Patent ID: 7905138

Claim:
A method for checking the transmission backlash in an arrangement, in which a motor moves a load via a transmission, a transducer being arranged on a drive element of the motor, comprising: applying a first test control signal, which includes two periodic signals with two defined frequencies, to the motor in a base state of the arrangement; measuring by the transducer a first measurement value in response to the first test control signal; determining a first ratio of the amplitudes for the two defined frequencies from the first measurement value; applying a second test control signal to the motor at a test time after applying the first test control signal; measuring by the transducer a second measurement value in response to the second test control signal; determining a second ratio of the amplitudes for the two defined frequencies from the second measurement value; comparing the first ratio and second ratio of the amplitudes with one another or with a threshold value; and determining, on the basis of a predefined criterion, of whether the transmission backlash at the test time deviates from the transmission backlash in the base state to such an extent that maintenance of the transmission is required.