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Position sensorless control method and device for permanent magnet synchronous motor

A permanent magnet synchronous motor and sensor technology, used in electronic commutation motor control, starting devices, control systems, etc., can solve the problems of poor starting reliability and reverse rotation of the motor, and achieve the effect of improving starting reliability.

Active Publication Date: 2018-11-30
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a control method and device for a permanent magnet synchronous motor without a position sensor, to at least solve the problem of poor reliability of motor start-up caused by possible reversal of the positionless control mode of the permanent magnet synchronous motor in the prior art

Method used

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  • Position sensorless control method and device for permanent magnet synchronous motor
  • Position sensorless control method and device for permanent magnet synchronous motor
  • Position sensorless control method and device for permanent magnet synchronous motor

Examples

Experimental program
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Embodiment 1

[0032] The position sensorless control method of the permanent magnet synchronous motor provided by the present invention will be described below with reference to the accompanying drawings.

[0033] figure 2 An optional flowchart showing the control method of the permanent magnet synchronous motor without a position sensor, such as figure 2 As shown, the method includes:

[0034]S102, when the motor is running in the first speed range, calculate the counter electromotive force by using an open-loop calculation method, and calculate the arc tangent of the d-axis and q-axis counter electromotive force of the motor according to the counter electromotive force, and determine the increment Δθ1 of the first position signal; preferably , the operation process corresponding to the operation in the first speed range is after the positioning or open-loop operation is completed during the motor starting process, that is to say, the motor is running at a low speed.

[0035] S104, com...

Embodiment 2

[0069] Based on the control method for the permanent magnet synchronous motor without a position sensor provided in the above embodiment 1, an optional embodiment 2 of the present invention also provides a control device for a permanent magnet synchronous motor without a position sensor, specifically, Figure 10 shows an optional structural block diagram of the device, such as Figure 10 As shown, the device includes: a first determining unit 10, which is used to calculate the counter electromotive force of the d-axis and the q-axis by using an open-loop calculation method when the motor is running in the first speed range, and according to the counter electromotive force of the d-axis and the q-axis The arc tangent of the first position signal to determine the increment Δθ1; the comparison unit 12 is used to compare the increment Δθ1 of the first position signal with the first preset increment Δθmin, wherein the first preset increment Δθmin is greater than 0; the first contro...

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Abstract

The invention discloses a sensorless control method and device of a permanent magnet synchronous motor. The method comprises the steps of calculating d-axis counter electromotive force and q-axis counter electromotive force in an open-loop calculation manner when the motor runs within a first speed range and determining an increment [delta]theta1 of a first position signal according to arc tangent of the d-axis counter electromotive force and the q-axis counter electromotive force; comparing the increment [delta]theta1 of the first position signal with a first preset increment [delta]thetamin, wherein the first preset increment [delta]thetamin is greater than 0; and if the [delta]theta1 is smaller than the [delta]thetamin, giving the value of the first preset increment [delta]thetamin to the increment [delta]theta1 of the first position signal and further controlling running of the motor. According to the sensorless control method and device of the permanent magnet synchronous motor, the problem of poor motor starting reliability caused by the conditions of reverse rotation and the like of the sensorless control method of the permanent magnet synchronous motor in the prior art is solved, and the motor starting reliability is improved.

Description

technical field [0001] The invention relates to the technical field of permanent magnet motor control, in particular to a control method and device for a permanent magnet synchronous motor without a position sensor. Background technique [0002] At present, variable frequency air conditioner compressors widely adopt the control method of permanent magnet synchronous motor without position sensor. The sensorless permanent magnet synchronous motor adopts an open-loop method to calculate the counter electromotive force at low speed, and obtains the arc tangent of the d-axis and q-axis counter electromotive force The incremental Δθ of the position signal is output; when a certain speed is reached, the counter electromotive force is calculated by the observer method, and the error angle Errθ between the assumed coordinate and the actual coordinate is obtained by calculating the arc tangent of the d-axis and q-axis counter electromotive force, and the error angle Errθ between the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/182H02P6/20
CPCH02P6/182H02P6/20
Inventor 黄翰庞伟宋德超
Owner GREE ELECTRIC APPLIANCES INC