- 産業: Electrical equipment
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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
Type II (WPII) shall have, in addition to the enclosure defined for a Type 1 weather-protected machine, its ventilating passages at both intake and discharge so arranged that high velocity air and airborne particles blown into the machine by storms or high winds can be discharged without entering the internal ventilating passages leading directly to the electric parts of the machine itself. The normal path of the ventilating air which enters the electric parts of the machines shall be so arranged by baffling or separate housing as to provide at least three abrupt changes in direction, none of which shall be less than 90f . In addition, an area of low velocity not exceeding 600 feet per minute shall be provided in the intake air path to minimise the possibility of moisture or dirt being carried into the electric parts of the machine.
Industry:Electrical equipment
A wound rotor induction motor is an induction motor in which the secondary circuit consists of polyphase winding or coils whose terminals are either short circuited or closed through suitable circuits. A wound rotor motor is sometimes used when high breakdown torque and a soft start or variable speed are required.
Industry:Electrical equipment
A method of starting a motor at rated voltage but drawing locked rotor current and producing reduced stocked rotor torque but it provides lower starting torque than a straight delta connection. Once the load and motor have been started the wiring will switch from the wye connexion to a delta connexion in which mode it must run and deliver full torque.
Industry:Electrical equipment
A piece of current conducting material (usually carbon or graphite) which rides directly on the commutator of a commutated motor and conducts current from the power supply to the armature windings.
Industry:Electrical equipment
A type of flange used with close coupled pumps, speed reducers, and similar applications where the mounting holes in the f flange are threaded to receive bolts. Normally the "C" Flange is used where a pump or similar item is to be overhung on the motor. The "C" type flange is a NEMA standard design and available with or without feet.
Industry:Electrical equipment
A designation for variable or adjustable speed motors used for loads requiring the same amount of H.P. regardless of their motor speed during normal operation.
Industry:Electrical equipment
NEMA has standard NEMA motor designs of various torque characteristics to meet the various requirements posed by different application loads. The design "B" is the most common design.
Industry:Electrical equipment
Losses due to current flowing in a conductor caused by resistance (equals the current squared times the resistance.
Industry:Electrical equipment
J is the per unit moment of inertia. It is defined as the time in seconds to accelerate the motor armature to rated base speed using rated full load torque.
Industry:Electrical equipment
