The motor drive energizes stator teeth one after the other to make the rotor turn, thanks to its magnets’ tendency to force alignment with the stator teeth. Simply defined, a pole is a north or south magnetic field of force that is generated by a permanent magnet or current passing through a coil of wire.
What is number of pole in motor?
The number of pole pairs (p) or number of poles for an asynchronous motor determines the motor’s synchronous speed: Two-pole and four-pole asynchronous motors are typically used for centrifugal pumps. The rotational speed of these motors can be varied using frequency inverters.
How do you find the pole of a motor?
To determine the number of poles, you can read the data plate directly or calculate it from the RPM stated on the data plate or you can count the coils and divide by 3 (poles per phase) or by 6 (pairs of poles per phase).
What is the difference between 2 pole and 4 pole electric motors?
A 4-pole motor is within 4 magnetic poles on the rotor and the number of related electro-magnetic windings (circuits). A 4-pole motor has about 3.0 ft-lbs of torque per horsepower whereas a 2 pole motor has 1.5 ft-lbs of torque. At 60Hz, a 4-pole motor is about 1800 rpm where a 2-pole motor is 3600 rpm.
How many RPM is a 4 pole motor?
What RPM is an 8 pole motor?
Approximate Electrical Motor Speed (rpm)No. PolesSpeed with Rated LoadSynchronous Speed (no Load)4172518006114012008850900Ещё 2 строки
How many RPM is a 6 pole motor?
What does 4 Pole mean in electrical terms?
It basically means that an electrical machine (motor or generator) has four magnetic poles as shown in this cross section:  There are four magnetic poles on the rotor (the inner part that turns with the shaft): two north poles and two south poles.
What is a 3 pole motor?
The magnetic fields in a three pole DC motor are generated by three electromagnets and two permanent magnets, as shown on the right. A section of the motor, called the commutator, connects the brushes to the coils and allows for current to flow from the power source, through the coils and back to the power source.
What is the difference between a 4 pole and 6 pole motor?
Given all else is equal then the 6 pole will develope more torque but less power than the 4 pole , the magnets must be smaller in the 6 pole so less powerful but as there are more it’s smoother and gives more torque .
What is a 2 pole 3 phase motor?
The windings generate alternating N (north) and S (south) poles. As a result AC motors are 2-pole, 4-pole, 6-pole, etc. … On a three-phase motor the pole pattern has to be repeated for each phase. Therefore a 2=pole, 3-phase motor will have six poles.
What does pole mean?
Definition of pole (Entry 3 of 5) 1 : either extremity of an axis of a sphere and especially of the earth’s axis. 2a : either of two related opposites. b : a point of guidance or attraction.
What does pole mean on brushless motors?
Poles are the magnets in the rotor. 2 pole motor means 2 magnets,4 pole means 4 magnets. Obviously the more magnets the greater the magnetic pull/resistance when the rotor rotates inside the stator.
What is the rpm of 1 hp motor?
How do you determine if a motor is AC or DC?
Look for the stator core construction and rotor. If there is no commutator, then it is a AC motor. If there is a commutator and brushes, it may be either a DC motor or an AC commutator motor (Universal motor).
How do you slow down an AC motor?
If it’s a small fan motor or even a ceiling fan, this is often done by reducing voltage to the motor with a solid state control or a series inductance. This just increases the slip speed. A large AC motor can be slowed down with a Variable Frequency Drive.