A method of testing the initial position angle of motor rotor
A technology of motor rotor and initial position, which is applied in the direction of electronic commutator, electrical components, control system, etc., can solve the problems of the influence of motor load size measurement accuracy, high test condition requirements, wrong values, etc., and achieve online fault diagnosis and The effect of error correction control, low test condition requirements and high accuracy
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Embodiment 1
[0045] Such as figure 1 As shown, in Embodiment 1 of the present invention, a method for testing the initial position angle of the motor rotor includes the following steps:
[0046] Step 1, first give the motor to be tested a current i to make the motor run; the frequency of the current i is relatively low, and it can be tested as long as the motor rotates. The current frequency determines the speed at which the motor rotates, so the frequency of the current i can be within the rated speed range If the frequency of the current i is 1 / 3 of the rated frequency of the motor.
[0047] Step 2, after the motor is running, the current i is zero, that is, i d = 0 and iq = 0;
[0048] Step 3, read the voltage u of the d-axis and q-axis of the motor stator in the converter at this time d , u q ;
[0049] Step 4, according to u d , u q The trigonometric function relationship between calculates the initial position angle deviation θ of the motor rotor at this time err .
[0050] ...
Embodiment 2
[0080] In Embodiment 2 of the present invention, the initial position angle deviation θ of the motor rotor err The trigonometric function relationship of is expressed as follows:
[0081] When the motor rotates forward, the θ err =arccot2(u q ,u d ).
[0082] When the motor rotates in reverse, the θ err =arccot2(-u q ,-u d ).
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