Motor controls and air conditioners
A control device, motor technology, applied in the direction of AC motor control, air conditioning system, control system, etc.
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no. 1 Embodiment approach
[0051] Hereinafter, as an example of a heat pump system, refer to Figure 1 to Figure 18 A first embodiment for driving the compressor motor of the air conditioner will be described. exist figure 2 Among them, the compressor (load) 2 constituting the heat pump system 1 is configured such that the compression unit 3 and the electric motor 4 are housed in the same iron-made airtight container 5 . The rotor shaft of the electric motor 4 is connected to the compression unit 3 . In addition, the compressor 2, the four-way valve 6, the indoor side heat exchanger 7, the decompression device 8, and the outdoor side heat exchanger 9 are connected by a pipe serving as a heat transfer medium flow path to form a closed loop. In addition, the compressor 2 is, for example, a rotary compressor. The motor 4 is, for example, a 3-phase IPM (Interior Permanent Magnet: built-in permanent magnet) motor (brushless DC motor). The air conditioner E is configured to have the above-described heat ...
no. 2 Embodiment approach
[0150] Figure 19 to Figure 33 This is the second embodiment, and the same parts as those in the first embodiment are denoted by the same reference numerals and descriptions thereof are omitted, and the different parts will be described below. For example, in mode (1), the V-phase current is detected at the first detection timing, and the U-phase (negative) current is detected at the second detection timing. However, if Figure 19 As shown in (a), when the U-phase pulse is close to the minimum and the W-phase pulse is close to the maximum, the U-phase (negative) current is also detected at the first detection timing. Therefore, in the second embodiment, in this case, the U-phase pulse width is subtracted from the V and W-phase pulse widths, and the U-phase pulse width is set to "0" to perform two-phase modulation. Then, the second detection timing is changed to a variable timing obtained by subtracting the minimum width from W0_bai, and the V-phase and U-phase (negative) cur...
no. 3 Embodiment approach
[0202] Figure 33 to Figure 43 It is the third embodiment. In the third embodiment, the case where the duty ratio of only one of the three phases shows a value close to the maximum value (maximum phase) while the duty ratios of the other two phases show It is a very large case where the duty cycle difference is large because it is close to the minimum value (very small phase). E.g Figure 33 In the case of pattern (1) shown in (a) (the V phase is large, and the U and W phases are small), the V phase is detected at both the first and second detection timings.
[0203] Therefore, in this case, the value obtained by subtracting the duty ratio of the V phase from 100% is added to the duty ratio of each phase (the V phase is 100%). In addition, the direction of increase and decrease of the duty ratio of the U phase is changed from the bottom of the triangular wave to the opposite direction of the duty ratio of the W phase. And, by changing the second detection timing from "vari...
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