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This paper proposes a novel transient 3D lumped-parameter (LP) thermal model and a 3D finite-element (FE) thermal model of a triple redundant 9-phase permanent magnet-assisted synchronous reluctance machine to predict the asymmetric temperature distribution under various fault conditions. Firstly, the predicted transient and steady-state temperatures are compared between the 3D LP and the 3D FE thermal models under fault conditions with uneven loss distribution. Also, the temperatures predicted by the LP and FE thermal models which account a number of practical issues are comprehensively compared with the test results under healthy and short-circuit fault conditions. The relative merits of the two thermal models are discussed. It is shown that both models have reasonable accuracy in predicting the machine thermal behavior under fault conditions and can be chosen according to the requirements.

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This is a repository copy of Electromagnetic-thermal coupled simulation under various fault conditions of a triple redundant 9-phase PMASynRM.

In permanent magnet synchronous motor (PMSM) servo systems, the saliency ratio is an important factor in sensorless control and flux-weakening control. Compared with the interior PMSM (IPMSM) with distributed windings, the IPMSM with concentrated windings gains more popularity in servo system applications. However, the saliency ratio of current fractional slot concentratedw i n d i n g s(F S C W s)I P M S Mi sl o wa n dh a r dt oi n c r e a s e ,w i t h o u tm u c hl i t e r a t u r e investigating how to improve the ratio. In this paper, the components of d-a n dq-axes inductances of FSCW IPMSM are determined, a novel concept named mechanical phase region is introduced and the key parameters influencing the saliency ratio of FSCW PMSMs have been investigated through thorough theoretical analysis and simulation. The design principles on increasing the saliency ratio of FSCW IPMSMs are proposed and the maximum saliency ratio of a 10 poles 12 slots motor is obtained. On the basis of the theory, a novel rotor structure with higher saliency ratio is designed. A new experimental method of measuring d-a n dq-axes inductances closest h i sp a p e rw i t ht h r e e experimental prototypes built to verify the theory and simulation results.