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GLOSSARY OF
TERMS
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| Ambient – The temperature of the space surrounding the motor.Generally,
motors are designed to operate in a temperature of 40°C
(104°F) or less. |
| Ambient Temperature
– The temperature of the
space surrounding the power transmission equipment during
operation. |
| Automatic Reset
– Thermal protector automatically
reconnects power to motor following cooling period. Do not
use in situation where unexpected restart would be hazardous. |
| Breakdown Torque
– The maximum running torque
of a motor without causing an abrupt reduction in speed
and power. |
| Braking – The mechanical and/or electrical mechanism available to provide
instant stopping or slowing of a motor or gearmotor to prevent
or reduce over-travel. Depending on the type of brake selected
it can also provide a degree of holding torque. |
| Capacitors – It is critical to operation performance and motor life to
specify the correct capacitor with motor selection. Capacitor
ratings to HP ratings will vary with different brands and
applications. Merkle-Korff will recommend the correct capacitor
to meet your requirements. |
| Coupling Load to
Shaft – Consider the form
of coupling with the configuration and machining of the
output shaft. Always specify if a pulley is to be used.
Optimum designs locate the load nearest to the gearcase
output bearing. |
| Custom – DC Motors and Gearmotors customized to applications requiring
a specific torque, speed and shaft configuration. Merkle-Korff also offers a wide
range of “stock” products for consideration. |
| Duty Cycle – The relationship between operating and rest time. |
| Full-Load – The minimal speed an induction motor operates under rated
load output torque. Full load will vary depending upon the
rating and characteristics of the specific motor and will
be less than the synchronous speed. |
| Full-Load Amps –
Amperage drawn by motor operating
at rated output torque and voltage. |
| Hertz – Frequency of AC power in cycles per second. Usually 60 Hz
in USA, 50 Hz overseas. |
| Impedance Protected
– Under locked rotor or stalled
condition, motor is thermally protected via motor winding
impedance to prevent burnout per UL standard No. 519. |
| Motor Types – Classified by operating characteristics and power specified.
For example Shaded Pole, Permanent Split Capacitor, and
DC. |
| Mounting – The mounting position may affect shaft loading and the performance
of the optional motor brakes. The relative position of the
gearmotor to the application will dictate certain design
parameters. (See Basic Specification Form). |
| Output Speed – Speed
as rated in revolutions per minute (rpm) in a full load
condition or a free running condition. Rated frequency of
the associated voltage will affect overall output speed. |
| Overhung
Load – The side or radial
force applied at right angles to a drive motor, gearmotor
or reducer shaft. The bearing and shaft must support this
force while transmitting power. |
| Permanent Split
Capacitor – Low starting
torque (similar to Shaded Pole) with low line current and
high HP capabilities. |
| Radial
Load – Interchangeable
with the term “Overhung Load”. |
| Reversible – Reversing motor for alternating current applications with
low current draw. |
| Rotation – Direction in which shaft rotates…clockwise, counter-clockwise
or reversing. |
| Shaded Pole – An economical motor consisting of steel laminations, a wound
electrical field coil, small copper shading coils and a
rotor body. Merkle-Korff offers both high starting and high
running torque models. |
| Sleeve Bearings
– Important when low noise
is critical. Can be mounted in any position, shaft-up or
shaft-down. |
| Starting Torque
– The maximum torque (turning
ability) produced on start of motor. |
| Stock – Merkle-Korff has standing inventory meeting customer
speed, torque, and shaft specifications. |
| Temperature Rise
– The temperature degrees,
above its surroundings, at which motor is operating. Check
motor nameplate for ambient rating. |
| Thermal Protector
– The automatic shut-off
device, built into the motor, that senses excessive temperature
due to overloading or start failure. |
| Torque – Typically measured in inch-pounds, torque is the twisting
force applied to the output shaft of a motor or gearmotor.
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| Torque Load – The maximum torque produced by a running motor without a sudden
decrease in speed and power. |
| Voltage – The amount of force or pressure pushing an electric current
through a circuit. |
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ABBREVIATIONS: MOTORS AND GEARMOTORS
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