14 results about "Motor constants" patented technology

The invention discloses a motor constant speed control method for an electric tractor, and relates to the technical field of line construction, and the method comprises the steps: a tension detection module which collects a tension signal of a wire in the paying-off operation of a high-voltage transmission line in real time; the frequency identification module is electrically connected with the tension detection module and is used for performing frequency domain analysis on the tension signal and identifying a periodic disturbance frequency corresponding to tension fluctuation; the self-adaptive control module comprises a sliding mode controller, and the sliding mode surface design of the sliding mode controller is combined with the periodic disturbance frequency, and a sliding mode control signal is generated based on a traction machine motor rotating speed feedback signal and a rotating speed instruction signal. The sliding mode controller is combined with disturbance frequency design, the anti-interference capacity is high, even if external disturbance exists, constant-speed operation of a traction machine motor can be maintained, paying-off speed fluctuation is reduced, the straightness and tension consistency of wire laying are guaranteed, the operation risk is reduced, the overall efficiency is improved, and stable constant-speed and tension control is achieved; and the manual intervention and fault shutdown times are reduced.

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 discloses a motor constant-speed starting method based on vector control. The motor constant-speed starting method comprises the steps that an electrical starting process is set to be an open-loop control stage, a semi-closed-loop control stage and a closed-loop control stage; in the open-loop control stage, the amplitude of the alpha-axis driving voltage V alpha op and the amplitude of the beta-axis driving voltage V beta op are gradually increased, and when the rotating angular speed of the open-loop driving voltage exceeds a preset closed-loop cutting speed threshold value, a semi-closed-loop control stage is started; in the semi-closed-loop stage, the climbing current is linearly increased to the last driving current Idrv applied in the open-loop stage and then enters the closed-loop control stage, and in the closed-loop control stage, a current loop takes Iqspd output by a speed loop as a torque current target value, and a driving voltage is generated through closed-loop control to drive a motor to operate.

A method for adjusting the clamping force exerted by an electromechanical brake of a motor vehicle, the brake including an electric motor provided with a rotating shaft which is intended to drive a mechanical brake-application mechanism, the electric motor being controlled by a PWM-type voltage controller, in which the rotational speed of the motor is estimated from an estimate of the motor resistance and an estimate of the motor constant, and then the clamping force is determined from the estimate of the rotational speed of the motor, wherein the estimate of the motor resistance is updated during an inactive phase with no voltage control.

The application discloses a constant power control method of a coal mining machine, and comprises the following steps: calculation of a single motor constant power influencing factor, calculation of a multi-motor constant power deceleration value, and determination of a deceleration mode. Real-time monitoring of the operation of the equipment is realized through intelligent means, important parameters of the operation of the equipment are collected at any time, and the traction speed of the coal mining machine is automatically adjusted by relying on the parameters, so that the safety and reliability of the operation of the equipment are ensured, the maintenance cost of the equipment is reduced, and the work efficiency is improved.

The application discloses a kind of brushless doubly-fed motor natural synchronization operating condition operation characteristic analysis method, comprising: based on the frequency conversion of brushless doubly-fed motor winding, obtain the winding loop voltage equation of brushless doubly-fed motor natural synchronization operating condition;Based on the winding loop voltage equation of brushless doubly-fed motor natural synchronization operating condition, equivalent circuit is deduced and solved;On the basis of equivalent circuit solving result, the power angle of brushless doubly-fed motor is calculated, and then the active output characteristic, electromagnetic torque and excitation characteristic of brushless doubly-fed motor are obtained.The present application can clearly analyze the maximum output power and static performance of brushless doubly-fed motor under the excitation of brushless doubly-fed motor constant voltage source, effectively solve the problem that traditional brushless doubly-fed motor equivalent circuit cannot accurately analyze natural synchronization operating condition operation, and provide a theoretical analysis basis for brushless doubly-fed motor control winding DC excitation control mode.

This invention discloses a smooth switching control method and device for a dual-winding reconfigurable permanent magnet synchronous motor, relating to the field of motor control technology. The invention effectively divides the dual-winding reconfigurable permanent magnet synchronous motor into multiple unit motors, converting the system current loop controlled variable into unit motor currents through variable gain. When the motor winding state switches, the PWM duty cycle signal is controlled by adjusting the variable gain: when the winding state switches from parallel to series, the terminal voltage of the original motor after the switch is increased to n times that in parallel; when the winding state switches from series to parallel, the terminal voltage of the original motor after the switch is reduced to 1 / n of that in series. This control process strictly maintains the direct and quadrature axis currents of the unit motors before and after the switching when the windings switch between series and parallel, thereby keeping the total output torque of the original motor constant, completely eliminating system speed fluctuations, and achieving smooth and seamless switching of the dual-winding reconfigurable permanent magnet synchronous motor.

The invention discloses a self-adaptive prediction correction method and system for the position of a motor rotor, and belongs to the technical field of motor driving control. The method comprises the following steps: firstly, acquiring rotor positions of a motor in current and historical multiple control periods; then, a first prediction position is calculated in parallel based on the motor constant speed state according to the latest two period positions, and a second prediction position is calculated based on the motor constant acceleration state according to the latest three period positions; according to the prediction errors of the two states in the previous period, the adaptive weight coefficient of the current period is dynamically calculated; and finally, the corrected rotor position is obtained through weighted fusion. Through a double-model adaptive fusion mechanism, high-precision position prediction is realized in a full working condition range, position detection lag caused by control delay is effectively overcome, a d-q axis decoupling effect is remarkably improved, current oscillation and torque ripple are inhibited, and dynamic performance and operation stability of a motor control system are comprehensively improved.

