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Method for permanent-magnet synchronous motor parameter on-line identification

A permanent magnet synchronous, motor technology, applied in motor generator control, electronic commutation motor control, control generator and other directions, can solve the problems of reduced motor operation efficiency, vector control deviation, affecting the dynamic characteristics of the control system, etc.

Inactive Publication Date: 2015-08-12
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] The error of the motor parameters not only affects the dynamic characteristics of the control system, but also causes the deviation of the vector control in the steady state, and the operating efficiency of the motor is reduced.

Method used

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  • Method for permanent-magnet synchronous motor parameter on-line identification
  • Method for permanent-magnet synchronous motor parameter on-line identification
  • Method for permanent-magnet synchronous motor parameter on-line identification

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Embodiment

[0081] Embodiment: the system constitution of embodiment and figure 1 Same, the system structure is as mentioned above, it adopts the variable frequency controller and eddy current brake load independently developed by the applicant. The tested motor is not an ideal hidden pole PMSM, and the specifications of the tested motor are shown in Table 1:

[0082] Table 1 Parameters of the tested motor

[0083]

[0084] Use the LCR bridge and offline parameter identification method (DC voltammetry to measure R s , DC decay method to measure L d and L q , measured by the idling terminal voltage method ) Detect the motor parameters and confirm their changing characteristics.

[0085] Figure 5 (a) is the measured temperature characteristic. As the motor temperature T increases, R s , L d and L q increase, while slightly reduced. When the temperature rises from 25°C to 100°C, R s , L d and L q increased by 7.5%, 7.5% and 15%, respectively, 8.1% reduction.

[0086] ...

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Abstract

The invention relates to a method for permanent-magnet synchronous motor (PMSM) parameter on-line identification. The method is based on a speed sensorless vector control system of a virtual dc-qc coordinate system. The method comprises: 1) for a non-salient PMSM, establishing a qc-axis steady-state equation considering motor parameter error influence, the equation being u<qc> is approximately equal to R<s>i<qc>+ [omega]L<d>i<dc>+[omega][phi], wherein R<s> is the resistor of a stator winding, L<d> is an direct axis inductor, the [phi] is a magnetic linkage, [omega] is rotor angular velocity, u<qc> is qc-axis voltage, i<qc> is qc-axis current, i<dc> is dc-axis current; 2) and properly adjusting motor operating states repeatedly, and recording the steady-state value of each variable in the steady-state value, substituting into the equation to obtain a plurality of groups of steady-state relations, and obtaining the identification values of motor parameters through calculation of state variable increment. The method just duly adds short-time small disturbance of i<dc> and [omega] instructions in an original control strategy, having not influence on original control flow and system normal operation. The method is simple and fast in algorithm, and can realize non-salient or salient-pole PMSM parameter on-line identification in low cost.

Description

technical field [0001] The invention belongs to the technical field of electric transmission and power electronics, and in particular relates to a method for online identification of parameters of a permanent magnet synchronous motor. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM: Permanent Magnet Synchronous Motor) has the advantages of high specific power, energy saving and high efficiency, and precise control, and has been widely used in various fields []] . The high-performance control methods of PMSM mainly include vector control and direct torque control. Among them, the speed sensorless control system with low system cost and strong environmental adaptability has become a research hotspot. [0003] The performance of the PMSM speed sensorless control system largely depends on the estimation accuracy of the rotor position and speed, and the detection methods can be divided into two categories. The first type is to estimate the position and s...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 徐政黄河清陈锐坚
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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