Effect of PWM inverters on AC motor bearing currents and shaft voltages

Erdman, J.; Kerkman, R.J.; Schlegel, D.; Skibinski, G.L.

doi:10.1109/28.491472

Cited by 638 publications

(198 citation statements)

References 6 publications

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“…It is known that C b varies with the motor rotation speed [3,5,6], so its measure is uncertain. This was one of the reasons that made impossible the measurement of C rf in the case of the present work, and then the simulation result was compared again with the value obtained by the analytical formulas proposed in [6].…”

Section: Capacitance Between Rotor and Frame -C Rfmentioning

confidence: 99%

“…Each variation of this common-mode voltage excites the capacitive couplings between connecting cables, converter and motor to the ground, providing the circulation of common-mode currents [1]. These currents are responsible for the improper operation of fault-to-ground relays, electromagnetic interference (EMI) and bearing failures, among other problems [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Through the bearings, discharge currents are generated whenever the induced electrostatic voltage on the machine shaft is high enough to disrupt the dielectric rigidity of the lubricant grease. Its effect is to damage the bearing balls and races, taking it to premature failure [3,4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Induction motor capacitances calculation using FEA for common mode current studies in ATP

C.S¹,

Camacho²,

Paula³

et al. 2011

REPQJ

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Abstract. The prediction of common-mode currents in inverter-driven induction motors is necessary to propose mitigating solutions in order to prevent failures and ensure the proper operation of the entire electrical system. The motor model for these high-frequency studies is relatively simple; however, to find its parameters accurately is a very complex task. In this context, this paper presents an alternative to estimate leakage capacitances in induction motors, based on the finite element technique, through computational simulation using FEMM (Finite Element Methods Magnetics). Then, an application of the motor capacitances in an appropriate model for common-mode quantities determination is shown as an example, using the ATP (Alternative Transients Program).

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Section: Capacitance Between Rotor and Frame -C Rfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Induction motor capacitances calculation using FEA for common mode current studies in ATP

C.S¹,

Camacho²,

Paula³

et al. 2011

REPQJ

View full text Add to dashboard Cite

show abstract

“…The evidence gathered in [3] and [4] proved that the use of pulsewidth modulation (PWM) inverters can also introduce different types of bearing currents and shaft voltages. Analyses in [5]- [8] have further identified that common-mode voltages and currents in a PWM inverter are responsible for the shaft voltages and bearing currents.…”

Section: Introductionmentioning

confidence: 99%

Bearing currents and shaft voltages of an induction motor under hard- and soft-switching inverter excitation

Chen¹,

Lipo

1998

IEEE Trans. on Ind. Applicat.

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Abstract-Bearing currents and shaft voltages of an induction motor are measured under hard-and soft-switching inverter excitation. The objective is to investigate whether the soft-switching technologies can provide solutions for reducing the bearing currents and shaft voltages. Two of the prevailing soft-switching inverters, the resonant dc-link inverter and the quasi-resonant dc-link inverter, are tested. The results are compared with those obtained using the conventional hard-switching inverter. To ensure objective comparisons between the soft-and hard-switching inverters, all inverters were configured identically and drove the same induction motor under the same operating conditions when the test data were collected. An insightful explanation of the experimental results is also provided to help understand the mechanisms of bearing currents and shaft voltages produced in the inverter drives. Consistency between the bearing current theory and the experimental results has been demonstrated. Conclusions are then drawn regarding the effectiveness of the soft-switching technologies as a solution to the bearing current and shaft voltage problems.

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“…High frequency switching can exacerbate the problem because of the numerous times this common mode voltage is impressed upon the motor each cycle. PWM controlled inverters also require a greater amount of heat removal because of the additional switching losses [4][5][6].…”

Section: Introductionmentioning

confidence: 99%