AUTOMATIC WINDING TEMPERATURE CONTROL DEVICE FOR DIRECT-CURRENT MACHINES Russian patent published in 2001 - IPC

FIELD: electromechanical engineering; temperature control and overtemperature protection of electrical machines. SUBSTANCE: newly introduced in electrical- machine computing unit are following components: unit incorporating mathematical model of electrical machine as thermal object; signals taken off outputs of electrical-machine current and voltage sensors, machine shaft and fan shaft speed sensors, coolant temperature sensor, and also action correcting computation process of maximal local temperatures of armature winding, main- and commutating-pole windings are applied to inputs of this unit; correction unit wherein calculated and measured values of average temperature of main- and commutating-pole windings are compared; its input is supplied with calculated values of average temperature of main- and commutating-pole windings picked off output of mathematical model unit and measured values of average temperature of these windings, off output of measuring unit; action correcting computation process of maximal local temperatures of armature winding, main- and commutating-pole windings is fed from output of correction unit to input of mathematical model unit; comparison unit wherein calculated values of maximal local temperatures of armature winding, main- and commutating-pole windings are compared with desired temperatures and error signals are generated to indicate difference between calculated and desired values of maximal local temperatures of armature winding, main- and commutating-pole windings; calculated and desired values of maximal local temperature of armature winding, main- and commutator-pole windings, and also desired values of maximal local temperature of armature winding, main- and commutating-pole windings are supplied to comparison-unit inputs from mathematical model unit; control-action signal shaping unit with control action being supplied from this unit to input of controlled fan drive in electrical-machine cooling system. Error signals coming from output of comparison unit, signal indicating device change-over to emergency condition that arrives from correction unit, and also signals picked off outputs of electrical-machine power computing unit and electrical-machine current and coolant temperature sensors are applied to shaping-unit inputs. EFFECT: provision for maintaining maximal temperatures of electrical-machine windings within desired limits. 2 dwg