Realization of a Three-Switch Leg/Phase Inverter for Nine-Phase Variable Pole– Phase Induction Machine With Phase Grouping Concepts
- Resource Type
- Periodical
- Authors
- Reddy, B.P.; Sundar, N.S.
- Source
- IEEE Transactions on Industrial Electronics IEEE Trans. Ind. Electron. Industrial Electronics, IEEE Transactions on. 71(2):1181-1190 Feb, 2024
- Subject
- Power, Energy and Industry Applications
Signal Processing and Analysis
Communication, Networking and Broadcast Technologies
Inverters
Windings
Voltage
Topology
Legged locomotion
Induction motors
Coils
Induction motor (IM)
phase grouping concepts
split winding concept
three-switch leg (3SL)
variable pole–phase machine
- Language
- ISSN
- 0278-0046
1557-9948
In this article, a three-switch leg (3SL)/phase inverter topology is realized for nine-phase variable pole–phase induction motor (9Ph-VPIM) drives. The 3SL in the proposed inverter are controlled with two nonintersecting phase-shifted references to achieve a three-level voltage excitation for each phase winding. These two nonintersecting references per leg limit the possible modulation index (MI) and may require a higher dc-link voltage. The split winding concept and the phase grouping solutions are used to enhance the MI. In the split winding concept, phase winding of the 2 n pole machine is divided into n number of distinct windings and excited with the same voltage for attaining a uniform air gap flux. These coils are called cognate voltage coils (CVC). With these CVCs, different possible groupings are proposed to enhance the MI of a proposed 3SL/phase inverter. The symmetrical and efficient phase grouping solutions are analyzed and tested with an improved MI. Moreover, the proposed 9Ph-VPIM drive is controlled with carrier-based 3- φ space vector pulsewidth modulation to further enhance the dc-link voltage utilization. The proposed inverter will feed the effective phase by a three-level voltage with suppressed harmonics resulting in a superior torque ripple. The proposed 3SL/phase inverter fed 5-hp 9Ph-VPIM drive is validated with the experimental prototype.