least the instruction to input a high-frequency signal into the driver circuit so as to acquire the angular position of the rotor.

The embodiment of the application discloses a motor starting automation detection device and method. The method is applied to a motor starting automation detection device, and the motor starting automation detection device comprises a control device, a stepping motor, a fan blade fixing device and a rotor connecting device. The method comprises the following steps: when a measured motor is in a power-on state, the measured motor is controlled to be powered off; the fan blade fixing device is controlled to be powered on; the rotor connecting device is controlled to be powered on; the fan blade fixing device is controlled to be powered off, and whether the power-off times of the measured motor are less than a preset power-off times threshold value is judged; if the power-off times are less than the power-off times threshold value, the second rotor is controlled to rotate a target step number which is the same as the power-off times; the rotor connecting device is controlled to be powered off, the measured motor is controlled to be powered on, the power-off times are updated, and the step of controlling the measured motor to be powered off when the measured motor is in the power-on state is executed until the power-off times are greater than the power-off times threshold value.

The invention belongs to the technical field of phase modifier control, and particularly relates to a system suitable for starting a phase modifier and a control method.The system comprises a brushless doubly-fed motor or a doubly-fed motor coaxially connected with a high-capacity phase modifier, and the motor comprises a set of high-voltage windings and a set of low-voltage windings; the high-voltage winding and the low-voltage winding are respectively connected with a high-voltage power grid and a low-voltage power grid through contactors; the contactor connected with the low-voltage winding is connected with an inversion unit of a low-voltage four-quadrant frequency converter, and the inversion unit of the low-voltage four-quadrant frequency converter is connected with a step-down transformer. The method aims to assist in solving a series of problems existing in the turning, starting and synchronous grid connection processes of the current high-capacity phase modifier, and meanwhile, corresponding control strategies are formulated according to working conditions such as restarting at any rotating speed in the turning, static state starting and stopping processes of the phase modifier, so that the reliability of a phase modifier system is improved.

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

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.

Method (10) for correcting the rotational position of an electric motor (12), in particular during starting, comprising the following steps Providing the electric motor (12) which has a stator (14) and a rotor (16) which is rotatable relative to the stator, Rotary operation (18) of the electric motor (12) by control via at least one electrical operating variable (B) and thereby rotary movement (20) of the rotor (16) relative to the stator (14), first speed measurement (26) of a first angular velocity (ω1) of the rotor (16) at least dependent on a phase voltage (u q ) with respect to a q-direction of the rotor-fixed dq coordinate system of the electric motor (12), second rotational speed measurement (28) of a second angular velocity (ω2) as a temporal change of an angular position (γ) detected by an angular position measurement (30). f ) of the rotor (16), Correction step (35) with which a 180° angle correction (36) of the detected angular position (γ) f ) depending on the first and second angular velocities (ω1, ω2).

A motor control device that can use a sensor input circuit that has a low response speed. The motor control device comprises a first magnetic pole position detection unit, a second magnetic pole position detection unit, and a control unit. The first magnetic pole position detection unit detects the pre-rotation position of a magnetic pole of a rotor based on detection results from a magnetic pole sensor. The second magnetic pole position detection unit detects the position of the magnetic pole of the rotor based on the current flowing in a plurality of drive windings that drive the rotor. The control unit performs control that makes the rotor start rotating based on detection results from the first magnetic pole position detection unit and control that makes the rotating rotor rotate based on detection results from the second magnetic pole position detection unit.

A motor driver for setting duty cycles based on a temperature is provided. The motor driver senses a temperature of an environment around a motor. The motor driver sets a duty cycle modulation value according to the sensed temperature, and modulates a preset duty cycle to form a startup duty cycle according to the duty cycle modulation value. The motor driver sets or modulates duty cycles of one or more waveforms of a startup signal to be equal to the startup duty cycle. The motor driver outputs the startup signal to the motor.