Comparison of Inverter Topologies for High-Speed
Two-level inverter configurations that can be used in three-phase motor drive systems include the three-phase bridge in-verter with wye or delta connected machines, and
For testing, a 110 W fan motor is used as the three-phase motor. Since it is difficult to find AC single-phase motor, a 30 W three-phase pump motor is modified into the single-phase motor, with the A and B phases connected and the C phase disconnected. The three-phase inverter is built with an IPM SIM6822M module rated at 600 V/5.0 A.
MOTOR DRIVE EXAMPLE Here, we present a motor drive design that highlights a significant advantage in using three single-phase inverters over a three-phase inverter. The system parameters of a 3.666 kW three-phase, high-speed motor drive operating at 2.046 kHz fundamental frequency, 3.01% rms phase current ripple, and /Vdc .
In, a dual-motor drive system for independent control of a three-phase motor and a single-phase motor is proposed, as shown in Fig. 2. It suggests three topologies of drive systems with a three-phase inverter: Types (1), (2), and (3). In Type (1), two motors are connected to the midpoint of two split DC-link capacitors, as shown in Fig. 2 a.
As the single-phase motor current is a zero-sequence component flowing in the three-phase motor, it does not affect the operation of the three-phase motor. The proposed drive system can reduce the number of power switches compared with the conventional drive system that uses a single-phase and a three-phase inverter.
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