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Control equipment for AC motors

A technology for controlling equipment and AC motors, applied in the direction of AC motor control, motor control, motor generator control, etc., which can solve problems such as inability to properly detect abnormalities of current sensors

Active Publication Date: 2017-03-01
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Patent Document 2 does not mention these points, so according to the technology of Patent Document 2, it is highly likely that the abnormality of the current sensor cannot be properly detected

Method used

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  • Control equipment for AC motors
  • Control equipment for AC motors
  • Control equipment for AC motors

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Experimental program
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no. 1 approach

[0041] Such as 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.

[0042] The motor drive system 1 includes an AC motor 2, a DC power supply 8, a motor control device 10, and the like.

[0043] The AC motor 2 is, for example, an electric motor for generating torque for driving drive wheels 6 of the electric vehicle. The AC motor 2 of this embodiment is a three-phase permanent magnet synchronous motor.

[0044] Electric vehicles are assumed to include vehicles for driving drive wheels 6 by electric energy, such as hybrid cars, electric cars, and vehicles powered by fuel cells. The electric vehicle of the present embodiment is a hybrid vehicle provided with an engine 3, and the AC motor 2 is a so-called motor generator having a function as an electric motor generating torque for driving the drive wheels 6 and as a Th...

no. 2 approach

[0142] will be based on Figure 9 and Figure 10 A description will be given of a control device for an AC motor according to a second embodiment of the present disclosure.

[0143] The second embodiment of the present disclosure differs from the first embodiment in that: at the time of two-phase control, current estimation processing in the current estimation section 32 is not performed; and at the time of one-phase control, two-phase control current calculation is not performed. Calculation of the d-axis current value id and the q-axis current value iq in the unit 31 . Therefore, this point will be mainly described, and descriptions of other configurations will be omitted.

[0144] like Figure 9 As shown in , when the abnormality determination is made by the abnormality determination part 45, that is, a monitoring request is made, the two-phase control current calculation part 31 stops calculating the d-axis current value id and the q-axis current value iq. On the other...

no. 3 approach

[0160] The third embodiment is a modified example of the second embodiment. will be based on Figure 11 and Figure 12 The current feedback processing according to the third embodiment is described.

[0161] As described in the first embodiment, the current estimating section 32 performs the calculation of the filter system so that the d-axis current estimated value id_est and the q-axis current estimated value iq_est are not always consistent with the actual d-axis current value id and The actual q-axis current value iq is the same. For this reason, in the present embodiment, calculation of the d-axis current estimated value id_est and the q-axis current estimated value iq_est is started at a given timing before the timing at which the two-phase control is switched to the one-phase control.

[0162] This embodiment and Figure 11 The difference of the second embodiment of the whole current feedback process shown in , is that S215 and S216 are added between S205 and S206, ...

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PUM

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Abstract

Provided is a control device for a three-phase AC motor, the control device comprising: control phase current acquisition device; monitoring phase current acquisition device; rotation angle acquisition device; two-phase control current value current calculation device; one-phase current estimation value estimating means; voltage command value calculating means; other phase current estimating means for calculating a monitor phase current estimated value or a control phase current estimated value; an abnormality detecting means for detecting an abnormality in a monitor phase current sensor or a control phase current sensor; and switching means for switching between a monitoring stop mode in which the voltage command value is calculated based on the two-phase control current values ​​and a monitoring mode in which the voltage command value is calculated based on the one-phase current estimated value, and The abnormality detecting means detects abnormality at predetermined time intervals.

Description

technical field [0001] The present disclosure relates to a control device for an AC motor. Background technique [0002] In recent years, electric vehicles and hybrid vehicles, each of which is equipped with an AC (alternating current) motor as a power source of the vehicle, are attracting attention due to social demands for lower fuel consumption and less exhaust emissions. For example, in some hybrid cars, a DC (direct current) power source made of a secondary battery or the like and an AC motor are connected to each other via a power conversion device constructed of an inverter or the like, and the DC voltage of the DC power source is converted by the inverter into an AC voltage to drive an AC motor. [0003] In addition, in the case where an AC motor is installed in an electric vehicle or the like, it is desirable that an abnormality generated in a current sensor or the like can be detected from the viewpoint of fail-safe. For example, in Patent Document 1, in a case w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P29/024H02P21/14H02P21/22H02P23/00H02P21/00H02P23/06H02P27/08H02P29/00
CPCH02P29/027H02P21/14H02P21/22
Inventor 铃木崇史加古宽文伊藤武志
Owner DENSO CORP