Stator and Rotor Shape Designs of Interior Permanent Magnet Type Brushless DC Motor for Reducing Torque Fluctuation

Lee, Sun-Kwon; Kang, Gyu-Hong; Hur, Jin; Kim, Byoung-Woo

doi:10.1109/tmag.2012.2201455

Cited by 62 publications

(15 citation statements)

References 7 publications

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“…The distribution of magnetic flux density [1][2][3]13] and the variation in magnetic energy [11,13] are used to reveal the formation of torque ripple or cogging torque. In order to understand the torque behavior in the OR-SPM machine, the variation in energy that is stored in the magnetic field along the air gap of the machine should be examined.…”

Section: Effect Of the Permanent Magnet On Energy Changementioning

confidence: 99%

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New magnet shape for reducing torque ripple in an outer-rotor permanent-magnet machine

Özoğlu¹

2017

Turk J Elec Eng & Comp Sci

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Torque ripple is a major problem for permanent-magnet (PM) machines. It is examined by focusing on the magnetic circuit of the PM machine. Because there is a relationship between the torque ripple and the magnetic energy that is stored in the magnetic field along the air gap of the PM machine, a variation in the magnetic energy was revealed initially. A new magnet geometry is obtained by forming ledges and notches in the permanent magnets to modify the variation of the magnetic energy and the fluctuation in torque. Thus, a new PM design is proposed in this study to minimize the torque ripple of an outer-rotor surface-mounted PM machine. An improvement of 44.6% in the torque ripple is achieved thanks to the new magnet design. In addition, improvements are made in the average torque and the total harmonic distortion of the back electromotive force.

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Section: Effect Of the Permanent Magnet On Energy Changementioning

confidence: 99%

“…A partly enlarged air gap formed by the unequal outside diameter of the rotor and cutting of the stator core was introduced in IPM brushless DC (IPM BLDC) motors [3].…”

Section: Introductionmentioning

confidence: 99%

New magnet shape for reducing torque ripple in an outer-rotor permanent-magnet machine

Özoğlu¹

2017

Turk J Elec Eng & Comp Sci

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“…There are two different approaches to reduce torque ripple in a motor. In the first approach, attempts are made to reduce the torque ripple by modifying the physical structure of the stator and rotor of the motor (including tooth, slots, windings and PMs) [3][4][5][6][11][12][13]. In the second approach, the torque ripple is reduced by applying an appropriate control method, which is the aim of the present paper.…”

Section: Introductionmentioning

confidence: 99%

“…The reasons for generating the torque ripple by these motors are as follows [1]: (a) Harmonic contents of back‐electromotive force (BEMF) and current waveforms [2]. (b) Cogging torque ripple produced by interaction between the stator teeth and rotor PMs [3–6]. (c) Non‐ideal slopes of phase currents contributing in commutation [7, 8].…”

Section: Introductionmentioning

confidence: 99%

Torque ripple and switching frequency reduction of interior permanent magnet brushless direct current motors using a novel control technique

Faiz

Heidari

Sharafi

2019

IET Power Electronics

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Although interior permanent magnet brushless direct current (IPMBLDC) motors have higher torque and power density compared to surface-mounted PMBLDC motors, the reluctance torque of IPMBLDC motors generates higher torque ripples. This study introduces a new current waveform as a reference to control the IPM motors while keeping the total developed torque constant. It also helps to considerably reduce the torque ripple of the motors. The experimental results show that this method significantly reduces the damaging impact of the reluctance torque ripple without complicating computations or changing the stator and rotor structures of the motor. Additionally, the switching frequency and consequently switching losses are reduced using the proposed technique.

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“…In BLDC motor, armature current cannot be commutated immediately due to the influence of the armature winding inductance, which leads to the generation of current ripple [2]. The torque ripple due to the current ripple is the main drawback of BLDC motor that generates speed oscillations, vibrations, and noises [3, 4]. Several pulse‐width modulation (PWM) methods have been proposed over the past few decades to solve this key issue.…”

Section: Introductionmentioning

confidence: 99%

Hybrid converter topology for reducing torque ripple of BLDC motor

Vaiyapuri

Jeevananthan

2017

IET Power Electronics

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This study investigates the torque ripple performance of brushless DC (BLDC) motor drive system by integrating both modified single-ended primary inductor converter (SEPIC) and silicon carbide metal-oxide-semiconductor field-effect transistor based three-level neutral-point-clamped (NPC) inverter. In BLDC motor, the high commutation torque ripple is an important origin of vibration, speed ripple and prevents the use of the BLDC motor drive system in high-performance and high-precision applications. For torque ripple reduction, the modified SEPIC converter is employed at the entrance of the three-level NPC inverter, which regulates the DC-link voltage according to the motor speed. Moreover, the three-level NPC inverter is employed as a second-stage converter to suppress current ripple for further torque ripple reduction. Finally, the performance of the proposed hybrid converter topology is verified by simulation and laboratory experimental results.

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Stator and Rotor Shape Designs of Interior Permanent Magnet Type Brushless DC Motor for Reducing Torque Fluctuation

Cited by 62 publications

References 7 publications

New magnet shape for reducing torque ripple in an outer-rotor permanent-magnet machine

New magnet shape for reducing torque ripple in an outer-rotor permanent-magnet machine

Torque ripple and switching frequency reduction of interior permanent magnet brushless direct current motors using a novel control technique

Hybrid converter topology for reducing torque ripple of BLDC motor

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