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Judgment method for position sensorless control starting stalling of permanent magnet synchronous motor

A permanent magnet synchronous motor and sensor technology, applied in the direction of motor control, starting device, control system, etc., can solve the problems of motor loss of magnetism, power module damage, etc.

Pending Publication Date: 2021-12-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for judging the stalling of permanent magnet synchronous motor without position sensor control, so as to solve the existing problems in the prior art, such as motor stalling, current overshoot, motor demagnetization, power module damage, etc.

Method used

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  • Judgment method for position sensorless control starting stalling of permanent magnet synchronous motor
  • Judgment method for position sensorless control starting stalling of permanent magnet synchronous motor
  • Judgment method for position sensorless control starting stalling of permanent magnet synchronous motor

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Embodiment

[0057] The permanent magnet synchronous motor adopted in the experimental verification of the principle of the present invention is an outer rotor fan motor applied to automobile air conditioners, wherein the parameters of the permanent magnet synchronous motor are: rated power 300W, rated voltage DC 24V, minimum operating speed n set_min =500 rpm, the highest operating speed n set_max = 4200 rpm, number of pole pairs p n =4, stator resistance R=0.39Ω, stator direct axis inductance L d =0.09mH, quadrature axis inductance L q =0.11mH, back EMF coefficient K e =2.45V / krpm, the vector control PWM frequency is 16KHz.

[0058] Such as figure 1 A system control block diagram of the position sensorless vector control of the permanent magnet synchronous motor system in an embodiment of the present invention, including a dual-resistor sampling circuit, Clarke and PARK transformation, maximum torque current ratio control (MTPA), speed loop, dq axis current loop, PARK inverse transf...

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Abstract

The invention discloses a judgment method for position sensorless control starting stalling of a permanent magnet synchronous motor. The judgment method comprises the following steps: establishing a voltage equation of the permanent magnet synchronous motor under an actual rotation dq coordinate system; based on a voltage equation, under a preset consistent operation frequency, generating a three-phase sine wave current to form an active rotating magnetic field in two modes of taking a d-axis voltage as 0 and a q-axis voltage as a preset voltage and taking the d-axis voltage as the preset voltage and the q-axis voltage as 0, so as to make the motor normally operate in an open loop under the condition of no locked-rotor, and respectively calculating d-axis current and q-axis current of the motor in the two modes; and according to the relationship between the dq-axis current and the current preset value of the motor in the two modes, judging whether locked-rotor occurs at the starting stage of the motor. Whether the motor is in the locked-rotor state or not in the starting stage is judged by applying two groups of dq-axis voltage and analyzing the magnitude of the obtained current, and the problems of motor excitation loss, power module damage and the like caused by motor locked-rotor and current overshoot can be avoided.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method for judging a permanent magnet synchronous motor without a position sensor to control starting and stalling. Background technique [0002] Permanent magnet synchronous motors have been widely used in industrial control, home appliances and other fields due to their simple structure, high power density, high efficiency, and wide speed range. The position sensorless control technology of permanent magnet synchronous motors can reduce hardware costs and improve system reliability. In recent years, it has become a very important research direction in the field of motor control. For example, fan pump products are very suitable for position sensorless control solutions. [0003] Motor stalling means that the torque is still output when the speed is zero. Too much equipment load, the contact between the rotor and the stator is stuck, or the driving equipment is stuck and other reas...

Claims

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Application Information

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IPC IPC(8): H02P29/024H02P6/21
CPCH02P29/024H02P6/21
Inventor 童怀
Owner GUANGDONG UNIV OF TECH
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