General purpose motors are open induction motors are where the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor can therefore be made without electrical connections to the rotor.
Some industries determine a “horsepower breakpoint” that is used to establish and simplify their motor replacement policies. Motors larger than the breakpoint horsepower rating are typically repaired and returned to service when they fail; motors smaller than the breakpoint horsepower rating are recycled and replaced with a new premium efficiency motor. Motors with 25 hp and below should always be replaced when they need to be rewound.
NEMA Design B motors deliver a starting torque that is 150% of full load or rated torque and run with a slip of no more than 3% to 5% at rated load.
For replacing these motors, you will need to keep complete and detailed service records as well as the original winding pattern for the service center.
We carry high performance T Frame motors, from 1HP and up to 250HP. Contact us for more information.