| 摘要 |
PURPOSE:To preserve heat at the time of stoppage by using two coils of a motor having different diameters and the same number of windings and switching the power feed at the time of operation and stoppage. CONSTITUTION:The first coils 2a, 3a and the second coils 2b, 3b are provided as coils of a motor 1, and the first coils 2a, 3a and the second coils 2b, 3b have the same number of windings and different diameters. When the operation of the motor 1 is stopped, switches 8 7 are connected to 5b-7b, and the power is fed to the second coils 2b, 3b. Accordingly, heat can be preserved at the time of stoppage while a rotor is not rotated.
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