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Przystosowanie silników klatkowych do pracy w warunkach długo trwających lub często powtarzanych rozruchów

Bernatt M.

Maszyny Elektryczne : zeszyty problemowe

2012

Nr 1(94)

149-151

Induction squirrel cage motors used in many industrial drives, even of high capacity, are started by switching direct on line. Starting current, several times higher than nominal load current, causes thermal and mechanical, dynamic stresses dangerous for motor's structure. Both, stator and rotor windings are endangered at starting period, but stresses in rotor cages are usually higher, therefore proper rotor design (and its manufacturing process) is of high importance for motor's durability. Examples given in the paper show, that even standard motor with new, special, redesigned rotor can withstand as many as 70.00 long lasting starts, executed by switching the motor direct on line.