Thus each winding has four poles, i.e. the motor is referred to as a four-pole machine. Figure 4 shows that when the windings are connected to a three-phase supply, the magnetic field rotates at half the frequency of the supply. So for a 60 Hz supply, the field rotation speed is 30 rev/sec, i.e. 1800 r.p.m.
What is a 4 pole 3-phase motor?
With a 4-pole machine, the rotor will move from 1 pole pair to the next in 1 AC supply cycle, so will do half a rev in one supply cycle – the synchronous speed is therefore 50/2 revs per second, or 1500 rpm. A 4-pole induction motor will have a nominal speed of 1450 rpm or thereabouts.
How many coils does a four pole three phase motor have?
4 poles X 3 phases = 12 sets of coils. 12 sets of coils into 24 slots means each set will have 2 coils. Each coil set has 1/4 of the stator (4 poles) to set up its magnetic field, or 6 slots, so the first coil in set 1 should span from the bottom of slot 1 to the top of slot 5.
What is the number of poles in motor?
Although small motors usually have four poles, two-pole motors are also used for high-speed applications that require 50 or 60 rotations per second.
What phase is a 4 pole motor?
The 3-phase 4-pole (per phase) synchronous motor will rotate at 1800 rpm with 60 Hz power or 1500 rpm with 50 Hz power.
Is a 2 pole motor faster than a 4 pole motor?
2 pole motor has high speed due to less number of poles. A 4 pole motor has low speed due to more number of poles. 2 pole motor has less workout when compared to a 4 pole motor.
How many RPM is a 6 pole motor?
Six-pole motors run at 1,200 rpm unloaded (7,200 Ã· 6) and between 1,050 and 1,175 rpm loaded.
Is a 2 pole motor 3-phase?
Lest there be any confusion: poles always appear in pairs. The windings generate alternating N (north) and S (south) poles. As a result AC motors are 2-pole, 4-pole, 6-pole, etc. … Therefore a 2=pole, 3-phase motor will have six poles.
What are the poles in a 3-phase motor?
For a 3-phase motor, if you count a total of 12 coil groups, it has 4 magnetic poles. For a 12-pole 3-phase machine, there will be 36 coils. The number of magnetic poles in the rotor is equal to the number of magnetic poles in the stator.
How many coils does a 6 pole motor have?
For six-pole winding all the eight coils are connected in series.
How do you tell if a motor is 2 pole or 4 pole?
The main difference between 2 Pole Motors and 4 Pole Motors is that 2 Pole Motors have a single pair of magnetic poles whereas 4 Pole Motors have two pairs of magnetic poles.
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).
How many RPM is a 2 pole motor?
Motor Wiring and Number of Poles
A 60 Hz power supply changes polarity 60 times per second, and a two-pole motor will spin at 3,600 rpm when connected to this source. A four-pole motor will only rotate at 1,800 rpm. For 50 Hz motors, the speed is 3,000 rpm with 2 poles, and 1,500 rpm with 4 poles.
What is a 6 pole motor?
6 poles = 1,000 RPM (~970 RPM) 8 poles = 750 RPM (~720 RPM) For a 60 Hz three phase supply: 2 poles = 3,600 RPM (nameplate would list around 3,500 RPM) 4 poles = 1,800 RPM (~1,740 RPM)
What is the difference between a 4 pole and 6 pole motor?
For example, a 6 pole motor may offer more torque and faster acceleration, where the 4 pole motor might offer faster top speed and these variables are all unknown without a dyno and without exhausting all mechanical/electronic tuning options to find the optimal peak power curve for each motor under the same load.
What does 4 pole generator mean?
4-pole synchronous motors and generators have solid rotors with salient poles while 4-pole induction motors and generators have squirrel cage rotors. … ABB’s 4-pole rotor design with salient poles (i.e. synchronous motor or generator rotor) has a large diameter with plenty of inertia, providing excellent speed stability.