Optional rotation speed quick starting method for permanent magnet synchronous motor

A permanent magnet synchronous motor, fast start technology, applied in the direction of control generator, motor generator control, control electromechanical brake, etc., to achieve the effect of improving estimation performance, fast switching, and suppressing influence

Inactive Publication Date: 2016-07-27
BEIJING HONGHUI INT ENERGY TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are based on the current model of the motor to estimate the angular position. When the motor is switched from the power generation mode to the electric mode, the current rapidly decreases to zero. At this time, the current model has no output and the angular position cannot be estimated by the above method.

Method used

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  • Optional rotation speed quick starting method for permanent magnet synchronous motor
  • Optional rotation speed quick starting method for permanent magnet synchronous motor
  • Optional rotation speed quick starting method for permanent magnet synchronous motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for quickly starting a permanent magnet synchronous motor at any speed, characterized in that: the method includes seven steps, the first step is to measure the current speed n of the mechanical angular velocity of the motor by a Hall sensor installed on the rotor side of the permanent magnet synchronous motor mech r / min; the second step is based on the speed information n in the first step mech Find the electrical frequency The unit is Hz, where p is the number of pole pairs of the motor stator;

[0028] In the third step, the electrical frequency f obtained in the second step is elec Input to the ramp function unit to generate the analog angle θ sim = f elec *t; where t is the amount of time;

[0029] The fourth step is based on the simulated angle θ in the third step sim Carry out single current closed-loop control, generating frequency f elec The three-phase sine wave current keeps the motor stable at the current speed;

[0030] The fifth step is to...

Embodiment 2

[0034] A method for quickly starting a permanent magnet synchronous motor at any speed described in Embodiment 1, the specific implementation steps of the extended sliding mode observer in the fifth step are as follows:

[0035] The first step is to establish the mathematical model of the current and back EMF under the α-β system of the permanent magnet synchronous motor: e α = -λωsin(θ), e β = λωcos(θ), where R s , L s Respectively, the motor stator phase winding resistance and inductance, u α , u β i α i β 、e α 、e β are the two-phase static voltage, current and back electromotive force under the α-β system respectively, λ is the back electromotive force coefficient, ω is the electrical angular velocity, and θ is the electrical angle;

[0036] The second step uses the Hall current sensor connected in series in the motor circuit to measure the three-phase winding current of the motor, which are respectively I a , I b and I c ;

[0037] Step 3 Based on the mathema...

Embodiment 3

[0040] In the method for quickly starting a permanent magnet synchronous motor at any speed described in Embodiment 1, the time amount t is replaced by the sampling period T during the discretization of the third step, that is, θ sim (k) = θ sim (k-1)+f elec *T, θ sim (k)∈[0,1); where k is the sampling moment.

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PUM

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Abstract

The invention provides an optional rotation speed quick starting method for a permanent magnet synchronous motor. The method comprises the following seven steps: (1) measuring a current rotating speed n<mech>r/min of a mechanical angular velocity of the motor by a hall sensor arranged at a rotor side of the permanent magnet synchronous motor; (2) determining an electric frequency as shown in the specification according to the rotating speed information n<mech> obtained in the sep (1); (3) inputting the electric frequency f<elec> obtained in the step (2) into a ramp function unit and generating an analogue angle quantity theta<sim>= f<elec>*t; (4) carrying out single-current closed-loop control on the analogue angle quantity theta<sim> in the step (3) and generating a three-phase sine wave current with the frequency f<elec>; (5) building an extended sliding mode observer on the basis of an alpha-beta mathematical model of the permanent magnet synchronous motor according to the three-phase sine wave current generated in the step (4); (6) making a difference between the analogue angle quantity theta<sim>obtained in the step (4) and an angular position estimator theta<est> obtained in the step (5) to obtain an angular position estimation error as shown in the specification; and (7) comparing the angular position estimation error as shown in the specification obtained in the step (6) with a given threshold theta. The optional rotation speed quick starting method is applied to optional rotation speed quick starting of the permanent magnet synchronous motor.

Description

Technical field: [0001] The invention relates to a method for quickly starting a permanent magnet synchronous motor at an arbitrary speed. Background technique: [0002] Permanent magnet synchronous motor has the advantages of simple structure, small size, high power factor, high power density, low moment of inertia, etc. It is widely used in small and medium capacity speed regulation, servo occasions and motion control fields, such as flywheel energy storage, electric vehicles, etc. Due to the different requirements of the electric and power generation modes, the permanent magnet synchronous motor can be in the speed-up and speed-down state frequently. In the electric mode, the motor continuously speeds up to the rated speed. The three-phase current can be quickly reversed, so as to ensure that the motor can be accelerated from the current speed, and how to realize the fast start of the motor at any speed becomes a key issue. [0003] The existing permanent magnet synchron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/34
Inventor 李树胜王志强刘海财郭巍
Owner BEIJING HONGHUI INT ENERGY TECH DEV CO LTD
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