Abstract
Torque pulsations are one of the major concerns in permanent magnet synchronous machines (PMSMs) operation. Torque pulsations can be mitigated by proper machine design and/or by control. Independently of the means being used, precise measurement of torque pulsation is highly desirable for the validation and improvement of machine designs and control strategies. This paper proposes a non-invasive, wireless vibration measurement system aimed to provide precise estimates of torque pulsations. The system is mounted on the rotor shaft of the PMSM, without including any mechanical coupling, providing on-line torque pulsation measurement and without interfering with the normal operation of the machine. The proposed concept has been validated experimentally.11This work was supported in part by the Research, Technological Development and Innovation of the Spanish Ministry Economy and Competitiveness, under grant MINECO-17-ENE2016-80047-R and by Thyssenkrupp under grant CAT-003-17.
Highlights
Permanent magnet synchronous machines (PMSMs) provide high efficiency, high power density and good dynamic response compared to other types of electrical machines [1]-[4]
Mechanical torque pulsations can be mitigated by proper machine design, methods that have been proposed for this include dummy slots [15], [18], stator slots skewing [15], the use of factional number of slots per pole [25], magnet shifting [25] or magnet magnetization shaping [16]
This paper presents a wireless, shaft-mounted torque pulsation measurement system
Summary
Permanent magnet synchronous machines (PMSMs) provide high efficiency, high power density and good dynamic response compared to other types of electrical machines [1]-[4]. Rotary torque transducers are the most popular option [20]; these sensors are relatively bulky, and can introduce resonances into the system, which could hide the actual vibration produced by the machine [22] They must be scaled to measure the average torque, what can seriously compromise their resolution measuring torque pulsations, their limited bandwidth and high cost being often further concerns [20], [23]. Systems based on a Ferraris sensor, a rotary encoder system or a piezoelectric accelerometer [19] overcome the bandwidth limitation of rotary torque transducers and can measure torque pulsations with high resolution.
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