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Types of Motor Mounts

Rigid base is bolted, welded, or cast on main frame and

allows motor to be rigidly mounted on equipment.

Resilient base has isolation or resilient rings between motor

mounting hubs and base to absorb vibrations and noise. A

conductor is imbedded in the ring to complete the circuit for

grounding purposes.

NEMA C face mount is a machined face with a pilot on the

shaft end which allows direct mounting with the pump or

other direct coupled equipment. Bolts pass through mounted

part to threaded hole in the motor face.

NEMA D flange mount is a machined flange with rabbet for

mountings. Bolts pass through motor flange to a threaded

hole in the mounted part. NEMA C face motors are by far the

most popular and most readily available. NEMA D flange kits

are stocked by some manufacturers, including LEESON.

Type M or N mount has special flange for direct attachment

to fuel atomizing pump on an oil burner. In recent years, this

type of mounting has become widely used on auger drives in

poultry feeders.

Extended through-bolt motors have bolts protruding from

the front or rear of the motor by which it is mounted. This is

usually used on small direct drive fans or blowers.