• Title, Summary, Keyword: torque ripple

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Torque Ripple Reduction for Permanent Magnet Synchronous Motor using Harmonic Current Injection (고조파 전류를 이용한 영구자석형 동기 전동기의 토크 리플 저감)

  • Kwon, Soon-O;Lee, Jeong-Jong;Lee, Geun-Ho;Hong, Jung-Pyo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.10
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    • pp.1930-1935
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    • 2009
  • This paper deals with the torque ripple reduction of permanent magnet synchronous motor using harmonic current injection. Torque ripple of electric motor reduces system stability and performances, therefore efforts to reduce torque ripple are exerted in the design process. Torque ripple can be reduced by appropriate pole/slot combination, skew of rotor or stator, design of magnetic circuit, etc. In addition, torque ripple can be also reduced by input voltage and current, and many researches have been conducted to reduce torque ripple for six-step drive. Torque ripple reduction for current vector controlled permanent magnet synchronous motor also have been conducted and verified by investigating back emf wave form. Torque ripple reduction in this paper started from getting torque profile according to input current and electrical angle calculated by FEA, then instantaneous currents at each electrical angles for constant torque are calculated and applied to experiments. Therefore, 0% of torque ripple can be obtained theoretically with harmonic current injection. In order to maximize the effect of torque ripple reduction, a BLDC motor having high harmonic component of back emf is chosen. With sinusoidal current drive, over 100% of torque ripple is obtained initially, then 0.5 % of torque ripple is obtained by FEA using harmonic current injection. The effect is verified by experiment and the presented method can be effectively applicable to Electric Power Steering(EPS).

Compensation Algorithm for Periodic Torque Ripple of AC Motors (교류전동기의 주기적인 토크리플 보상알고리즘)

  • Kim, Byong-Seob;Choi, Jong-Woo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.11 no.6
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    • pp.551-557
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    • 2006
  • The electrical frequency synchronized periodic torque ripple exits in the AC motor. There are various sources of torque ripple in AC motor such as current measurement error, dead time, etc. This paper proposes a compensation algorithm which suppresses undesired side effect known as the periodic torque ripple of AC motor. The torque ripple compensation classified as the speed ripple detector and torque ripple compensator. This paper proves a speed ripple minimization at steady state by analysis of torque ripple compensator. A new speed ripple detector improves the performance of torque ripple compensation algorithm. The simulation and experimental results show that the compensation algorithm is effective and the torque ripple compensation method improves the performance of speed ripple detector by eliminating torque ripples effectively.

Active Cancellation of PMSM Torque Ripple Caused by Magnetic Saturation for EPS Applications

  • Lee, Geun-Ho
    • Journal of Power Electronics
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    • v.10 no.2
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    • pp.176-180
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    • 2010
  • This paper deals with a control method to reduce the torque ripple of a permanent magnet synchronous motor (PMSM) for electric power steering (EPS) systems. Such an application requires a very low torque ripple in order to maintain a good steering feel. However, because of spatial limitations, it cannot help having a partial saturation in the iron core of the PMSM for an EPS system, and this saturation results in a significant torque ripple. Thus, this paper analyzes the torque ripple caused by the magnetic saturation of a PMSM and proposes a method with respect to inductance measurement to verify the partial saturation. In addition, it is shown that a compensation current is needed in order to minimize the torque ripple when a PMSM is driven in the high torque region. The estimation process of the current and the torque ripple decreased by the current are presented and verified with test results.

Torque Ripple Minimization in Direct Torque Control of Brushless DC Motor

  • Li, Zhenguo;Zhang, Songfa;Zhou, Shenghai;Ahn, Jin-Woo
    • Journal of Electrical Engineering and Technology
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    • v.9 no.5
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    • pp.1569-1576
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    • 2014
  • This paper mainly proposes a direct torque control strategy to minimize torque ripple in brushless DC (BLDC) motor. BLDC motor has large current and torque ripple when one voltage vector applied in one cycle due to its low inductance. Hence, this paper proposed a hysteresis torque control with PWM mode to control the resultant torque. Moreover, when the direct torque control system is operating during the two-phase half-bridge $120^{\circ}$ conduction mode, large torque ripple in commutation area appears every 120 electrical degree. Based on analyzing the root of torque ripple in detail, lookup tables of switching devices states for new half-bridge modulation mode in the positive and negative reference torque put forwarded. Finally, simulations by MATLAB software and experiment results from DSP are presented to verify the feasibility and effectiveness of the proposed strategy operating in four-quadrant operation.

Novel Periodic Torque Ripple Compensation Scheme in Vector Controlled AC Motor Drives (벡터제어 교류전동기 구동에서의 새로운 주기적 토오크 리플 보상기법)

  • Choe, Jong-U
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.9
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    • pp.530-536
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    • 2002
  • In this paper, a new torque ripple compensator is proposed. The proposed torque ripple compensator utilizes only speed information, so it can be easily applied to an existing motor drive system by including the algorithm. The stability analysis is discussed. From the discussion, the proper gain selection method, which makes the compensator stable and fast convergent, is also presented. The experimental results are presented and show the torque ripple reduction capability of the proposed scheme.

