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Sensorless starting control method of permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and control method, which is applied in the fields of motor control, motor generator control, electronic commutation motor control, etc.

Active Publication Date: 2020-05-05
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter which method is used to start, it is necessary to switch from a single current loop to a double-loop control mode of the speed and current. Since there are large differences in the motor current and rotor position angle before and after switching, even if a smooth switching method is used, the switching process cannot be avoided. Inrush current, unbalanced torque, etc., even switching failures

Method used

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  • Sensorless starting control method of permanent magnet synchronous motor
  • Sensorless starting control method of permanent magnet synchronous motor
  • Sensorless starting control method of permanent magnet synchronous motor

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Experimental program
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Embodiment 1

[0060] A sensorless starting control method of a permanent magnet synchronous motor of the present invention comprises the following steps,

[0061] Start-up phase: when the motor is at zero speed, the control method of pulse vibration high-frequency voltage injection is used to start the motor, and the rotor position angle and speed are collected to realize the double-loop control of the speed and current; when the motor is started, the motor parameters are collected and the sliding mode observer is run Algorithm to detect rotor position angle;

[0062] Switching stage: The motor enters the switching stage immediately after starting, and calculates the position angle difference Δθ detected by the control method of pulse vibration high-frequency voltage injection and the sliding mode observer algorithm, and compares Δθ with the set switching deviation Δθ err For comparison, when Δθ is less than Δθ err After switching, the angle of the sliding mode observer is used instead of ...

Embodiment 2

[0097] As shown in the figure, the rotor position angle is detected by the pulse vibration high-frequency voltage injection method, which specifically includes the following steps,

[0098] 1) Inject a high-frequency voltage signal into the direct axis of the estimated two-phase rotating coordinate system, and generate a high-frequency current under the excitation of the high-frequency voltage signal,

[0099] 2) The high-frequency current is transformed through coordinates and combined with the modulating signal sin(ω h t) is multiplied to obtain the high-frequency current component ω h is the phase of the high-frequency voltage signal,

[0100] 3) High-frequency current component The speed ω of the motor is obtained by low-pass filtering (LPF) and PI regulator r , where the control is zero, so that the error Δθ between the estimated value of the rotor position and the actual value gradually approaches 0, and then the estimated value of the rotor position angle can be...

Embodiment 3

[0138] Among them, the detected rotor angle is also included in the calculation of the real-time speed ω of the motor r To complete the step of speed adjustment, the described speed adjustment step is, the real-time speed ω r with set speed The deviation value is obtained by the speed PI regulator i q Reference value for current The current i of the motor is calculated by the Clarke and Park transformation q i d , current i q i d After the high-frequency current components are filtered out by a low-pass filter, they are compared with the reference value 0 value for comparison, the generated deviation value is then passed through the current PI regulator to obtain the given value of the voltage with The two are then subjected to park inverse transformation to generate a given voltage value with with It is the control signal of the three-phase inverter SVPWM, and the purpose of adjusting the motor speed is achieved by controlling the output of the inverter. ...

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Abstract

The invention discloses a sensorless starting control method of a permanent magnet synchronous motor. The method comprises the following steps: a starting stage: when the motor is at zero speed, starting the motor by adopting a pulse vibration high-frequency voltage injection control method; a switching stage: immediately entering the switching stage after the motor is started; and a running stage: detecting a rotating speed and a rotor position angle by adopting a sliding mode observer, completing rotating speed and current double-loop adjustment of the motor and a space vector algorithm, andcontrolling a three-phase inverter bridge to drive the motor to run. Under the novel starting control mode, the permanent magnet synchronous motor can smoothly complete rotating speed and current double-loop starting, under the condition that the rotating speed of the motor is extremely low, angle switching is automatically completed, the switching time is extremely short, no current impact or rotating speed fluctuation exists in the switching process, and the motor operates very stably.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a sensorless starting control method of a permanent magnet synchronous motor. Background technique [0002] Due to the advantages of high power density, excellent torque performance and easy maintenance, permanent magnet synchronous motors are widely used in servo systems, industrial control and other fields. Now many permanent magnet synchronous motors adopt position sensorless control mode. Although the motor cost and installation difficulty are reduced, and the reliability of the system is improved, the sensorless control mode also has certain limitations. [0003] The sensorless control method usually adopts the detection method of the sliding mode observer. Since the sliding mode observer calculates the rotor position angle by detecting the back electromotive force of the motor, the sliding mode observer cannot accurately estimate the rotor position when th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20H02P6/18H02P21/34H02P21/32H02P21/18H02P21/00
CPCH02P6/20H02P6/183H02P21/34H02P21/32H02P21/18H02P21/0007H02P2203/03H02P2203/11
Inventor 魏振姚广彭树文高亚男岳金磊
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND