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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.