Torque ripple reduction of a closed-loop driven permanent magnet stepping motor by lead angle control (Lead angle 제어에 의한 폐루프 운전 영구자석형 스테핑 전동기의 토오크 리플 저감)

  • Lee, Hyun-Chang;Jun, Ho-Ik;Woo, Kwang-Joon
    • Journal of Institute of Control, Robotics and Systems
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    • v.3 no.3
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    • pp.280-288
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    • 1997
  • In this paper, we will show that the torque ripple in closed-loop drives of permanent magnet stepping motors is reduced as properly selected lead angle control method. We propose an instantaneous torque equation, which is the function of lead angle, to estimate the influence on torque ripple. We design a closed-loop lead angle control system based on the proposed instantaneous torque equation and measure the instantaneous torque in various excitation modes. It is shown that torque ripple is greatly reduced, as seen from the experimental results as well as from the computer simulation results. For example, torque ripple reduced from 78.25% to 46.82% in the case of 50 PPS single-phase excitation mode operation.

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Sensitivity Analysis of Geometrical Parameters of a Switched Reluctance Motor with Modified Pole Shapes

  • Balaji, M.;Ramkumar, S.;Kamaraj, V.
    • Journal of Electrical Engineering and Technology
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    • v.9 no.1
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    • pp.136-142
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    • 2014
  • A major problem in Switched Reluctance Motor (SRM) is torque ripple, which causes undesirable acoustic noise and vibration. This work focuses on reducing the undesirable torque ripple in SRM by modifying stator and rotor geometry. This paper presents a comparative study on torque ripple minimization in SRM with modified pole shapes such as stator pole taper, stator pole face with non-uniform air gap and pole shoe attached to rotor pole. Further this paper presents a detailed sensitivity analysis of the effect of different geometrical parameters that alter the pole face shapes on the performance of SRM. The analysis is performed using finite-element method considering average torque and torque ripple as performance parameters. Based on the analysis, a design combining stator pole taper with non-uniform air gap is proposed to improve the torque characteristics of SRM. The dynamic characteristics of the proposed design are simulated and the results show satisfactory reduction in torque ripple.

Reduction of Torque Ripple in a BLDC Motor Using an Improved Voltage Control (개선된 전압제어를 이용한 BLDC 전동기의 토크맥동저감)

  • Song, Jeong-Hyun;Jang, Jin-Seok;Kim, Byung-Taek
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.2
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    • pp.145-150
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    • 2010
  • This paper deals with reduction of torque ripple in a brushless DC motor with input voltage control. The commutation torque ripple can be controlled with varying input voltage, but cogging torque is independent on it. So, in this paper a strategy for minimizing torque ripple is proposed by offsetting the cogging torque with deliberate voltage control. The optimal condition is determined with variable voltage levels and advance angles. As results, it is shown that the method causes 63% decrease of torque ripple.

Reduction of Electromagnetic Torque Ripple in High-Speed, High-Load Brushless DC Motors used for Automobile Parts (자동차 부품용 고속, 고부하 BLDC 모터내의 전자기적 토크 맥동 저감)

  • 황상문
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.4
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    • pp.39-46
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    • 1998
  • For permanent magnet brushless DC motors used for high speed fuel pumps, torque ripple is an important origin of vibration, acoustic noise and speed fluctuation. In this paper, the output torque profile of a PM motor with one phase energized is decomposed into the commutation torque, the reluctance torque and the armature reaction torque according to their source origins. It verifies that the output torque profile is qualitatively equivalent to the BEMF profile for low reluctance motors. This paper discusses the effect of magnet pole shaping and magnet arc length on the output torque and torque ripple. A magnet edge shaping is proposed to design a trapezoidal BEMF motor without torque ripple, with minimal sacrifice of the maximum output torque.

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A study on Analysis of Steering Feel for Electric Power Steering System Due to Motor Torque Ripple (모터 토크리플에 기인하는 전동식 조향장치 시스템의 조향감 해석에 대한 연구)

  • Kim, Chan-Mook;Han, Jeong-Hun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.785-790
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    • 2011
  • This paper presents the effects of an assisting motor torque ripple on a driver's steering feeling using a simulink. The EPS(Electric Power Steering) System is modeled as a 5 degrees of freedom for simulation. To find out the influence of a torque ripple on a driver's steering feeling, which is the purpose of this study, we observed the assisting torque in various different speeds, when the torque ripple increased by 0%~40%. The torque ripple had a small but definite influence on the assisting torque, and it had a greater influence in low speeds rather than high speeds.

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