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HEAT EXCHANGER A device which will transfer the heat from inside the motor to
another medium, through a radiator type heat exchanger.
HERTZ (HZ) One cycle per second (as in 60 Hz. which is 60 cycles per second).
HORSEPOWER The measure of rate of work. One horsepower is equivalent to
lifting 33,000 pounds to a height of one foot in one minute. The horsepower
of a motor is expressed as a function of torque and rpm. For motors the
following approximate formula may be used:
where HP = horsepower, T = torque (in. lb.ft.), and RPM = revolutions
per minute.
HYSTERESIS LOSS The resistance offered by materials to becoming magnetized (magnetic
orientation of molecular structure) results in energy being expended and
corresponding loss. Hysteresis loss in a magnetic circuit is the energy
expended to magnetize and demagnetize the core.
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