| 摘要 |
In a non-commutating-pole commutator motor, in particular as the drive of a power hand tool, a device for reversing the direction of rotation which includes a switch (8) for reversing the direction of current in the rotor winding, wherein the brush apparatus (4) is mounted immovably in the motor casing. The rotation of the plane defined by the commutating coils is chosen in such a manner that good commutation is assured in one of the two directions of rotation at full motor output. Furthermore, the switch (8) for reversing the direction of rotation yields the preferred direction of rotation in a first switch position and the opposite direction and makes effective in the switch position for the preferred direction a smaller number of turns of the field winding (1, 2) in the electric circuit of the motor than in the opposite direction of rotation of the motor.
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