Table of Contents
What is the pole of a motor?
The pole count of a motor is the number of permanent magnetic poles, north and south, on the rotor. There is always the same number of north and south poles on the rotor. For example, in a 12 pole motor, there are 6 north poles and 6 south poles. This motor would also be considered a 6 pole-pair motor.
Why do some motors have more poles?
Motor Wiring and Number of Poles A permanent magnet has two poles, but motors can be wired so their magnetic field has a higher number of poles. A two-pole motor completes a full revolution with one polarity change, while a four-pole motor only rotates 180° with one polarity switch.
Does more Poles mean more torque?
Increasing the pole count can increase the torque capacity, under certain conditions. This happens thanks to the reduced flux per pole, allowing a thinner stator (or rotor) yoke. This can in turn translate to a larger airgap radius or/and deeper slots, both of which lead to increased torque.
How do you tell if a motor is 2 pole or 4 pole?
Forgive me mentioning, the straightforward way to tell is to look at nameplate speed and figure it form there. 60hz motor at just below 3600rpm is 2-pole, at jut below 1800rpm 4 pole, just below 1200rpm6 pole.
What is the use of pole?
A utility pole is a column or post used to support overhead power lines and various other public utilities, such as electrical cable, fiber optic cable, and related equipment such as transformers and street lights.
What are poles?
A geographical pole or geographic pole is either of the two points on Earth where its axis of rotation intersects its surface. The North Pole lies in the Arctic Ocean while the South Pole is in Antarctica. Relative to Earth’s surface, the geographic poles move by a few metres over periods of a few years.
How many Poles does a AC motor have?
Common AC motor units are constructed with either two or four poles. A magnetic field is created in the stator poles that induces resulting magnetic fields in the rotor which follow the frequency of the changing magnetic field in the stator.
How do you count motor poles?
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 synchronous motor speed?
The synchronous speed of an AC motor is determined by the frequency of the source and the number of poles. The RPM is calculated by multiplying the frequency times 60 and dividing by the number of pairs of poles. Some motors are designed to operate at synchronous speed.
How is motor pole calculated?
The formula is n = 60 x f /p where n = synchronous speed; f = supply frequency & p = pairs of poles per phase. The actual running speed is the synchronous speed minus the slip speed.
What is single phase motor?
What is a single-phase motor? A single-phase motor is an electrically-powered rotary machine that can turn electric energy into mechanical energy. It works by using a single-phase power supply. They contain two types of wiring: hot and neutral. Their power can reach 3Kw and supply voltages vary in unison.
What does pole mean?
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.