Device and method for detecting the coil temperature of a direct-current motor, especially a brushless direct-current motor
AssigneeHeidelberger Druckmaschinen AG
InventorsBertold Grutzmacher, Peter Eiswirth, Helmut Meyer
Life of this patent
Estimating the term…
Abstract
A device and method for detecting the coil temperature of a direct-current motor by determining the resistance of at least one coil of the motor. The method includes measuring a parameter of the at least one coil while the motor is running. The measurement is made at a time interval in which the coil is without current. The measuring device includes a commutation circuit of the motor which generates a time interval used for measuring the current.
Claims12
Device for detecting the coil temperature of a direct-current motor by determining the resistance of at least one coil of the motor, comprising means for measuring a parameter of the at least one coil while the motor is running and during a time interval in which the coil is without current.
Device for detecting the coil temperature of a direct-current motor by determining the resistance of at least one coil of the motor, comprising means for measuring a parameter of the at least one coil while the motor is running and during a time interval in which the coil is without current, and wherein said measuring means comprise a commutation circuit of the motor having means for generating a signal determining the length of said time interval.
Device for detecting the coil temperature of a direct-current motor by determining the resistance of at least one coil of the motor, comprising means for measuring a parameter of the at least one coil while the motor is running and during a time interval in which the coil is without current, and a pulse generator connected to said one coil for applying at least one voltage pulse to said coil, and means for determining the intensity of a resultant current flow as a measure of the resistance of said coil.
Method of detecting the coil temperature of a direct-current motor by determining the resistance of at least one coil of the motor, which comprises measuring a parameter of the one coil while the motor is running and during a time interval in which the coil is without current.
Method of detecting the coil temperature of a direct-current motor by determining the resistance of at least one coil of the motor, which comprises measuring a parameter of the one coil while the motor is running and during a time interval in which the coil is without current, and generating a signal determining the length of the time interval.
Method of detecting the coil temperature of a direct current motor by determining the resistance of at least one coil of the motor, which comprises measuring a parameter of the one coil while the motor is running and during a time interval in which the coil is without current, exciting a resonant frequency in the resonance circuit at which a resultant current in the resonance circuit has a maximum amplitude and represents a measure of the resistance of the coil, and scanning a frequency range including the resonant frequency during the time interval.
Dependencies are inferred from the claim text.