Electricity: motive power systems – Switched reluctance motor commutation control
Reexamination Certificate
2005-07-26
2005-07-26
Ip, Paul (Department: 2837)
Electricity: motive power systems
Switched reluctance motor commutation control
C318S434000, C318S599000, C318S437000
Reexamination Certificate
active
06922029
ABSTRACT:
In a DC motor driven by sinewave power-on driving and having hall elements shift-mounted relative to a stator for detecting the position of a rotor, a reduction in starting torque is eliminated by avoiding a braking action occurring when switching phases on starting the motor. In the case of the sinewave power-on driving, the braking action may occur owing to delay of the current flowing through the windings of the motor by the influence of an inductance value of stator windings and induced voltage of the motor. In order to avoid the braking action, hall elements for detecting the position of the rotor are shift-mounted. However, the braking action would be likely to occur on the contrary, because the induced voltage is low when the motor is started. To solve this problem, according to the invention the 120 ° rectangular wave power-on driving is executed for starting the motor until the number of revolutions of the motor has attained a predetermined value after starting, thereby reducing the undesirable braking action.
REFERENCES:
patent: 3999108 (1976-12-01), Tanikoshi
patent: 4386305 (1983-05-01), Kohzai et al.
patent: 4804892 (1989-02-01), Muller
patent: 5162709 (1992-11-01), Ohi
patent: 5173645 (1992-12-01), Naito
patent: 5847521 (1998-12-01), Morikawa et al.
patent: 6054820 (2000-04-01), Toyoizumi
patent: 6072288 (2000-06-01), Izumisawa et al.
patent: 6154002 (2000-11-01), Izumisawa et al.
patent: 6512343 (2003-01-01), Yasohara
patent: 6534948 (2003-03-01), Ohura et al.
patent: 6812667 (2004-11-01), Yasohara et al.
patent: 6828752 (2004-12-01), Nakatsugawa et al.
patent: 2004/0007998 (2004-01-01), Yasohara et al.
patent: 2004/0056632 (2004-03-01), Nakatsugawa et al.
LandOfFree
DC motor driver does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with DC motor driver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DC motor driver will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3379195