| 摘要 |
There is suggested a simple, cost-effective and secure method for the protection of an electrical motor against thermal overload. For this purpose, a motor equation combining at least one temperature dependent motor parameter and at least one motor characteristic quantity is defined in connection with a motor model for the electrical motor. The presently existing values of the at least one motor characteristic quantity are determined in at least two successive measuring times of a measuring process. The value of the at least one temperature dependent motor parameter is determined in connection with the motor equations for the measuring times of a measuring process. The absolute value of the temperature of the electrical motor is determined in connection with motor equations derived in the measuring times of a measuring process while taking into account the functional relationship between the at least one temperature dependent motor parameter and the temperature. If the determined absolute value of the temperature of the electrical motor reaches a prescribed limit temperature, defined measures are taken for the current flow through the electrical motor. Method for the protection of an electrical motor in an electrical drive unit for window lift drives.
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