Control device of Ac motor
A control device, three-phase AC technology, applied in the direction of AC motor control, motor generator control, control of electromechanical transmission devices, etc., can solve the problem that the output torque cannot be directly monitored, the q-axis current cannot be operated, and the torque conversion, etc.
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no. 1 example ）
[0030] like figure 1 As shown, a motor control device 10 as a control device of an AC motor 2 according to the first embodiment of the present disclosure is applied to a motor drive system 1 for driving an electric vehicle.
[0031] The motor drive system 1 includes an AC motor 2, a DC power supply 8, a motor control device 10, and the like.
[0032] The AC motor 2 is, for example, an electric motor for generating torque that drives drive wheels 6 of the electric vehicle. The AC motor 2 of this embodiment is a permanent magnet synchronous type three-phase AC motor.
[0033] It is assumed that electric vehicles include vehicles for driving drive wheels 6 by electric energy (such as hybrid vehicles, electric vehicles, and vehicles powered by fuel cells). The electric vehicle of the present embodiment is a hybrid vehicle provided with an engine 3, and the alternator 2 is a so-called motor generator (marked by "MG" in the drawings) which torque, and has a function as a generato...
no. 2 example ）
[0130] The embodiments from the second embodiment to the fifth embodiment are different from the above-described embodiments in the torque abnormality monitoring section, and thus this difference will be mainly described.
[0131] will be Figure 10 The control section 15 according to the second embodiment of the present disclosure is shown in FIG. The torque abnormality monitoring unit 42 of the present embodiment calculates the width Ia of the W-phase current sensed value iw_sns. It is assumed that the second normal determination range is not smaller than the threshold E11 and not larger than the threshold E12. If the amplitude Ia is not smaller than the threshold value E11 and not larger than the threshold value E12, it is determined that the output torque is normal. Further, if the amplitude Ia is smaller than the threshold value E11 or larger than the threshold value E12, it is determined that an abnormality is caused in the output torque. In the present embodiment, if...
no. 3 example ）
[0150] will be Figure 11 A control section 15 according to a third embodiment of the present disclosure is shown in FIG.
[0151] In addition to the components in the above-described embodiments, the control unit 15 of the present embodiment further includes a three-phase current command value calculation unit 35 .
[0152] The three-phase current command value calculation unit 35 inversely dq converts the d-axis current command value id* and the q-axis current command value iq* into the W-phase current command value iw* based on the electrical angle θe. The three-phase current command value calculation unit 35 outputs the W-phase current command value iw* to the torque abnormality monitoring unit 43 .
[0153] The torque abnormality monitoring unit 43 monitors the abnormality in the output torque based on the absolute value of the W-phase error iw_err which is the difference between the W-phase current command value iw* and the W-phase current sensed value iw_sns, the W-pha...
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