| 摘要 |
A bridge network has three resistance branches, the fourth branch being formed by the armature winding of the motor which, typically, is a series motor. Unbalance of the bridge is sensed and applied over a coupling element, for example an opto-electronic coupler, to a control circuit in series with the motor armature to controllably supply power to the motor, for example by intermittent application of current thereto.
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