Speed detection apparatus having magnetic rotor with two magneti

Details Speed detection apparatus having magnetic rotor with two magneti Speed detection apparatus having magnetic rotor with two magneti

1991-02-07

1992-07-14

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324175, 32420722, 32420725, G01P 336, G01B 714

Patent

active

051306492

ABSTRACT:
A speed detection apparatus has a rotor magnet (11, 12, 13) having a plurality of magnetic coil portions formed in the direction of its circumference, and a coil pattern for signal detection (6, 7) rotationally displaced relative to an opposing rotor magnet. The rotor magnet has a first magnetized portion (5) for detection of a rotation phase of the rotor and formed in the one portion at a specific position and a second magnetized portion (8) for detection of a rotation speed of the rotor and provided at a portion other than the first magnetized portion and a non-magnetized portion (14) having a crescent shape and provided at a specific position of the rotor symmetrical from a center of rotation of the rotor magnet, with respect to the first magnetized portion.

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