Device for detecting abnormal conditions in a stepping motor

摘要

In a device for detecting an abnormal condition in a stepping motor, a second phase coil is provided which is in the relation of mutual induction with a first phase coil of the stepping motor to be tested for an abnormal condition, and the application and non-application of the supply voltage to the first phase coil under test is compared with the variation of the terminal voltage of the second phase coil, to detect the breaking of the first phase coil.