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Motor control device

A motor control and current limiting technology, applied in motor generator control, control of electromechanical transmission, electronic commutation motor control, etc., can solve problems such as lack of proportional relationship

Active Publication Date: 2016-03-23
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when three-phase modulation or two-phase modulation is performed in generating PWM signals to be output to the inverter, current limitation cannot be performed using the device of Patent Document 1 because the duty value does not have a proportional relationship with the actual motor terminal voltage

Method used

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no. 1 example

[0029] will refer to Figure 2 to Figure 6 A motor control device according to a first embodiment will be described.

[0030] first, figure 2 The control block of the motor control device 101 is shown in . The motor control device 101 calculates a voltage command value to be supplied to the motor 80 under known vector control for performing coordinate transformation between a fixed coordinate system (three phases) and a rotating coordinate system (two phases). Hereinafter, in this specification, when describing the dq-axis voltage and dq-axis current of the rotating coordinate system, in principle, the q-axis current and q-axis voltage as the torque component will be described first, and then the d-axis as the excitation component will be described current and d-axis voltage. In the reference designation of the corresponding control box, in order to distinguish the q-axis current from the d-axis current, "1" is added to the end of the code of the control box of the q-axis ...

no. 2 example

[0100] will refer to Figure 7 control block diagram and Figure 8 A flowchart of the following is used to describe the motor control device according to the second embodiment. Configurations or steps that are substantially the same as those in the first embodiment or steps that are substantially the same are denoted by the same symbols or step symbols, and their descriptions will be omitted.

[0101] in accordance with Figure 7 In the motor control device 102 of the second embodiment shown in , only the figure 2 The difference between the motor control device 101 of the first embodiment shown in FIG.

[0102] In the motor control device 102 , the “current command value limiting unit” includes multipliers 331 and 332 . The motor control device 102 does not have the current protection value calculation units 471 and 472 of the first embodiment, and the q-axis current limit gain KIq_lim and the d-axis current limit gain KId_lim calculated by the current limit gain calculat...

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PUM

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Abstract

A motor control device for controlling a multiphase brushless motor (80) in a vector control manner includes: a current command value generation unit (311,312) that generates q-axis and d-axis current command values; a controller (361,362) that calculates q-axis and d-axis voltage command values; a saturation guard unit (37) that corrects the q-axis or d-axis voltage command value to set a magnitude of a voltage vector of the q-axis or d-axis voltage command value to be equal to or smaller than a predetermined voltage guard value; and a current command value limiting unit (321,322,331,332) that limits the q-axis or d-axis current command value using a current limit gain and a current guard value, which are calculated based on a voltage saturation amount as the magnitude of the voltage vector of the q-axis or d-axis voltage command value corrected by the saturation guard unit.

Description

technical field [0001] The present disclosure relates to a motor control device for controlling driving of a motor. Background technique [0002] Hitherto, in current feedback control of a brushless motor, techniques of correcting a current command limit value so as not to saturate a voltage and suppressing abnormal noise or vibration of a motor are known. [0003] For example, in the motor control device disclosed in Patent Document 1, voltage saturation is calculated from the PWM duty value, and a current command limit value to realize 100% duty is calculated based on the voltage saturation, thereby suppressing the current command value to prevent voltage saturation. [0004] In the device of Patent Document 1, assuming that there is a proportional relationship between the motor terminal voltage and the duty value of PWM, voltage saturation is obtained according to the duty value. However, when three-phase modulation or two-phase modulation is performed in generating PWM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/05
CPCH02P21/22H02P21/05
Inventor 大城洋佑小林大辅
Owner DENSO CORP