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

Claim 12:
13. A method for monitoring the temperature of a motor (M) with an electromechanically drivable motor shaft using a differential equation system (DGL) which simulates 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 with 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;
wherein the differential equation system (DGL), as a modular system, enables several alternative solution methods for determining the temperature, by means of numerical integration, by means of an analog calculation method based on an analog computer, or by means of an analog calculation method by means of a model comprising passive components.