Supports: cabinet structure – Knockdown or setup type – Foldable
Patent
1991-08-27
1993-04-27
Wysocki, Jonathan
Supports: cabinet structure
Knockdown or setup type
Foldable
318439, H02P 700
Patent
active
052065677
ABSTRACT:
When a sensorless and brushless DC motor is started, the rotor having a magnet is positioned by first exciting one pair of motor coils and then exciting another pair motor coils. The excitation of the motor coils is repeated until the rotor stops vibrating. Further, the positions of the magnetic poles of the rotor are detected by comparing the back electromotive force produced in each motor coil with the voltage generated in common to all motor coils. The rotation speed of the rotor is acquired from both the positions of the magnetic poles and the one cycle period of a signal representing the position of the rotor. A suitable delay time corresponding to the acquired rotation speed is determined, and the excitation phases are switched in accordance with the suitable delay time.
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patent: 4814676 (1989-03-01), Van Hoat
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patent: 4896089 (1990-01-01), Kliman et al.
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patent: 4988939 (1991-01-01), Reichard et al.
Kaida Katsuhiko
Masaki Hideo
Sakurai Tetsuji
Kabushiki Kaisha Toshiba
Wysocki Jonathan
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