| 摘要 |
<p>The first of the motors (M1) is a motor with four brushes, the first brush (B11) being permanently connected to the first polarity and the second, third, and fourth brushes (B12, B13, B14) being capable of being connected to the appropriate polarities of the source respectively by means of three switches (K1, K2, K3) or, as a variant, by two switches (K1, K3), and the second motor (M2) has two brushes, one (B21) of which is permanently connected to the first polarity and the other (B22) to the fourth brush (B14) of the first motor (M1). Depending on the states of the various switches, various operating speeds of the motors are obtained, ranging from the latter simultaneously being at rest, up to a nominal rotational speed for the two motors, passing through intermediate speeds including a low speed for at least one of the motors. <IMAGE></p> |
