Sensorless control method of permanent magnet synchronous motor in wide rotating speed scope

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc., and can solve the problems of large speed estimation error, easy switching failure, large speed fluctuation, etc.

Active Publication Date: 2015-09-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] However, when the speed is switched, the simple weighted average method of the speed is used, which has the disadvantages of large speed estimation error, large speed fluctuation during switching, and easy switching failure.

Method used

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  • Sensorless control method of permanent magnet synchronous motor in wide rotating speed scope
  • Sensorless control method of permanent magnet synchronous motor in wide rotating speed scope
  • Sensorless control method of permanent magnet synchronous motor in wide rotating speed scope

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Embodiment Construction

[0047] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings, taking the surface-mounted permanent magnet synchronous motor as an example.

[0048] The method for the positionless composite control of the surface-mounted permanent magnet synchronous motor with a wide speed range provided by the present invention is as follows: figure 1 As shown, first, build the figure 2 The coordinate system relationship diagram shown, d-q is the actual synchronous rotation coordinate system, In order to estimate the rotor synchronous rotating coordinate system, α-β is the actual two-phase stationary coordinate system, and define the estimated position error θ is the actual rotor position, To estimate the rotor position, it specifically includes the following steps:

[0049] Step 1. Detect any two-phase current in the three-phase windings A, B, and C of the motor, and first perform Clarke transformation to obtain the act...

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Abstract

The invention discloses a sensorless control method of a permanent magnet synchronous motor in a wide rotating speed scope and belongs to the field of permanent magnet synchronous motor technology. The method comprises steps of acquiring output current of the motor and establishing a slip form observer for estimating a stator current desired value; correcting weighting coefficient according to difference between the stator current desired value and the actual value and estimate value between the rotator angular velocity and rotor position; determining estimating value between the rotator angular velocity and rotor position according to the weighing coefficient, a low-speed position estimate value and a high-speed position estimate value; determining stator voltage reference value according to estimate value of the rotator angular velocity and the rotator position and the actual value of stator current; and obtaining three-phase inverter driving signal using space voltage vector modulation technology. The motor operates by the driving signal until the rotator angular velocity is converged to the estimate value. According to the invention, precision of rotating speed estimation, stability of the system and precision of a switching process are increased, fluctuation of rotating speed and shaking of the motor in the switching process of the rotating speed are reduced and the switching process is smoother.

Description

technical field [0001] The invention discloses a position sensorless control method for a permanent magnet synchronous motor within a wide speed range, and belongs to the technical field of permanent magnet synchronous motor control. Background technique [0002] In the permanent magnet synchronous motor control system, mechanical position sensors (such as photoelectric code discs and resolvers) are generally required to detect the rotor position and speed. However, the existence of the mechanical sensor increases the system cost and increases the system volume. At the same time, because the mechanical sensor has many connections, the complexity of the system is further increased, thereby reducing the reliability of the system and causing difficulties in installation. More prominently, mechanical sensors are easily affected by the working environment, which severely limits the use of permanent magnet synchronous motors in some special occasions with harsh environments. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/13H02P25/02
Inventor 王龙周波刘兵倪天恒
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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