| 摘要 |
A battery operated lightweight display device comprises a housing (22) containing an electrically operable stepper motor (1), the stepper motor including a magnetic rotor (6), the rotor having single or multiple magnetic pole pairs, a bi-polarisable stator (3) and associated coil (8); a drive circuit (2) for driving the stepper motor at high speed by means of discrete electric drive pulses; a gear train (18,19,20 and 21) drivingly connected between the rotor and a rotatable display support element (16); the display support element being adapted to support an object to be displayed (24) and rotated relative to said housing when the drive circuit and hence the stepper motor is energized by a battery.
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