Motor drive unit and air conditioner
A driving device and motor technology, applied in the direction of AC motor control, electrical components, output power conversion devices, etc., can solve the problem of current capacity decline, etc., and achieve the effect of suppressing the increase of loss and eliminating inconsistency
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Embodiment approach 1
[0022] figure 1 It is a diagram showing a configuration example of the motor drive device 100 according to Embodiment 1 of the present invention. Such as figure 1 As shown, the motor driving device 100 for driving the motor 8 as an electric motor includes: a rectifier 2 for rectifying the AC current input from the AC power supply 1 into a DC current; a reactor 3; a capacitor 4; Terminal voltage; Inverter modules 5, 6, 7 convert DC current into 3-phase AC current to drive motor 8 as a 3-phase motor; Control unit 9 generates drive signals for controlling inverter modules 5-7 That is, the PWM signal; and the drive control units 30 , 31 , and 32 . Between the inverter modules 5 , 7 and the motor 8 , current measurement units 10 a , 10 b for measuring the motor current are provided. The inverter unit 101 is constituted by the inverter modules 5 , 6 , and 7 .
[0023] The motor drive device 100 can be used in air conditioners, refrigerators, washing and drying machines, refriger...
Embodiment approach 2
[0054] In Embodiment 1, an example is described in which gate resistors having different values are used depending on differences in inductance of signal lines for PWM signals or differences in threshold voltages of switching elements. In Embodiment 2, an example in which the gate resistor has a variable resistance value function will be described.
[0055] The description of the parts common to Embodiment 1 will be omitted, and the differences will be described. Figure 5 It is a diagram showing an example of an internal circuit diagram of a drive control circuit 39a for controlling the on and off of the switching element 5a according to the second embodiment. compared to figure 2 In the drive control circuit 39a of Embodiment 1 shown, the gate resistor Rg1 is deleted, and the gate resistor Rg2 having a variable resistance function is added. The gate resistor Rg2 is a variable resistor whose resistance value can be changed. Thereby, even when the switching timing of the...
Embodiment approach 3
[0062] In Embodiment 3, the air conditioner provided with the motor drive device 100 demonstrated in Embodiment 1 or 2 is demonstrated.
[0063] Figure 7 It is a figure which shows the structural example of the air conditioner 80 which concerns on Embodiment 3. The air conditioner 80 can be provided with the motor drive device 100 demonstrated in Embodiment 1 or 2. As shown in FIG. The air conditioner 80 has a refrigeration circuit in which a compressor 81 with a built-in motor 8 , a four-way valve 82 , an outdoor heat exchanger 83 , an expansion valve 84 , and an indoor heat exchanger 85 are installed via a refrigerant pipe 86 to form a split air conditioner. Regulator.
[0064] Inside the compressor 81, a compression mechanism 87 for compressing refrigerant and a motor 8 for operating the compression mechanism 87 are provided. In the air conditioner 80 , the refrigerant circulates from the compressor 81 between the outdoor heat exchanger 83 and the indoor heat exchanger ...
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