24 Terms
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Motors
Industry: Electrical equipment
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Motors
starting torque
Electrical equipment; Motors
The minimum torque which is developed at rest for all angular positions of the rotor with rated voltage and frequency applied to the motor.
static friction torque (Tf)
Electrical equipment; Motors
A measure of the resistance to angular motion. It is due to bearing friction and cog friction. Cog friction is the magnetic drag between the permanent magnet and rotor laminations in a PM motor. It ...
temperature rise
Electrical equipment; Motors
The increase in temperature in ºC or ºF of the excited winding coil above ambient temperature at locked rotor or any designated load condition. T rise = T (total) - T Amb Hot)
terminal resistance (Rt)
Electrical equipment; Motors
The resistance of a motor as seen by the power supply. It is measured at the motor power leads or terminals.
thermal dissipation factor (thermal resistance) (Rth)
Electrical equipment; Motors
A motor’s ability to dissipate heat. It provides a means of evaluating winding temperature as a function of outside surface temperature under steady state conditions, and is measured in ºC/watt.
thermal time constant (Th)
Electrical equipment; Motors
The time required for a motor to reach 63.2% of its final temperature under known input and load conditions. It is measured in minutes. The value depends on mounting and motor speed.
torque (T)
Electrical equipment; Motors
A property which produced, or tends to produce, rotation. A force of one pound applied to the handle of a crank, the center of which is displaced one foot from the center of the shaft produces a ...
