drive system for electric motors
A drive system and motor technology, applied in the direction of AC motor control, control system, DC motor speed/torque control, etc., can solve problems such as the superposition of surge voltage that is not described
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no. 1 example
[0022] A driving system for a motor according to the present disclosure will be described below with reference to the accompanying drawings. In various embodiments, substantially the same components are denoted by the same reference numerals, and descriptions thereof will be omitted. Such as figure 1 As shown, the drive system 1 for a motor according to the first embodiment is installed in an unshown vehicle. The vehicle is an electrically driven vehicle such as an electric vehicle or a hybrid vehicle. A motor 80 as a rotating electrical machine, such as a permanent magnet synchronous three-phase AC motor, has a U-phase coil 81 , a V-phase coil 82 and a W-phase coil 83 . In the present embodiment, the coils 81 to 83 correspond to windings. The motor 80 is a so-called traction unit motor that generates torque for driving unshown drive wheels, and is a motor generator that has a function as a motor for driving the drive wheels and a function as a generator that The generator...
no. 2 example
[0066] The second example is Figure 9 with Figure 10 shown. The difference between the second embodiment and the third embodiment and the above-mentioned embodiments lies in the processing of reducing the surge voltage, so the second embodiment and the third embodiment will be described with emphasis on this point. In this embodiment, the modulation coefficient M1 of the first modulated wave is different from the modulation coefficient M2 of the second modulated wave due to the surge reduction process. Similar processing may be performed by the inverter control calculation sections 31 and 32, or one of the inverter control calculation sections may calculate the modulation coefficients M1 and M2, and may instruct the other of the inverter control calculation sections. The control signals for the inverters 60 and 70 can be generated by a microcomputer. The same applies to the third embodiment.
[0067] In dual-sided drive mode, the output is determined by the superposition...
no. 3 example
[0077] The third embodiment is shown in Figure 11 to Figure 13 .
[0078] The drive control processing in this embodiment is similar to Figure 8 The drive control processing in S107 and the surge reduction processing in S107 are different from those in the first embodiment. In this embodiment, the frequency of one of the carriers Carr1 and Carr2 is made lower than the other of the carriers Carr1 and Carr2 by surge reduction processing. In this embodiment, the frequency of the second carrier Carr2 is described as decreasing. Changing the frequency so that the half period of the second carrier Carr2 is longer than the period T2 (see image 3 ). As a result, the number of occurrences of continuous switching becomes at most one in the continuous switching interval Rs, so that the frequency of occurrence of continuous switching can be reduced. Below, refer to Figure 11 with Figure 12 to describe the frequency of successive handoffs. exist Figure 11 with 12 , the firs...
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