Patent ID: 11923730
Assignee: EBM-PAPST MULFINGEN GMBH & CO. KG
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for monitoring the temperature of a motor (M) with an electromechanically drivable motor shaft using a differential equation system (DGL) which describes the thermal behavior of the motor (M), the motor (M) being in a system that includes: a sensor based on a thermal model (MOD), which describes thermal behavior of the motor (M); a measuring means for determining electrical input power (P) of the motor (M); and a measuring means for recording shaft speed n of the motor shaft, wherein an evaluation device is also provided, which is configured to determine, respectively, current motor temperature of the motor (M) from the input power (P), a reference temperature TRef, the determined shaft speed n, and the thermal model (MOD);
the method comprising the following steps:
a. recording the electrical input power of the motor;
b. calculating the mechanical shaft power from the recorded speed of the motor (M) and determining the corresponding torque of the motor (M);
c. calculating the thermal power loss that leads to the increase in motor temperature, in particular by subtracting the mechanical shaft power from the electrical input power; and
d. the determined thermal power loss is fed into the differential equation system (DGL) as an input variable for solving the differential equation system (DGL), and a temperature increase is calculated therefrom, in particular using an additional reference temperature Tref, which is added to the temperature increase in order to determine the motor temperature therefrom.