Patent ID: 7671711
Filing Date: 2010-03-02
Classification: H01H,H02K

Abstract:
1. An apparatus comprising: a first permanent magnet type linear pulse motor including a first moving part and a first stationary part; a second permanent magnet type linear pulse motor, arranged opposite to the first permanent magnet type linear pulse motor, including a second moving part and second stationary part; and an actuator member coupled to the first moving part and the second moving part; wherein each of the first permanent magnet type linear pulse motor and the second permanent magnetic type linear pulse motor include a field section including a plurality of permanent magnets arranged in a row such that neighboring magnets have reversed polarity, and a coil section having a three-leg type magnetic yoke and actuation coils wound around legs of the magnetic yoke; and wherein a length A of one permanent magnet and an inter-leg pitch B of the three-leg type magnetic yoke are set to satisfy the relation (3/3×A)≦B≦(5/3×A).