PURPOSE:To strengthen the holding force of a linear pulse motor thereby to improve vibration and impact resistances by burying a permanent magnet between pole teeth of the side having the magnet. CONSTITUTION:A flat platelike linear pulse motor is composed of a square- sectional rodlike permanent magnet 2 disposed at the center, a stator (primary side) 1 having four sets of 4-phase pole teeth gear trains 31a-31d disposed at both sides and a pair of exciting coils 4a, 4b disposed at both sides, a movable element (secondary side) 5 having pole teeth 5a of equal pitch formed on the surface opposed to the trains 31, and a bearing mechanism 6. In this case, the trains 31 have pole teeth 32 displaced at 1/4 equal pitch of phase formed on the upper surface, and permanent magnets 33 buried between the valleys of the teeth for generating magnetic flux in the same direction as the magnet 2. Thus, the magnets 33 generate small and effective bias magnetic flux to strengthen the holding force, thereby improving the vibration resistance.
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