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access icon free Time-variant PM flux linkages and magnetising inductances of a line-start PM synchronous motor with composite solid rotor

© The Institution of Engineering and Technology
Received 03/01/2019, Accepted 29/05/2019, Revised 18/05/2019, Published 29/05/2019

This study conducts a deep research on a line-start permanent-magnet synchronous motor (LSPMSM) with a composite solid rotor through detailed analyses of two sets of intrinsic motor parameters, i.e. (i) the flux linkages stemming from permanent-magnet (PM) poles, or the so-called PM flux linkages, and (ii) the magnetising inductances related to the stator–rotor magnetic couple. The analyses proceed by separating the motor starting process into a series of sub-states with different slips. At each sub-state, the PM flux linkages and magnetising inductances are both susceptible to the varying saturation of motor cores and hence perform as time-dependent quantities alternating exactly in the slip frequency. Accordingly, these parameters are determined as combinations of cosine functions indicating the quantity alternation, by which the rotor resistances and self-inductances are obtained at the same time. Assembly of all the confirmed motor parameters generates an analytical model of the studied LSPMSM. Responses of this model stay totally in good agreement with those from the finite-element method, and the close result correlation offers an effective validation of the analyses presented in this work.

Inspec keywords: stators; finite element analysis; permanent magnet motors; starting; synchronous motors; rotors

Other keywords: detailed analyses; deep research; rotor resistances; permanent-magnet poles; different slips; composite solid rotor; synchronous motor; confirmed motor parameters; stator–rotor magnetic couple; magnetising inductances; quantity alternation; line-start permanent-magnet; self-inductances; intrinsic motor parameters; PM flux linkages; motor cores; time-dependent quantities; motor starting process; studied LSPMSM; time-variant

Subjects: Finite element analysis; Synchronous machines; Numerical analysis; Control of electric power systems

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