| 摘要 |
A stepper motor having a pair of field coils, a pair of permanent magnet rotors carried by a single shaft such that their magnetic polarities are displaced ninety mechanical degrees from each other, and two pairs of stator pole pieces. Each pair of stator pole pieces is associated with a separate rotor and a separate field coil. A stationary permanent magnet is mounted on each pair of stator pole pieces, and the magnet generates a bias flux in opposition to the flux of the field coil associated with that pair of pole pieces. When electrical pulses of pre-determined polarities are applied selectively to the field coils, there is produced a pre-determined angular advance of the rotor shaft.
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