Adjustable Speed Drive with a Brushless DC Motor

The brushless dc motor described consists of a synchronous motor with a rotor position sensor and a three-phase bridge inverter. The commutation in the inverter circuit is performed by the induced voltage of the armature windings. In this situation, since auxiliary commutation devices such as capaci...

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Bibliographic Details
Published inIEEE transactions on industry and general applications Vol. IGA-7; no. 4; pp. 539 - 543
Main Authors Sato, Noriaki, Semenov, Vsevolod V.
Format Journal Article
LanguageEnglish
Published IEEE 01.07.1971
Subjects
Brushless DC motors
Circuits
Commutation
Inductors
Inverters
Rotors
Sensor phenomena and characterization
Synchronous motors
Thyristors
Variable speed drives
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ISSN0018-943X
DOI10.1109/TIGA.1971.4181338

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Summary:The brushless dc motor described consists of a synchronous motor with a rotor position sensor and a three-phase bridge inverter. The commutation in the inverter circuit is performed by the induced voltage of the armature windings. In this situation, since auxiliary commutation devices such as capacitors, inductors, and auxiliary thyristors are not required, the simplest inverter circuit is obtained. However, the commutation ability decreases at low speed and starting difficulty results. A novel starting procedure is described whereby the chopping of the rectifier output voltage is accomplished by control of the delay angle. In order to obtain a rapid interruption of the main circuit current, an auxiliary thyristor antiparalleled to the smoothing reactor is used. Finally, a new method of speed sensing that eliminates the need of a tachogenerator is proposed. Speed stabilization with an accuracy about 5 percent in a speed range of 10:1 is perforned with this new control system.
ISSN:0018-943X
DOI:10.1109/TIGA.1971.4181338