Motor Controls and Air Conditioners
A technology for control devices and motors, which is applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc. It can solve the obstacles to the realization of high-efficiency operation, the increase of switching loss of switching elements, and the lack of consideration of the AC output voltage ratio. Modulation rate and other issues, to achieve the effect of efficient operation
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no. 1 approach
[0043] (Overall structure of the motor control device according to the first embodiment of the present invention)
[0044] First, refer to figure 1 The overall configuration of the motor control device according to the first embodiment of the present invention will be described. figure 1 It is a block diagram showing the overall configuration of a motor control device 11A according to the first embodiment of the present invention.
[0045] In the motor control device 11A of the first embodiment, a three-phase synchronous motor 15 (corresponding to the "three-phase motor" of the present invention is used. Specifically, for example, a DC brushless motor is used.) using a three-phase inverter circuit 17A. The case of drive control is explained as an example.
[0046] The motor control device 11A according to the first embodiment switches between the three phases according to the junction temperature Tj of the first to sixth switching elements SIup, SMun, SIvp, SMvn, SIwp, and S...
no. 2 approach
[0117] (Switching control of modulation method based on modulation rate)
[0118] In the first embodiment, the junction temperature Tj and the circuit current Io of the switching elements in the three-phase inverter circuit 17A were used as technical elements for switching the modulation method, but in the second embodiment, the modulation factor This point is different from the first embodiment.
[0119] The switching losses of the first to sixth switching elements SIup to SMwn of the three-phase inverter circuit 17A vary not only with the modulation method but also with the modulation rate. Specifically, when the PWM-controlled switching operation is performed when the circuit current Io of the three-phase inverter circuit 17A is large, the switching losses of the first to sixth switching elements SIup to SMwn increase. Also, when the PWM-controlled switching operation is performed when the circuit current Io is small, the switching losses of the first to sixth switching el...
no. 3 approach
[0161] Such as figure 1 or Figure 12 As shown, in the first and second embodiments, the three-phase inverter circuit 17A is driven by the DC power supply 13 , but the DC power supply 13 may be replaced by an inverter circuit capable of controlling the DC output voltage.
[0162] Figure 18 It is a block diagram showing the configuration of a DC power supply for a three-phase inverter circuit according to a third embodiment of the present invention, that is, a converter circuit 100A that includes a reactor on the AC side and controls a DC output voltage.
[0163] Such as Figure 18 As shown, the main circuit of the conversion circuit 100A includes a reactor 103 connected in series with the commercial power supply 101, a diode bridge 105 for rectifying the AC voltage of the commercial power supply 101 into a DC voltage, and the DC voltage rectified by the diode bridge 105. A smoothing capacitor 107 for smoothing the ripple component, and a bidirectional switch 109 for connec...
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