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Novel position sensor-free starting method for permanent-magnet synchronous motor

A permanent magnet synchronous motor and starting method technology, applied in the direction of controlling generators, motor generators, electromechanical brakes, etc., can solve the problems of reducing system reliability and adapting to extreme working conditions, increasing system volume, etc., to achieve Strong anti-interference ability, suppress system jitter, and improve smoothness

Pending Publication Date: 2020-12-04
力孚智能装备(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this kind of position sensor will increase the volume of the system, reduce the reliability of the system and the ability to adapt to extreme working conditions

Method used

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  • Novel position sensor-free starting method for permanent-magnet synchronous motor
  • Novel position sensor-free starting method for permanent-magnet synchronous motor
  • Novel position sensor-free starting method for permanent-magnet synchronous motor

Examples

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Effect test

no. 1 example

[0026] A novel method for starting a permanent magnet synchronous motor without a position sensor includes the following steps:

[0027] S1: Build a mathematical model of a permanent magnet synchronous motor;

[0028] S2: Under ideal conditions, the stator voltage equation of the PMSM projected on the dq axis is obtained through the stator voltage vector equation of the PMSM two-phase winding in the rotating coordinate system:

[0029] S3: The angle between the δ axis and the q axis in the mathematical model of the permanent magnet synchronous motor described in S1 Get the voltage equation in the γ-δ coordinate system:

[0030] S4: In the I / F algorithm, the γ-δ coordinate system is oriented according to the current vector, so i γ =0, then the voltage equation in the γ-δ coordinate system Simplified to And thus the electromagnetic torque formula of the permanent magnet synchronous motor is obtained:

[0031] S5: Calculate the position information of the rotor base...

no. 2 example

[0046] Overview of control logic through a single-chip microcomputer system:

[0047]After the MCU receives the starting command through CAN communication, the motor will work in the I / F control state of angle open loop and current closed loop; its position angle is given by the simulated shaft system, and a q-axis current reference is given according to the motor parameters Value; Since the I / F control simulates the acceleration process of the motor, the given cumulative value of the position angle in each control cycle will increase slowly to simulate the process of speed increase. At the same time, the sliding mode observer will also collect current and voltage information to calculate the position information of the motor and compare it with the given position angle; if the given speed of I / F control has reached the set maximum value (that is, the motor has has a certain initial speed), but the angle deviation still cannot meet the switching requirements, the I / F control w...

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Abstract

The invention provides a novel position sensor-free starting method for a permanent-magnet synchronous motor. The novel position sensor-free starting method comprises the following steps of S1, building a mathematical model of the permanent-magnet synchronous motor (PMMS); S2, under an ideal condition, acquiring a stator voltage equation of the projection of the PMSM on a dq axis through a statorvoltage vector equation of a two-phase winding of the PMSM under a rotating coordinate system; and S3, acquiring a voltage equation under a gamma-delta coordinate system based on a combination of thestator voltage equation and an included angle phi between a delta axis and a q axis in the PMSM mathematical model in the S1, wherein the equations are as defined in the specification. The novel position sensor-free starting method for the PMMS provided by the invention has the advantages that I / F control can be introduced at a zero speed and low speed of a motor so as to overcome the condition oflow observation accuracy of a sliding mode observer at the zero speed and low speed, and an optimization algorithm is stably switched to sliding mode control when the motor has a certain initial speed.

Description

technical field [0001] The invention relates to the technical field of new energy electric vehicles, in particular to a novel position sensorless starting method for a permanent magnet synchronous motor. Background technique [0002] With the maturity of new energy vehicle technology, the sales of electric vehicles have achieved explosive growth in recent years. As the main energy-consuming module of the electric vehicle system, how to make the air conditioner perform low-cost, high-efficiency and energy-saving work has become a research hotspot in recent years. Among them, the permanent magnet synchronous motor has the characteristics of small size, high power density, high torque inertia ratio, fast dynamic response, stable torque output, and low maintenance cost, so it is widely used in various fields of new energy vehicles. For the rotor position detection method necessary for the permanent magnet synchronous motor speed control system, modules such as photoelectric enc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/14H02P21/34H02P21/13H02P21/24H02P27/12H02P25/026
CPCH02P21/0007H02P21/14H02P21/34H02P21/13H02P21/24H02P27/12H02P25/026
Inventor 宋建国王炜
Owner 力孚智能装备(苏州)有限公司
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