Product Manual

Bearings:
Sleeve: Common in home-appliance motors.
Ball: Used when high shaft load capacity is required. Ball bearings
are usually used in industrial and agricultural motors.
Roller: Use on output shafts of heavy-duty gear reducers and on
some high-horsepower motors for maximum overhung and
thrust load capacities.
Breakdown Torque: The maximum torque a motor can achieve with
rated voltage applied at rated frequency, without a sudden drop in
speed or stalling.
Brush: Current-conducting material in a DC motor, usually graphite, or
a combination of graphite and other materials. The brush rides on the
commutator of a motor and forms an electrical connection between the
armature and the power source.
Canadian Standards Association (CSA): The agency that sets safety
standards for motors and other electrical equipment used in Canada.
Capacitance: As the measure of electrical storage potential of a
capacitor, the unit of capacitance is the farad, but typical values are
expressed in microfarads.
Capacitor: A device that stores electrical energy. Used on single-phase
motors, a capacitor can provide a starting “boost” or allow lower cur-
rent during operation.
Center Distance: A basic measurement or size reference for worm gear
reducers, measured from the centerline of the worm to the centerline
of the worm wheel.
Centrifugal Starting Switch: A mechanism that disconnects the starting
circuit of a motor when the rotor reaches approximately 75% of operat-
ing speed.
Cogging: Non-uniform or erratic rotation of a direct current motor. It
usually occurs at low speeds and may be a function of the adjustable
speed control or of the motor design.
Commutator: The part of a DC motor armature that causes the electrical
current to be switched to various armature windings. Properly sequenced
switching creates the motor torque. The commutator also provides the
means to transmit electrical current to the moving armature through
brushes that ride on the commutator.
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