| 摘要 |
The aim of the invention is to monitor a stationary condition of a drive device (1). For this purpose, a monitoring device (18) provides the drive device (1) with a temporally varying monitoring signal (A to D) which, when a sensor device (4) connected to the drive device (1) functions properly, modulates a sensor output signal (s) of the sensor device (4) in accordance with the monitoring input signal (A to D). The monitoring device (18) receives the sensor signal (s) and monitors it for the presence of a corresponding signal component. In the absence of such a signal component, the monitoring device (18) controls a safety device (17) which converts the drive device (1) into a safe state. When the drive device (1) is controlled by means of at least two phase-shifted current regulators (15a, 15b), it is possible for the monitoring device (18') to monitor an output signal of at least one of the current regulators (15a, 15b) for constancy and to control the safety device (17) when the output signal of the at least one current regulator (15a, 15b) changes. |
