Inverter device integrated electric compressor
An inverter device and inverter technology, which is applied in transportation and packaging, electric vehicles, motors, etc., can solve the problems of small and lightweight development of air conditioners for vehicles, small torque and other problems, and achieve small, lightweight and vibration-resistant Reliability, high reliability, effect of ensuring reliability
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Embodiment approach 1
[0074] Fig. 1 shows a circuit diagram of this embodiment. In the figure, 1 is a battery, 2 is a switching element for inverter operation connected to the battery 1, and 3 is a diode for inverter operation. In addition, 4 represents the stator coil of the motor, and 5 represents the magnetic rotor of the motor. In addition, reference numeral 7 denotes a control circuit that controls the switching element based on a signal from the current sensor 6 as a current detection mechanism. 37 is an inverter circuit, 20 is an inverter device, and 31 is a motor.
[0075] Here, if the circuit diagram of FIG. 1 is compared with the circuit diagram for 120-degree energization driving in FIG. 22, the diagram shown in the first embodiment does not require the comparison circuit 128 and the phase conversion circuit 127.
[0076] In addition, if the circuit diagram of FIG. 1 is compared with the circuit diagram for sine wave driving equipped with a current sensor for phase current detection in FIG. ...
Embodiment approach 2
[0108] Next, the second embodiment will be described with reference to FIGS. 14 and 15. The second embodiment is a processing method for improving the accuracy of the detected position described in the first embodiment using FIG. 12.
[0109] Fig. 14 shows that in Fig. 12, the energization at a phase of 30 degrees is shifted from the U phase indicated by the thin solid line to the left and the W phase indicated by the thick solid line to the right. As a result, not only the V-phase, but the U-phase current and the W-phase current can also be measured.
[0110] Fig. 15 shows the energization when the phase is 30 degrees in Fig. 13, and the U phase is shifted to the left and the W phase to the right. Thus, both the U-phase current and the W-phase current can be measured. In addition, the energization at the 90-degree phase shifts the V phase to the left and the W phase to the right.
[0111] As a result, both the V-phase current and the W-phase current can be measured. In the phases...
Embodiment approach 3
[0115] Next, the third embodiment will be described with reference to FIG. 16. The present embodiment shown in FIG. 16 is another countermeasure to improve the accuracy of the measured position described in the above-mentioned first embodiment using FIG. 12.
[0116] First, the utility of 3-phase modulation will be explained. In order to reduce vibration, it is preferable to use 3-phase modulation. Because of the three-phase modulation, the modulation range of the phase range is smaller than that of the two-phase modulation, the sine wave current is smooth and the vibration is small.
[0117] In FIG. 8, when the three-phase modulation is used, the on-period can be added to the V-phase. Therefore, when the three phases of U, V, and W in the center part of the carrier cycle are all on, the current does not flow to the current sensor 6, so when it is the same as 3, it is off (the power from which side is not supplied to the motor). power). Therefore, the power (modulation) is supplie...
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