The cogging torque measurement through a new validated methodology

Ferraris, Luca; Franchini, Fausto; Pošković, Emir

doi:10.1109/cpe.2017.7915204

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…The dynamic measurement is usually performed using torque transducers [3], [9]- [14], often with bias torque for a measuringrange extension, which must have sufficient bandwidth and accuracy to capture all cogging harmonics. The driving motors used include hydraulic motors [9], stepper motors [11], [13], [14], and brushed or brushless motors [13], often with a gear box in between to minimize the driving motor's influence on the motor under test (MUT). (However, a gear box usually has the disadvantage of backlash, which can affect the measurement results.)…”

Section: Cogging Torque Its Measurement and Particularities Of mentioning

confidence: 99%

Rheometer-Based Cogging and Hysteresis Torque and Iron Loss Determination of Sub-Fractional Horsepower Motors

Leitner

Krenn

Gruebler

et al. 2020

IEEE Trans. on Ind. Applicat.

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Accurately measuring the cogging torque, hysteresis torque, and iron losses of permanent magnet (PM) motors is a challenging task. This is especially true for sub-fractional horsepower (SFHP) variants used, e.g., in auxiliary drives for automotive fan and pump applications. Their cogging torque and hysteresis torque peak values are often in the sub-milli-Newton meter range, causing conventional measuring methods and devices to fail as especially friction impedes the measurement significantly. Moreover, their iron losses are hard to determine and usually merely estimated in the literature. This article presents an unconventional rheometer-based method to determine both 1) the cogging torque and hysteresis torque of SFHP PM motors and 2) their iron losses by evaluating the observed offset torque. Two SFHP outer-rotor PM motor topologies for fan applications are analyzed, i.e., a claw-pole motor and a salient-pole motor. The results show that, with the proposed setup, settings, and evaluation, a rheometer can successfully be used to determine the cogging torque and hysteresis torque waveforms in the sub-milli-Newton meter range and the iron losses of SFHP motors, both with excellent accuracy.

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Section: Cogging Torque Its Measurement and Particularities Of mentioning

confidence: 99%

Rheometer-Based Cogging and Hysteresis Torque and Iron Loss Determination of Sub-Fractional Horsepower Motors

Leitner

Krenn

Gruebler

et al. 2020

IEEE Trans. on Ind. Applicat.

View full text Add to dashboard Cite

show abstract

“…In addition, they are scaled to measure the average torque (dc component of the torque), what can seriously compromise their resolution measuring torque pulsations since only a small portion of the measuring range will be excited by the torque pulsation; furthermore, often they are also sensitive to radial forces applied in the direction perpendicular to their axis of measurement (i.e. centrifugal forces) producing cross coupling between axis and creating magnitude errors in the torque measurement [20]- [23], [26]. Wireless transmission of strain gauge signals direct attached to the rotor shaft by means of telemetry and wireless power supply (induction, batteries) was reported in [27]- [28].…”

Section: Introductionmentioning

confidence: 99%

Wireless Torque Pulsations Measurement System for PMSMs

Martinez

Fernández

Reigosa

et al. 2020

IEEE Trans. on Ind. Applicat.

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Torque pulsations are one of the major concerns in permanent magnet synchronous machines (PMSMs). 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 noninvasive, wireless vibration measurement system aimed to provide precise estimates of torque pulsations. The system is mounted on the rotor shaft of the PMSM, i.e. there is no mechanical coupling, and allows on-line measurement without interfering with the normal operation of the machine. 1

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“…demagnetization) in existing machines. Existing torque pulsation measurement systems include: conventional rotary torque transducers based on strain gauges [20], [22]- [23], Ferraris sensor [19], piezoelectric accelerometers [19], acceleration estimation using rotary encoder [19] and a weight variation of a beam attached to the rotor [21]. However, all existing methods show some limitation.…”

Section: Introductionmentioning

confidence: 99%

“…Rotary torque transducers are the most popular option [20]; however, these sensors are relatively bulky, and can introduce resonances into the system, which could hide the actual vibration produced by the machine [22]. In addition, 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]. A beam attached to the rotor was proposed in [21]; its use being limited to zero speed [21], measuring in the whole speedtorque map not being possible.…”

Section: Introductionmentioning

confidence: 99%

Wireless Torque Pulsations Measurement System for PMSMs

Martinez

Fernández

Reigosa

et al. 2018

2018 IEEE Energy Conversion Congress and Exposition (ECCE)

View full text Add to dashboard Cite

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. 1

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The cogging torque measurement through a new validated methodology

Cited by 7 publications

References 38 publications

Rheometer-Based Cogging and Hysteresis Torque and Iron Loss Determination of Sub-Fractional Horsepower Motors

Rheometer-Based Cogging and Hysteresis Torque and Iron Loss Determination of Sub-Fractional Horsepower Motors

Wireless Torque Pulsations Measurement System for PMSMs

Wireless Torque Pulsations Measurement System for PMSMs

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