Motor control device and air conditioner
A technology of control devices and motors, applied in AC motor control, air conditioning systems, control systems, 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 a compressor motor of an 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 motor 4 are housed in the same iron airtight container 5 . The rotor shaft of the electric motor 4 is connected to the compression unit 3 . Furthermore, the compressor 2 , the four-way valve 6 , the indoor heat exchanger 7 , the decompression device 8 , and the outdoor heat exchanger 9 are connected by pipes serving as heat transfer medium channels to form a closed loop. In addition, the compressor 2 is, for example, a rotary compressor. The motor 4 is, for example, a three-phase IPM (Interior Permanent Magnet: interior permanent magnet) motor (brushless DC motor). The air conditioner E is configured to include the heat pump system 1 described above.
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no. 2 Embodiment approach
[0150] Figure 19 to Figure 33 This is the second embodiment, and the same reference numerals are attached to the same parts as those in the first embodiment to omit description, and the different parts will be described below. For example, in pattern (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 approaches the minimum and the W-phase pulse approaches 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-phase and W-phase pulse widths, and the U-phase pulse width is set to "0" to perform two-phase modulation. Then, by changing the second detection timing to a variable timing obtained by subtracting the minimum width from W0_bai, the V-phase and U-phase (negative) currents are de...
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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