Patent ID: 8191399

Claim:
A monitoring device for a drive device, wherein the monitoring device is provided for monitoring a movement of the drive device, comprising: a first sensor, wherein the first sensor is mechanically coupled to a motor shaft of a drive device via a coupling, wherein the coupling has a driving side and a driven side, and wherein the first sensor is assigned to the driven side of the coupling; and a second sensor, wherein the first sensor is monitored based upon the second sensor, and wherein the second sensor is assigned to the driving side of the coupling, wherein both sensors detect movements of the drive device, wherein a rotational movement of the driven side of the coupling is registered by the first sensor and wherein a rotational movement of the driving side of the coupling is registered by the second sensor, wherein the second sensor has a data link to the first sensor, wherein a sensor signal of the first sensor is evaluated with reference to a sensor signal of the second sensor in a signal processing device, and wherein the signal processing device is connected to a control device in order to transmit a fault signal to the control device when a differential of the sensor signals of the first and second sensors exceeds a threshold.