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Method for identifying rotor resistance of asynchronous motor

A technology of asynchronous motor and rotor resistance, which is applied in the direction of motor control, control generator, motor generator test, etc. It can solve the problems of complex implementation and achieve the effect of low cost

Active Publication Date: 2020-02-04
EURA DRIVES ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method needs to configure the PWM module separately, and it is relatively complicated to implement

Method used

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  • Method for identifying rotor resistance of asynchronous motor
  • Method for identifying rotor resistance of asynchronous motor
  • Method for identifying rotor resistance of asynchronous motor

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Embodiment Construction

[0018] The technical scheme of the present invention is described in detail below:

[0019] In this embodiment, the implementation environment of the method for identifying the rotor resistance of an asynchronous motor is: a 4.0kW asynchronous servo drive and a 3.7kW asynchronous motor adapted to it. The asynchronous servo driver in this system uses 32-bit floating-point MCUMKV56F512VLQ24 / NXP as the main control chip, and the main frequency is 240Mhz.

[0020] The identification implementation method is:

[0021] Step 1. Simulate the stalling situation of the motor in the following way: Control the q-axis voltage U through the vector control model in the driver q and the magnetic flux vector angle θ are set to 0, and the AC voltage U is input on the d-axis d .

[0022] According to the vector control model analysis:

[0023]

[0024] In the above formula, U α , U β The coordinate system is U d , U q Convert to the voltage value in the stationary coordinate system. ...

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Abstract

The invention discloses a method for identifying rotor resistance of an asynchronous motor. Through the control of a vector control model in a driver, q-axis voltage and a magnetic flux vector angle are set to 0, and AC voltage is input on a d-axis, thereby achieving the purpose of locked-rotor simulation. The method can be implemented based on the existing vector control model in the driver, without adding a PWM device, which is simple, reliable and low in cost.

Description

technical field [0001] The invention relates to a method for identifying the rotor resistance of an asynchronous motor. Background technique [0002] The rotor time constant of asynchronous motor plays an important role in vector control, so the driver must obtain accurate rotor time constant before vector control of asynchronous motor. [0003] By formula: (Tr: rotor time constant, Lr: rotor inductance, Rr: rotor resistance) It can be seen that to obtain the rotor time constant, the two parameters of rotor inductance and rotor resistance must be identified. For asynchronous motors, these two parameters cannot To obtain it directly, it is necessary to obtain it in a disguised form through the no-load and locked-rotor tests of the asynchronous motor. It is easy to realize the no-load test of the drive for the motor, and it can be directly dragged through the V / F control, but it is relatively troublesome for the locked-rotor test. [0004] The current stall test method is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34H02P21/14H02P21/16
CPCG01R31/346H02P21/14H02P2207/01H02P21/16
Inventor 张国营陈永生
Owner EURA DRIVES ELECTRIC