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9 days ago · SRI RAJARAJESWARI PEETAM Sri Vidya Temple Society 6980 East River Rd,. Download Hungama Music app to get access to unlimited free songs, free movies, latest music videos, kids .The invention concerns a method of and a device for positioning a rotor of a motor, especially of a brushless DC motor, to a desired position. The rotor has a permanent magnet and at least one sensor for detecting the magnetic poles of the permanent magnet.
A device for positioning a rotor of a motor is already known from U.S. Pat. No. 4,522,429. This device is mainly a part of a Hall motor. The Hall motor contains permanent magnets, a carrier plate and coils, whereby the permanent magnets are arranged on the carrier plate. In the rotor, sensors are attached to the carrier plate. A Hall sensor is located in each of the sensors. Each of the Hall sensors detects a magnetic pole, whereby the Hall sensor of each pole is associated with a pole of the permanent magnet. The rotor position is detected by a control unit, whereby, for each magnetic pole of the rotor, the signals from the Hall sensors are fed to the control unit. The control unit determines the position of the rotor by comparing the outputs of the Hall sensors, and the rotor is positioned accordingly.
The device and method according to the invention have the advantage that the number of sensors can be reduced. By applying the method, a Hall sensor is no longer needed to detect a pole of a permanent magnet, but a sensor is only needed for one pole to be detected. By reducing the number of sensors, the production costs are reduced and the output signal from the sensors is more accurate.Lars Væth
Lars Vilhelm Væth (born 2 February 1962 in Viborg) is a Danish former professional cyclist. He was a professional rider from 1980 to 1989. In 1992, he was the first to use the new-fangled carbon-fibre bike and time trial frame made of carbon-fibre tubes, which he used on his way to winning stage 13 of the 1992 Tour de France.
Væth was a powerful rider who achieved his best results in the final kilometre of a long time trial. After a long battle in the Tour de France, he finally achieved his dream of winning one of the most prestigious races in the world in 1992, though the stage was won by Ajoy Kumar by only 11 seconds 0b46394aab