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Electric motor control equipment and electric motor control method

A technology of control equipment and control method, which is applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc., can solve the problems of undisclosed resolver motor control, motor control has not been improved, etc. The effect of failure and prevention of control failure

Active Publication Date: 2004-08-04
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, Japanese Patent Laid-Open Publication No. 2001-165707 does not disclose motor control using the output of a resolver corrected using rotor speed
Therefore, motor control is not improved

Method used

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  • Electric motor control equipment and electric motor control method
  • Electric motor control equipment and electric motor control method
  • Electric motor control equipment and electric motor control method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0041] Such as figure 1 As shown, a motor control apparatus 100 according to the first embodiment of the present invention includes a direct current (DC) power supply B, inverters 10, 20, capacitor 30, resolvers 40, 50, current sensors 60, 70 and a control device 80.

[0042] Inverter 10 includes U-phase arm (bridge arm) 11 , V-phase arm 12 and W-phase arm 13 . U-phase arm 11, V-phase arm 12, and W-phase arm 13 are connected in parallel between nodes N1 and N2.

[0043] U-phase branch 11 includes NPN transistors Q3, Q4 connected in series. V-phase branch 12 includes NPN transistors Q5, Q6 connected in series. W-phase branch 13 includes NPN transistors Q7, Q8 connected in series. Each diode D3-D8 for flowing current from the emitter side to the collector side is connected at a portion between the collector and the emitter of each NPN transistor Q3-Q8.

[0044] The inverter 20 includes a U-phase branch 21 , a V-phase branch 22 and a W-phase branch 23 . U-phase branch 21 , V...

no. 2 example

[0096] Such as Figure 7 As shown, the configuration of the motor control apparatus 100A according to the second embodiment of the present invention is the same as that of the motor control apparatus 100 according to the first embodiment of the present invention, except that the control device 80 is replaced by a control device 80A.

[0097] Such as Figure 8 As shown, the control device 80A includes an angle correction unit 81A instead of the angle correction unit 81 of the control device 80 .

[0098] Angle correction unit 81A corrects rotation angles θbn1 , θbn2 output from resolvers 40 , 50 in consideration of variations in voltage phase commands for respective phases of AC motors M1 , M2 . That is, the angle correction unit 81A is based on the rotation angle θbn1 (or rotation angle θbn2) output from the resolver 40 (or the resolver 50 ) and the voltage phase command values ​​Vu1, Vv1, Vw1 (or voltage phase command values ​​Vu2, Vw1 ) output from the conversion unit 88 . ...

no. 3 example

[0117] Such as Figure 11 As shown, the motor control apparatus 100B according to the third embodiment of the present invention is the same as the motor control apparatus 100 according to the first embodiment of the present invention except that the control means 80 of the motor control apparatus 100 is replaced with a control means 80B.

[0118] Such as Figure 12 As shown, the control device 80B includes an angle correction unit 81B instead of the angle correction unit 81 of the control device 80 .

[0119] The angle correcting section 81B corrects the respective rotation angles at intervals of 60° in consideration of changes in the rotational speeds of each resolver 40 and resolver 50 . Such as Figure 13 As shown, when the rotation speed does not change, the rotation angle θbn (θbn1 or θbn2) increases linearly with time along a straight line K3. However, when the rotational speed changes, the rotational angle θbn increases nonlinearly with time as shown by the curve K4....

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Abstract

A control device measures time intervals T1 to T12 from the reference time until when each of the rotational angles thetabn1, thetabn2 output from each of resolvers becomes nx60 degrees (n=1 to 12, i.e., 60 degrees to 720 degrees). Then, the control device calculates a deviation angle Deltathetan at each of the rotational angles at the intervals of 60 degrees by calculating T1 / T12 to T11 / T12 using the measured T1 to T12. By substituting the calculated deviation angle Deltathetan into an equation, nx60 DEG +Deltathetan (n=1 to 11), the control device corrects the rotational angles at the intervals of 60 degrees. The control device generates each of drive signals DRV1, DRV2 using each of the corrected rotational angles, and outputs each of the drive signals DRV1, DRV2 to each of inverters. The inverters drive each of AC motors (M1, M2) based on each of the drive signals DRV1, DRV2.

Description

technical field [0001] The present invention relates to a motor control apparatus and control method for controlling a motor by correcting the output of a resolver (resolver) as a rotational position sensor. Background technique [0002] In order to continuously rotate the rotor of the motor using a rotating magnetic field, the rotational position of the rotor is detected. The rotational position of the rotor is detected by a resolver mounted on the shaft as a rotational position sensor. [0003] In other words, the resolver detects the rotational position of the rotating rotor, and outputs position signals corresponding to the respective rotational positions of the rotor as analog signals. The computer's central processing unit (hereinafter referred to as CPU) converts the analog signal output by the resolver into a digital signal. Based on the converted digital signal, the CPU generates a drive signal for supplying an alternating current for generating the rotating magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06H02P5/52H02P5/74H02P21/00H02P21/14H02P21/18H02P21/22H02P21/24H02P21/28H02P23/14H02P27/04H02P27/08
CPCH02P5/526H02P5/74H02P5/56H02P6/14
Inventor 矢口英明横山聪二郎
Owner DENSO CORP