Performance Analysis of Synchronous Reluctance Motor with Limited Amount of Permanent Magnet

Abstract

This paper analyzes the performance of a synchronous reluctance motor (SynRM) equipped with a limited amount of a permanent magnet (PM). This is conventionally implemented by inserting PMs in rotor flux barriers, and this is often called the PM-assisted SynRM (PMa-SynRM). However, common PMa-SynRMs could be vulnerable to irreversible demagnetization. Therefore, motor performance and PM demagnetization should be simultaneously considered, and this would require the PM to be properly arranged. In this paper, various rotor configurations are carefully studied and compared in order to maximize the motor performance, avoid irreversible demagnetization and achieve higher PM utilization. Moreover, the field weakening capability is investigated and improved by regulating armature excitation. A particular rotor type with flux intensification was found to possess higher PM utilization, lower demagnetization possibility with fairly high performance. Thus, suitable rotor configurations are recommended for certain applications.

Electromagnetic nonlinear parametric study of the SynRM using FEM method

“…This is the joule effect. This power lost by heating is called joule losses, it can be calculated by (10). Where: Rs is the resistance of a stator phase.…”

“…In addition, SynRM is used in a wide speed range, low, medium [8] and high speeds [9]. Numerous researchs and studies have been carried out on SynRM covering different axes: performance [10], modeling [11], [12], control [13], home appliance application [14], traction application [15], industrial opportunities [16], potential application [17], [18], and thermal analysis [19], [20]. Several contributions have mainly been the subject of this machine.…”

Detection of Partial Demagnetization Faults in Five-Phase Permanent Magnet Assisted Synchronous Reluctance Machines

“…In order to achieve high power or torque densities and to be resistant against demagnetization faults, a minimum volume or quantity of PMs must be inserted in the rotor. However, low PM content could only marginally increase the torque production, due to the low PM torque contribution compared to the total torque [1]. Under some circumstances, such as the application of field weakening, or the effects of high temperatures, high vibration levels or short circuit currents, fPMa-SynRMs can become irreversibly demagnetized, thus affecting their performance and safe operation.…”

“…Synchronous reluctance machines (SynRMs) offer appealing characteristics, such as competitive cost, high overload capability and robustness [1]. However, SynRMs exhibit lower torque and power densities as well as lower power factor compared to permanent magnet synchronous machines (PMSMs).…”

“…However, SynRMs exhibit lower torque and power densities as well as lower power factor compared to permanent magnet synchronous machines (PMSMs). By inserting permanent magnets (PMs) in the flux barriers sculpted in the rotor, such weaknesses can be minimized, thus, resulting in a permanent magnet assisted SynRM (PMa-SynRM) [1]. PMa-SynRMs exhibit high torque and power density because the extra reluctance torque component [2] adds up to the alignment torque; these characteristics are interesting for automotive applications [3].…”