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Multi-criteria-based design approach of multi-phase permanent magnet low-speed synchronous machines

Multi-criteria-based design approach of multi-phase permanent magnet low-speed synchronous machines

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© The Institution of Engineering and Technology
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A design methodology dedicated to multi-phase permanent magnet synchronous machines (PMSMs) supplied by pulse width modulation voltage source inverters (PWM VSIs) is presented. First, opportunities for increasing torque density using the harmonics are considered. The specific constraints caused by the PWM supply of multi-phase machines are also taken into account during the design phase. All the defined constraints are expressed in a simple manner by using a multi-machine modelling of the multi-phase machines. This multi-machine design is then applied to meet the specifications of a marine propeller: verifying simultaneously four design constraints, an initial 60-pole three-phase machine is converted into a 58-pole five-phase machine without changing the geometry and the active volume (iron, copper and magnet). First, a specific fractional-slot winding, which yields to good characteristics for PWM supply and winding factors, is chosen. Then, using this winding, the magnet layer is designed to improve the flux focussing. According to analytical and numerical calculations, the five-phase machine provides a higher torque (about 15%) and less pulsating torque (71% lower) than the initial three-phase machine with the same copper losses.

Inspec keywords: synchronous machines; harmonic analysis; permanent magnet machines; torque; design engineering; PWM invertors; numerical analysis

Other keywords: pulse width modulation voltage source inverters; copper losses; design methodology; torque density; multicriteria-based design approach; multimachine modelling; PMSM; fractional-slot winding; numerical calculations; winding factors; multiphase permanent magnet low-speed synchronous machines; PWM supply; pulsating torque

Subjects: Project and design engineering; Synchronous machines; Other numerical methods; Power convertors and power supplies to apparatus; Power supply quality and harmonics

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