Microcomputer Control for Sensorless Brushless Motor

Iizuka, Kenichi; Uzuhashi, Hideo; Kanō, Mikio; Endo, Tsunehiro; Mohri, K.

doi:10.1109/tia.1985.349715

Cited by 382 publications

(105 citation statements)

References 2 publications

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“…INTRODUCTION N UMEROUS sensorless control techniques have been developed for brushless dc (BLDC) and brushless ac (BLAC) machines. For example, methods based on the detection of the zero crossing of the back-electromotive-force (EMF) waveforms [1], [2] are simple, and various commercial ICs are available for BLDC drives. However, they are not applicable to BLAC operation, or even to BLDC operation if the commutation advance or the current decay in the freewheeling diodes is greater than 30 electrical, since the zero crossing of the back EMFs cannot then be detected.…”

Section: Sensorless Flux-weakening Control Of Permanent-magnet Brushlmentioning

confidence: 99%

“…Moreover, the hardware is relatively complex and implementation is difficult. In all back-EMF-based sensorless techniques, the low-speed performance is limited, and an open-loop starting strategy is required [1]- [3]. In most other sensorless control strategies, such as flux observers [4], model-reference adaptive control [5], [6], extended Kalman filters [7], and adaptive sliding observers [8] voltages often have to be measured and A/D converters are required.…”

Section: Sensorless Flux-weakening Control Of Permanent-magnet Brushlmentioning

confidence: 99%

“…9. Clearly, when is 30 or the current waveforms are almost continuous, the zero crossing of the back EMF in a nonenergized phase is not discernable in the terminal voltage [16], and conventional sensorless operation based on detection of the zero crossings of the phase back-EMF waveforms [1], [2] is not possible. However, the proposed third harmonic back-EMF sensorless method results in high accuracy, as can be seen by comparing the measured and estimated rotor positions, and observing the estimated rotor position error.…”

Section: A Flux-weakening In Bldc Modementioning

confidence: 99%

“…It caters for phase currents which flow continuously, when the zero crossings of the phase back-EMF waveforms are not detectable. However, as with all EMF-based sensorless methods, an open-loop starting procedure still has to be employed [1]- [3].…”

Section: C Onclusionmentioning

confidence: 99%

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Sensorless flux-weakening control of permanent magnet brushless machines using third-harmonic back-EMF

Shen

Zhu

Howe

IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03.

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Abstract-The sensorless control of brushless machines by detecting the third harmonic back electromotive force is a relatively simple and potentially low-cost technique. However, its application has been reported only for brushless dc motors operating under normal commutation. In this paper, the utility of the method for the sensorless control of both brushless dc and ac motors, including operation in the flux-weakening mode, is demonstrated.Index Terms-Back electromotive force (EMF), brushless drives, permanent-magnet machines, sensorless control.

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Section: Sensorless Flux-weakening Control Of Permanent-magnet Brushlmentioning

confidence: 99%

Section: Sensorless Flux-weakening Control Of Permanent-magnet Brushlmentioning

confidence: 99%

Section: A Flux-weakening In Bldc Modementioning

confidence: 99%

Section: C Onclusionmentioning

confidence: 99%

See 2 more Smart Citations

Sensorless flux-weakening control of permanent magnet brushless machines using third-harmonic back-EMF

Shen

Zhu

Howe

IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03.

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“…The position sensorless control can overcome the problems of the position sensor under practical operating conditions. So the choice of horizontal well traction without position sensor brushless DC motor [1]. This paper is based on the brushless DC motor working in the absence of Hall sensor state, through the back EMF detection to achieve commutation.…”

mentioning

confidence: 99%

A New Strategy for BLDC Sensorless Control System and Its Application in Horizontal Well Tractor

Yu¹,

Chen²

2017

OALib

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The positionless brushless DC motor has the advantages of simple structure, good speed performance and high efficiency. It has become the best choice for horizontal well tractor. This paper introduces a set of brushless DC motor control system, gives the hardware structure of the system and brushless DC motor without Hall sensor control flow chart and the host computer communication interface protocol which solves the problem of phase lag in the case of high speed motor. Aiming at the problem that the parameters of the motor can not be monitored, the host computer monitoring program based on c# can be designed to monitor the parameters of the motor in real time. The experimental results show that the control system can make the motor run smoothly at different speeds, and can monitor the parameters of the motor in real time, suitable for the horizontal well logging and so on the motor control system requires relatively high industrial environment.

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Sensorless rotor position estimation at standstill of cylindrical brushless dc motors using opened phase voltage change caused by eddy currents

et al. 1999

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A rotor position estimation of a cylindrical brushless dc motor at standstill has been difficult to obtain. Therefore, torque control of a motor has been difficult at starting of the motor, and realization of the position estimation at standstill has been sought. This paper proposes a simple processing of a rotor for which nonmagnetic materials are pasted on the rotor surface. This processing generates an eddy current on nonmagnetic materials and causes an opened phase voltage change according to rotor position. The experimental results using a microcomputer show that it is possible to estimate rotor position of the cylindrical motor despite a standstill by using the opened phase voltage change. ©�1998 Scripta Technica, Electr Eng Jpn, 126(1): 52–60, 1999

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Microcomputer Control for Sensorless Brushless Motor

Cited by 382 publications

References 2 publications

Sensorless flux-weakening control of permanent magnet brushless machines using third-harmonic back-EMF

Sensorless flux-weakening control of permanent magnet brushless machines using third-harmonic back-EMF

A New Strategy for BLDC Sensorless Control System and Its Application in Horizontal Well Tractor

Sensorless rotor position estimation at standstill of cylindrical brushless dc motors using opened phase voltage change caused by eddy currents

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