Control equipment for rotating machinery
A technology for rotating machinery and control equipment, which is applied in motor control, motor generator control, AC motor control, etc. It can solve the problems of increased switching times and switching losses, so as to reduce switching losses, reduce switching times, and improve power efficiency Effect
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no. 1 example
[0054] will refer to Figure 3 to Figure 9B The motor control device 10 in the first embodiment will be described.
[0055] image 3 The control block diagram of the controller 65 is shown by enclosing it with a two-dot chain line in the motor control device 10 . Therefore, the inverters 601, 602, the current sensors 701, 702, and the fault detection sections 751, 752 are not included in the controller in the present disclosure. It should be noted that this explanation is limited to conceptual distinctions. It should be noted that electronic components are not individually arranged in an actual substrate.
[0056] When all inverters and all winding sets in all systems are operating normally without any fault, the inverters and winding sets in both the first system and the second system are operating normally, and such The situation is referred to as a normal driving state.
[0057] Representing all the systems, the structure of the first system in the normal driving state...
no. 2 example
[0109] will refer to Figure 10 to Figure 12 A second embodiment will be described.
[0110] The motor control apparatus 10 in the second embodiment operates the switching elements 611 to 616, 621 to 626 of the inverters 601, 602 by three-phase modulation processing in PWM control in a normal driving state, and controls the three-phase AC motor 80 .
[0111] Figure 10 It is described that the controller 65 has the two-phase modulation processing section 382 between the duty calculation section 362 and the carrier comparison section 402 . exist Figure 10 In , the second system is described as an example. The two-phase modulation processing section 382 executes flat-top two-phase modulation processing or flat-top two-phase modulation processing. The two-phase modulation processing section 382 adds two-phase modulation processing to the duty ratio command signals Du, Dv, Dw in each phase calculated by the duty ratio calculation section 362 , and outputs to the carrier comp...
no. 3 example
[0130] will refer to Figure 13 A third embodiment will be described.
[0131] When a failure of the inverter 601 or the winding group 801 in the first system is detected and the motor 80 is driven only by the second system, the motor control apparatus 10 in the third embodiment realizes the The switching operation of the inverter 602 is operated.
[0132] JP 2011-35991A1 and JP 2013-162660A1 disclose pulse wave control. The pulse wave control operates the switching of the switching element based on the pulse waveform of the output voltage, which is synchronized with the electrical angle of the motor 80 . Specifically, according to the modulation rate, the voltage phase, and the number of times of switching in a predetermined period, an appropriate pulse waveform is selected with reference to a map or the like.
[0133] Figure 13 An example of a pulse waveform in which a fifth harmonic component is deleted is shown. The number of switching times in 1 / 2 electrical cycle w...
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