- المجال: Electrical equipment
- Number of terms: 4774
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A device which converts electrical power (alternating current) to electrical power of a different voltage. In this device both primary and secondary windings are usually stationary, and are wound on a common magnetic core.
Industry:Electrical equipment
Special bearings used to handle higher than normal axial forces exerted on the shaft of the motor as is the case with some fan or pump blade mountings.
Industry:Electrical equipment
A motor in which heat is dissipated by air-to-air heat exchange.
Industry:Electrical equipment
Vacuum degassing is a process used in the purifying of steel for ball bearings assuring a very dense and consistent bearing surface. This results in a longer lasting superior bearing. All Reliance ball bearings are vacuum degassed bearings.
Industry:Electrical equipment
A multi-speed motor used on loads whose torque requirements vary with speed as in some centrifugal pumps and blowers. The HP varies as the square of the speed.
Industry:Electrical equipment
A motor being mounted vertically (shaft up or down) as in many pump applications.
Industry:Electrical equipment
The force that causes a current to flow in an electrical circuit. Analogous to pressure in hydraulics, voltage is often referred to as electrical pressure. The voltage of a motor is usually determined by the supply to which it is being attached. NEMA requires that the motor be able to carry their rated horsepower at nameplate voltage plus or minus 10% although not necessarily at the rated temperature rise.
Industry:Electrical equipment
Loss encountered across a circuit impedance from power source to applicable point (motor) caused by the resistance in conductor. Voltage drop across a resistor takes the form of heat released into the air at the point of resistance.
Industry:Electrical equipment
The moment of inertia is expressed as Wk2or WR2in terms of pound-feet squared. It is the product of the weight of the object in pounds and the square of the radius of gyration in feet.
If the application is such that the motor is driving through a pulley or gear so that the driven equipment is operating at a higher or lower speed than the motor, it is necessary to calculate the inertia "reflected to the motor shaft," that is, an equivalent Wk2(reflected to motor shaft) = Wk2 based on the rpm of the motor.
Industry:Electrical equipment
The amount of power required to maintain a current of one ampere at a pressure of one volt. Most motors are rated in Kwatt equal to 1,000 watts. One horsepower is equal to 746 watts.
Industry:Electrical equipment
