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Control system for multiphase electric rotating machine

A technology for rotating electrical machines and control systems, applied in the field of control systems, can solve problems such as circuit complexity

Active Publication Date: 2013-03-20
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the circuit is complicated

Method used

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  • Control system for multiphase electric rotating machine
  • Control system for multiphase electric rotating machine
  • Control system for multiphase electric rotating machine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0049] first reference figure 1 , the brushless motor 2 is a three-phase motor with a permanent magnet as a rotor, and is used as an actuator for a fuel pump of an onboard internal combustion engine. Three phases (U phase, V phase, W phase) of the brushless motor 2 are connected to a power conversion circuit 3 such as an inverter which is a power converter from direct current to alternating current. The power conversion circuit 3 is a three-phase power conversion circuit, and appropriately applies the voltage on the battery 12 side to the three phases of the brushless motor 2 . Specifically, the power conversion circuit 3 has a parallel connection circuit including switching elements SW1, SW2, switching elements SW3, SW4, and switching elements SW5, SW6 so that each of the three phases is connected to the positive electrode side or the negative electrode side of the battery 12. The electrode side is turned on. A connection point connecting the switching element SW1 and the s...

no. 2 example

[0085] exist Figure 8 In the second embodiment shown in , the power conversion circuit 3 is constructed in the same manner as in the first embodiment, and the control unit 20 controls the brushless DC motor 2 by operating the power conversion circuit 3 . In this example, switching control is basically performed by a 120° energization method. Specifically, the timing at which the induced voltage becomes the neutral point voltage (reference voltage Vr) of the brushless motor 2 is detected using the timing at which the induced voltage appears in the terminal voltages Vu, Vv, and Vw of the corresponding phases of the brushless motor 2 (zero crossing moment). Assume that the reference voltage Vr is provided by dividing the terminal voltages Vu, Vv, and Vw of the corresponding phases of the brushless motor 2 through the resistance elements RU, RV, and RW. Assuming that the zero-crossing timing is the inversion timing of the outputs of the comparators 21, 22 and 23, the comparator...

no. 3 example

[0108] In the third embodiment, for example, as Figure 13 As shown, the starting process of the brushless motor 2 is repeatedly executed by the control unit 20 at a given cycle.

[0109] In this series of processing, first, the first positioning process is performed in S30. The first positioning process controls the target angle to the first positioning target angle by allowing current to flow from one specific phase of the brushless motor 2 to the remaining two phases. According to the energization method described above, since the force for reducing the phase shift of the rotation angle of the brushless motor 2 from the first positioning target angle is applied, the convergence time of the first positioning target angle can be reduced. Therefore, the time for performing the first positioning process (first required time T1) is adjusted based on the time at which the magnitude of rotation angle variation is shorter than the angular interval between the first positioning tar...

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Abstract

A control system controls a multiphase rotating machine by a 120 DEG energization process and a PWM process. In the 120 DEG energization process, respective ones of switching elements of a high side arm and switching elements of a low side arm of a power conversion circuit are turned on. In the PWM process, the switching elements of the power conversion circuit turn on / off so that two phases that are connected to the switching elements that are in the on-state are alternately rendered conductive to the high potential side input terminal and the low potential side input terminal of the power conversion circuit.

Description

technical field [0001] The present invention relates to a control system for a multiphase rotating electrical machine, which applies voltage to the multiphase rotating electrical machine by operating switching elements of a power conversion circuit. Background technique [0002] In a conventional control system for polyphase motors, such as in JP-9-312993A, when a rectangular waveform voltage is applied to a three-phase motor by a 120° energization method (system), the pulse width of the rectangular waveform voltage is modulated. In this system, pulse width modulation (PWM) is performed in synchronization with the switching timing for switching of the applied rectangular waveform voltage. This suppresses noise at the time of switching the switching element performing pulse width modulation. [0003] When PWM processing is performed in the above-described manner, the neutral point potential of the brushless motor changes in synchronization with pulse width modulation. On th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/18H02P6/06H02P6/08H02P6/182
Inventor 黑田昌宽泷浩志植田展正赤间贞洋长田喜芳大竹晶也
Owner DENSO CORP
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