How does the consequent pole motor change speed?
Since the number of poles has been doubled, the magnetic field will travel only half as far during one complete cycle. Consequent pole motors have an advantage over some others types of variable speed alternating current motors in that they maintain a high torque when speed is reduced.
How many speeds does a consequent pole motor have?
Consequent pole motors have a single winding for two speeds. Extra taps can be brought from the winding to permit reconnection for a different number of stator poles. The speed range is limited to a 1:2 ratio, such as 600-1200 rpm or 900-1800 rpm. Two-speed, consequent pole motors have one reconnectable winding.
What is a consequent pole motor?
A Consequent Pole Winding is a three-phase AC induction motor winding that is concentric wound (coil inside of a coil), but it only utilizes half the coil groups of a Concentric Winding.
What is 2 pole 4 pole and 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.
What is the advantage of consequent pole motors over some other types of variable speed motors?
What is the advantage of consequent pole motors over some other types of variable speed motors? They maintain a high torque when speed is reduced. A consequent pole motor has synchronous speeds of 1800, 1200, and 900 RPM.
What is the difference between 2 pole and 4 pole motor?
2 pole motor has two poles (or a single pair of magnetic poles) while 4 pole motors have four magnetic poles in alternating order. 2 pole motors have twice the speed of a 4 pole motor.
What is a consequent pole?
Definition of consequent pole : any one of the magnetic poles that appear in a nonuniformly magnetized body excepting those poles near its ends.
How many Poles does a 3-phase motor have?
The most basic 3-phase brushless motor is a 2-pole 3-slot motor. There are various combinations such as 4-pole 3-slot, 4-pole 6-slot, and 16-pole 12-slot. When the number of poles and the number of slots increases, a large torque can be obtained and the torque pulsation also decreases.
How do you calculate motor poles?
The actual running speed is the synchronous speed minus the slip speed. 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).
Which is better 2 pole or 4 pole motor?
2 pole motors have twice the speed of a 4 pole motor. Rotor of the 2 pole motor complete one cycle for every cycle of the source, while the rotor of the 4 pole motor completes only half a cycle for every single cycle of the source. Therefore, 4 pole motors consumes twice the energy of the 2 pole motors.
How do you calculate the number of poles on 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 speed is a 4-pole motor?
around 1800 rpm
Two pole AC motors operating at 60 Hz will always run at approximately 3600 rpm, and four pole AC motors will have speeds around 1800 rpm. Example 120 x 60 hertz / 4 poles = 1,800 rpm.
How many RPM is a 10 pole motor?
Synchronous rotation speed at different frequencies and number of poles
| Shaft rotation speed – n – (rev/min, rpm) | ||
|---|---|---|
| Frequency – f – (Hz) | Number of poles – p – | |
| 10 | 600 | 120 |
| 20 | 1200 | 240 |
| 30 | 1800 | 360 |
What is a consequent pole magnet?
How do you count motor poles?
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.
What is pole formula?
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.