Improvements in velocity-regulating apparatus in direct current motors

摘要

Improvements in velocity-regulating apparatus in direct current motors. They consist in the incorporation of means of detecting phase failure based on amplifiers A4a with relays and a warning LED LD3; means of detecting excitation failure based on amplifier A2 with relays and a LED LD4; means connectable to a temperature-detecting apparatus and consisting of an integrated base circuit CI16.4 and 6 and LED LD6; and means of detection of rotor failure based on amplifier A4b which compares voltages and establishes a threshold in integrated circuit CI5.3 producing the connection of a relay K2 and LED LD2. There is also provided the incorporation of fuses in the supply transformers direction, ultrarapid fuses at the input of the three phases and the positive output of direct current and some overvoltage varistors separate from the respective thyristors. <IMAGE>