| 摘要 |
A system, which may be a cooling system for a motor vehicle engine, has two direct current motors together with switching circuits which provide selective connection of the windings of the two motors to a direct current voltage source in such a way as to obtain different operating modes for each motor. One of the motors has four brushes, the first of which is permanently connected to the first polarity of the source, while its second, third and fourth brushes are arranged so that they can be connected to the appropriate source polarities respectively through either three interruptors or two. The second motor has two brushes permanently connected, respectively, to the same first source polarity and to the third or fourth brush of the first motor. According to the settings of the various interruptors, different operating modes for the motors are obtained, going from the mode in which both motors are stopped to one in which they are both running at their nominal speeds, through intermediate modes in which the speed of at least one of the motors is reduced.
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