A real-time simulation device (1) is used for verifying a control system of a motor control device (3) that controls a motor. The real-time simulation device (1) comprises: an inverter simulation unit (20) that simulates an operation of an inverter and calculates a voltage signal of a voltage output from the inverter on the basis of a switching signal output from the motor control device; and a motor simulation unit (10) that simulates an operation of the motor in the state of open failure on the basis of a failure switching signal, calculates, on the basis of the voltage signal, a current signal of a current flowing through the motor when the motor fails, and outputs the current signal to the motor control device. The motor simulation unit includes: a motor resistance calculation unit that calculates a motor resistance, which is the resistance of the motor corresponding to the failure switching signal, on the basis of a motor constant representing the characteristics of the motor, a calculation cycle of the real-time simulation device, and the failure switching signal; and a motor current calculation unit that calculates a current signal on the basis of the voltage signal, the motor constant, the calculation cycle, and the motor resistance and outputs the current signal to the motor control device.

The invention relates to a wind friction loss suppression method for a high-voltage magnetic suspension motor, and the method comprises the steps: collecting three-phase input voltage, current, active power and reactive power, correcting the copper loss in real time, and calculating the constant loss Pcon of the motor; measuring a wind friction torque Tfw and a mechanical friction torque Tme in a normal pressure and vacuum environment, and converting wind friction loss Pfw and mechanical friction loss Pme; the no-load iron loss PFe is calculated through the formula PFe = Pcon-Pfw-Pme; and based on a coupling correlation curve of PFe and Pfw, the suspension air gap length delta of the magnetic suspension bearing and the axial speed v of cooling air are adjusted, and wind friction loss is restrained. Through the integrated suppression method, wind friction loss and mechanical friction loss are accurately separated, the loss evaluation accuracy is improved, the suspension air gap length, the rotor surface roughness and the cooling air speed are cooperatively optimized, systematic suppression of the wind friction loss is achieved, the loss and temperature rise are remarkably reduced, the operation efficiency and reliability of the motor are improved, and the method has engineering application value.

The application provides a harmonic injection method and device, the method comprising: obtaining original state data by testing motor vibration noise in a motor constant torque acceleration test mode under a whole vehicle state; obtaining phase sweep test results by testing motor vibration noise of specific order torque fluctuation corresponding harmonic current in the motor constant torque acceleration test mode under the whole vehicle state; comparing and analyzing the phase sweep test results and the original state data to obtain comparison and analysis results; determining optimal harmonic current information according to the comparison and analysis results; and generating current Map diagrams of different rotating speeds of the motor under each torque condition in the form of linear interpolation according to the optimal harmonic current information. It can be seen that the method can effectively reduce the specific order vibration noise problem of the motor, and the process is simple, the cycle is short, and no additional cost is increased.

To provide a method for determining a motor constant of an electric machine.SOLUTION: Provided is a method for determining a motor constant (Km) of an electric machine (7), in particular the electric machine (7) of an actuator assembly (6). At least one excitation signal (Im) having at least one direct current component (I0) and one alternating current component (Ik) is preset. The machine (7) is drive-controlled using the excitation signal (Im). At least one actual value of a motor current of the machine (7) and one actual value of a rotation rate (ω) of a rotor shaft of the machine (7) are determined in each case. The motor constant (Km) is determined according to the excitation signal (Im) and the actual values.SELECTED DRAWING: Figure 1

The present invention provides a method for determining the position-dependent motor constants of an electromagnetic motor comprising a magnet assembly and a coil assembly configured to be displaced relative to each other in the direction of motion, the method comprising: displacing the magnet assembly relative to the coil assembly along a predetermined trajectory of interest at a substantially constant speed in the direction of motion; applying a disturbance having a predetermined frequency to the electromagnetic motor during the displacement of the magnet assembly relative to the coil assembly; determining the position error of the magnet assembly relative to the coil assembly and the electromagnetic motor force along the predetermined trajectory of interest; and determining the position-dependent motor constants of the electromagnetic motor along the predetermined trajectory of interest based on the determined position error and electromagnetic motor force.

To provide a motor controller capable of simply and highly accurately identifying a motor constant and a control gain required for vector control based on a motor current.SOLUTION: When a first motor driving signal VSP is inputted after a control power source VCC is inputted, the identifying operation of a motor constant and a control gain is executed. As the identification operation, a first step of identifying the armature winding resistance "Ra", the d-axis inductance "Ld", and the q-axis inductance "Lq", a second step of calculating the current PI control gain and the Ke estimation gain (counter electromotive force estimation gain) using the identification result of the first step, a third step of calculating the counter electromotive force constant "Ke" using the identification results of the first step and the second step, and a fourth step of identifying the speed PI control gain and the θ e estimation gain (rotor position estimation gain) using the identification result of the first step are sequentially executed.SELECTED DRAWING: Figure 4