Analysis of torque ripple due to phase commutation in brushless DC machines

Carlson, R.; Lajoie‐Mazenc, M.; Fagundes, J.C.d.S.

doi:10.1109/ias.1990.152200

Cited by 121 publications

(39 citation statements)

References 2 publications

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“…7. The deviations of the current waveforms deteriorate the drive performance [4] as they produces a torque ripple and a decrease in the available torque, i.e. in the average torque developed by the motor over a supply period, which become consistent at high speeds.…”

Section: A Current Waveformsmentioning

confidence: 98%

Characterization and improved control of a brushless DC drive with in-wheel motor

Bertoluzzo

Buja

Pavoni³

2008

2008 13th International Power Electronics and Motion Control Conference

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The paper deals with a brushless DC drive belonging to the propulsion system of an innovative light electric vehicle. The drive consists of an in-wheel motor fed by a voltage-controlled inverter. At first, the parameters of the motor and the mechanical characteristics of the drive are measured; the latter results are supported by a formulation of the torque-speed equations. Afterwards, a novel strategy for the voltage control of the drive during the commutations is presented, intended to eliminate the torque ripple and the decrease in the available torque due to the commutations. Improvement in the drive performance achieved with the novel strategy is documented by simulatio

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Section: A Current Waveformsmentioning

confidence: 98%

Characterization and improved control of a brushless DC drive with in-wheel motor

Bertoluzzo

Buja

Pavoni³

2008

2008 13th International Power Electronics and Motion Control Conference

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“…2. However, in practical, the currents does not commutate instantaneously due to the effect of stator winding inductance and freewheeling diode [1], [12] as shown in Fig.3. This leads to high torque ripple in BLDC motor.…”

Section: Instroductionmentioning

confidence: 99%

“…Since an ideal BLDC motor theoretically has a trapezoidal back-EMF waveform, the BLDC motor has to be fed by an ideal rectangular current waveform. In practice, the BLDC motor drive inherently produces the current ripple during commutations because the motor current naturally flows through the freewheeling diodes [1]. To improve the torque ripple, the methods in [2]- [3] proposed the novel PWM to eliminate the ripple current by using PWM_ON_PWM mode.…”

Section: Instroductionmentioning

confidence: 99%

Sensorless control of BLDC motor drive with 150° conducting mode to minimize torque ripple

Promthong

Konghirun

2013

2013 International Conference on Electrical Machines and Systems (ICEMS)

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This paper presents the sensorless control of BLDC motor drive with 150 ο conducting mode for minimizing the torque ripple. The proposed method defines the energizing interval in phase voltage commutation every 30 electrical degrees. In each phase commutation, two or three switches conduct alternately in order to obtain the quasi sinusoidal phase voltage waveform. Compared with traditional control, the torque ripple of BLDC motor can be significantly reduced by using the proposed method. Both simulation and experimental results have been presented to validate the reduction of torque ripple by using the proposed method. I. INSTRODUCTIONRecently, the brushless dc (BLDC) motor is widely used in industrial applications and home appliances due to its high efficiency, high power density and low maintenance. However, the BLDC motor drive requires a position sensor which reduces the reliability of overall system. Also, the BLDC motor drive produces the torque pulsation. Torque pulsation produced in the conventional BLDC motor drive system causes the oscillating speed and resonance in mechanical portions of the drive, leading to acoustic noises and observable vibration in machines. Since an ideal BLDC motor theoretically has a trapezoidal back-EMF waveform, the BLDC motor has to be fed by an ideal rectangular current waveform. In practice, the BLDC motor drive inherently produces the current ripple during commutations because the motor current naturally flows through the freewheeling diodes [1]. To improve the torque ripple, the methods in [2]- [3] proposed the novel PWM to eliminate the ripple current by using PWM_ON_PWM mode. However, the commutation interval time is determined by calculations which require the computation time and higher performance MCU's. In [4], the effective commutation torque ripple using different PWM modes was presented. The results showed that the PWM-ON pattern achieves the smallest torque ripple. Another method of torque ripple reduction in a sensorless BLDC motor drive was proposed in [5]. Their proposed method used the measured terminal phase voltages to determine the commutation intervals and then computed the optimal duty ratio applied during commutation intervals to minimize the torque ripple. However, it did not provide the good performance in high speed operation because of limitation of duty cycle compensation.Although the fed current could be typically controlled as rectangular waveform, the torque ripple is still produced due to the non-ideal back EMF. The ideal back EMF would be trapezoidal shape. There are many reasons of non-ideal back EMF in the BLDC motor such as non-uniformity of magnetic material, stator winding configuration, tooth winding with pole shoe, and etc. as shown in Fig.1 [6]. Fig.1 Comparative FEA back EMF's waveforms [6]In order to reduce the torque ripple in BLDC motor with non-ideal back EMF, In [7], the new current control method was adopted. The duty cycle was calculated in the current controller by measuring the angular position and the offline measured back ...

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“…7, this phenomenon can create transient overcurrents in the inverter switches which are undetectable using a single current sensor in the dc link [ 191. Various techniques have been proposed for modifying the current PWM regulation scheme in order to prevent these overcurrents and to reduce the amplitude of the resulting torque transients [lY], [20].…”

Section: Torque Ripplementioning

confidence: 99%

Motion control with permanent-magnet AC machines

Jahns¹

1994

Proc. IEEE

152

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Motion control techniques have been developed to exploit the high efficiency and extremely fast dynamic response capabilities of permanent-magnet ac (PMAC) machines. Control techniques are reviewed separately for the two major classes of PMAC machines referred to hereinafter as trapezoidal (i.e., brushless dc) and sinusoidal machines. While trapezoidal PMAC machine drives are distinguished by their controls simplicity and minimal sensor requirements, sinusoidal PMAC machine drives offer opportunities for extremely smooth torque production and extended high-speed operating runges. Advanced PMAC machine control topics including sensor elimination techniques and robust servocontrol algorithms are reviewed, concluding with a discussion of PMAC machine drive application trends.

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Analysis of torque ripple due to phase commutation in brushless DC machines

Cited by 121 publications

References 2 publications

Characterization and improved control of a brushless DC drive with in-wheel motor

Characterization and improved control of a brushless DC drive with in-wheel motor

Sensorless control of BLDC motor drive with 150° conducting mode to minimize torque ripple

Motion control with permanent-magnet AC machines

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Analysis of torque ripple due to phase commutation in brushless DC machines

Cited by 121 publications

References 2 publications

Characterization and improved control of a brushless DC drive with in-wheel motor

Characterization and improved control of a brushless DC drive with in-wheel motor

Sensorless control of BLDC motor drive with 150&#x00B0; conducting mode to minimize torque ripple

Motion control with permanent-magnet AC machines

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Product

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Sensorless control of BLDC motor drive with 150° conducting mode to minimize torque ripple