Shaft Voltage Reduction Method Using Carrier Wave Phase Shift in IPMSM

Im, Jun-Hyuk; Lee, Yeol-Kyeong; Park, Jun-Kyu; Hur, Jin

doi:10.3390/en14216924

Cited by 4 publications

(7 citation statements)

References 27 publications

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“…Ignoring the bearing resistance Rb, which is generally very small, the relationship between Vb and Vng is shown in Equation (3). KBVR is defined as the bearing partial pressure ratio, which is often used to roughly evaluate the electric corrosion degree of the bearing.…”

Section: Analytical Calculation Processmentioning

confidence: 99%

“…(3) Zone 3 ⃝: the frequency of common-mode excitation is between ω P and ω N , and the amplitude of V b decreases gradually with the increase in frequency. This zone is defined as the bearing voltage drop zone.…”

Section: The Danger Zone and Safe Operating Zone Of Bearing Electric ...mentioning

confidence: 99%

“…The energy released during the discharge can cause concave pits on the surface of inner and outer rings as well as on the rolling balls of the bearing. A large number of breakdown discharges can cause great damage to the bearing, posing a serious threat to the life of the motor drive system [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Research on Analysis and Suppression Methods of the Bearing Current for Electric Vehicle Motor Driven by SiC Inverter

Yang,

Cheng,

et al. 2024

Energies

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The silicon carbide (SiC) inverter brings great advantages to the motor drive systems of new energy vehicles; however, severe challenges to the bearings also happen. The high dc bus voltage and switching frequency of SiC inverter can increase the discharge frequency and energy when the bearing grease film collapses. As a result, the bearing suffers severe electric corrosion, and the service life of the motor drive system can be shortened. In this paper, the characteristics of common-mode voltage and bearing voltage are analyzed, firstly under space vector pulse width modulation (SVPWM). After that, the common-mode equivalent circuit model of the motor drive system is established. The frequency characteristics of bearing voltage are revealed, and the safe working area is determined. Then, the frequency characteristics of bearing voltage and current are verified based on IGBT and SiC inverters in experiments. After that, by designing a common-mode filter, the bearing voltage and current are significantly attenuated. Furthermore, the active zero state PWM (AZSPWM) is adopted to reduce the common-mode voltage from the inverter. At the same time, combined with the common-mode filter, the bearing voltage and current are further reduced. The experimental results show that the switching frequency has a decisive effect on the amplitude of bearing voltage and current. The bearing voltage can be attenuated to around half of the reference bearing voltage by using the common-mode filter and AZSPWM strategy, respectively. The combination of the common-mode filter and AZSPWM strategy can reduce the bearing voltage to around one-fourth of the reference bearing voltage, which can effectively reduce the breakdown time and discharge energy of the grease oil film.

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Section: Analytical Calculation Processmentioning

confidence: 99%

Section: The Danger Zone and Safe Operating Zone Of Bearing Electric ...mentioning

confidence: 99%

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Research on Analysis and Suppression Methods of the Bearing Current for Electric Vehicle Motor Driven by SiC Inverter

Yang,

Cheng,

et al. 2024

Energies

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“…If the bearing is severely damaged, other serious motor faults may occur. To solve this problem, various studies are being conducted to reduce CMV and shaft voltage [17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Novel Structure of Shield Ring to Reduce Shaft Voltage and Improve Cooling Performance of Interior Permanent Magnet Synchronous Motor

Kang,

Heo,

Kim

et al. 2024

Electronics

Self Cite

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The voltage of the battery system is increased to increase the efficiency of the electric motor drive system. Additionally, the space vector pulse width modulation (SVPWM) technique is used to ensure high controllability. However, high-voltage and high-speed PWM switching controls for system efficiency generate high common mode voltage (CMV), and shaft voltage is induced in the bearing. This results in a shortened bearing life and potential damage. Therefore, this paper proposes a method to reduce the shaft voltage of the motor through a novel hybrid shield ring structure. It also analyzes how to improve the cooling performance of the motor using a shield ring. First, the parasitic capacitance inside the motor is analyzed. Then, the shaft voltage reduction technology is analyzed according to the material of the shield ring. Finally, experiments validate the proposed method. Additionally, the temperature characteristics of the main part of the motor are analyzed through an experiment in consideration of the shield ring.

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“…The time taken to turn the thyristor on/off results in an unbalanced output from the inverter and generates a common-mode voltage with a high frequency at the neutral terminal of the motor windings. The motor winding, rotor, frame, bearing rollers and raceways act as capacitive electrodes, which form a coupling capacitance in the motor and provide a grounding path for the common-mode voltage [3][4][5][6]. In addition, the asymmetric magnetic flux inside the motor can induce the non-zero voltage at the shaft, which causes the circulating current to move through the "one end bearing-frame-other end bearing-rotor".…”

Section: Introductionmentioning

confidence: 99%

Motor Bearing Damage Induced by Bearing Current: A Review

Xue

Han

et al. 2022

Machines

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The occurrence of the motor shaft voltage and bearing current caused by the inverter will aggravate bearing damage and lead to the premature failure of bearings. Many types of equipment are being shut down due to bearing currents, such as filters, insulated bearings and grounding brushes. Traditional suppression measures cannot eliminate the bearing current and the bearing damage mechanism under the bearing current is not clear. In this paper, the damage caused by the bearing current to bearings is analyzed in detail. The influences of different working conditions on the bearing current and the damage caused are discussed. The source of bearing currents is introduced and the bearing current model under different working conditions is reviewed. An outlook for future studies is proposed, based on the current research status and challenges.

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Shaft Voltage Reduction Method Using Carrier Wave Phase Shift in IPMSM

Cited by 4 publications

References 27 publications

Research on Analysis and Suppression Methods of the Bearing Current for Electric Vehicle Motor Driven by SiC Inverter

Research on Analysis and Suppression Methods of the Bearing Current for Electric Vehicle Motor Driven by SiC Inverter

Novel Structure of Shield Ring to Reduce Shaft Voltage and Improve Cooling Performance of Interior Permanent Magnet Synchronous Motor

Motor Bearing Damage Induced by Bearing Current: A Review

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