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. … Permanent-magnet stepper motors are the simplest. Manufacturers define their pole count by the number of pole pairs or stator windings.
What is difference between 2 pole and 4 pole motor?
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.
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 a 6 pole motor?
On an induction motor, the number of poles determines the speed given the frequency of the power. For a 2 pole motor, at 60hz, it will spin 60 times a second, or 3600rpm. For a 4 pole motor, the speed is halved – 1800 rpm, 6 pole, 1200 rpm and so on. … Synchronous speed = 3000, 1500, 1000, 750.
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 is the rpm of a 4 pole motor?
around 1800 rpm
How many RPM is a 8 pole motor?
Which motor is more efficient?
AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.
What is 120 in motor speed formula?
The equation for calculating synchronous speed is: S = 120 f/P speed = constant (120) times frequency of power source (60 Hz) divided by number of poles used in the motor (P). Where does the 120 come from and what units does it have? There is RPM on one side and Cycles/second divided by #of poles on the other.
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 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.
How do you determine brushless motor pole count?
The largest characteristic that a motor with more poles displays when all else is equal is a drop in the KV value. The KV value as we all know is the amount of RPM per volt. When all else is equal between 2 brushless motors, the one containing a higher pole count will have a lower KV value.
How much can you overspeed a motor with a VFD?
With the use of Variable Frequency Drives (VFD), motors can be run at higher than 60 Hz, known as an overspeed condition, typically as direct drive fan wall/plenum fans (per NIH DRM 6.2. 4.2, the maximum operating speed is 90 Hz).
What is the rpm of 1 hp motor?