| 摘要 |
The invention relates to a stepping-motor control device in which the one end of each pair of field windings (13A, 13A), which are wound on each field pole of a stator and are inductively coupled to one another, is in each case connected to the positive terminal of a power supply (21), and the other ends or connections of the field windings (13A, 13A) are in each case connected via switching elements (22, 23) to the negative terminal of the power supply (21). Diodes (26, 27) are connected in parallel with the switching elements (22, 23) in the reverse or blocking direction with respect to the power supply. In this arrangement, the phase current which is produced by the back e.m.f. which, for its part, is induced on the one field winding (13A) at the instant of separation of the other field winding (13A) from the power supply (21) by means of the switching element (22), is commutated via a loop which comprises the one field winding (13A), the power supply (21) and the diode (27). <IMAGE>
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