Thermally Protected Motor Wiring

For understanding motor thermal overload protection in induction motor we can discuss the operating principle of three phase induction motor.

Thermally protected motor wiring.

The degree of protection that an internal protection device provides is classified in the iec 60034 11 standard. Pacemaker danger magnetic and electromagnetic fields in the vicinity of current carrying carrying conductors and permanent magnet motors can result result in a serious health hazard to persons with cardiac pacemakers metal implants and hearing aids. This safety feature halts the temperature climb before it can burn up the motor. Thermistor is a small non linear resistance sensors which can be embedded within the insulation of a motor winding to provide a close thermal association with the winding it s made from a metal oxide or semiconductor material.

This series offers several different horsepower options as well as thermal protection. Different types of thermal protection exist and are identified by a tp code tpxxx which indicates. An 84 efficient motor with a total watt draw of 400w produces 336 watts of useful energy 400 x 84 336w. On a 12 wire motor wired for high voltage i e 480v 10t 11t and 12t must be connected together but not connected to anything else.

Tp is the abbreviation for thermal protection. The thermal protection is present to turn the motor off when excessive heat is generated within the motor circuitry. Electric motor thermal overload switch location. The 5kh series comes with permanently lubricated bearings.

Single phase wiring diagrams always use wiring diagram supplied on motor nameplate for motors without thermal protection single voltage single rotation single voltage reversible rotation dual voltage single rotation split phase motor. Due to such symmetrical distribution when three phase power supply. The ge marathon electric 5kh series thermally protected ac motors come in a variety of shapes and sizes. The other 9 wires would be connected as in a 9 wire motor note in a 9 wire motor the equivalent of t10 t11 and t12 are internally connected together.

Thermal protection thermal protection overload. Electric motor thermal overload switch location. There is one cylindrical stator and a three phase winding is symmetrically distributed in the inner periphery of the stator. The 64 watts lost 400 336 64w becomes heat.

L1 to t1 l2 to t2 l3 to t3 t4 to t7 t5 to t8 and t6. Motors are to be returned to a hazardous and or explosive atmosphere. The type of thermal overload for which the thermal protection is designed 1 digit.