Speed detector for sewing machines

Details Speed detector for sewing machines Speed detector for sewing machines

D - Textiles, Paper

05

B

73/68, 310/73, 3

D05B 69/20 (2006.01) D05B 69/24 (2006.01) G01P 3/488 (2006.01) H02K 21/38 (2006.01)

Patent

CA 1171497

ABSTRACT OF THE DISCLOSURE: A speed detector for a sewing machine comprising a rotor rotatable with a drive shaft of the sewing machine, and a stator. The rotor and the stator are formed of a ferromagnetic material and each have a multitude of teeth which face in opposition to the teeth of the other forming a gap therebetween. A first permanent magnet forms a first magnetic circuit with the rotor and stator, and a first coil is disposed in the first magnetic circuit to generate a first voltage at a frequency proportional to the rotational speed of the rotary shaft. A second permanent magnet is magnetized in opposite direction to the direction of magnetization of the first magnet to form a second magnetic circuit with the stator and rotor, the second magnetic circuit, and a second coil disposed in said second magnetic. circuit to develop a second voltage at the same frequency as the first voltage. The first and second coils are connected in series so that the first and second voltages are construc- tively added.

382843

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