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What is the relation between speed and pole?

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What is the relation between speed and pole?

Motor Wiring and Number of Poles More poles result in a lower motor speed: if all other factors are equal, a 4-pole motor will rotate at half the speed of a 2-pole motor. 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.

How do you calculate motor speed from poles?

Poles = number of poles of your motor. So, for example, if you have a 4 pole motor on 60 Hz then RPM=60*(2/4)*60=1800 rpm.

What speed is a 10 pole motor?

600 rpm
A: A 10-pole motor would have 5-pairs of N-S poles. It would rotate at 50/5 = 10 rotations per second or 600 rpm (10 s-1 x 60 s/minute).

What speed does a 2 pole motor run at?

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3,600 rpm
A two-pole motor operates at 3,600 rpm (7,200 rpm ÷ 2) unloaded, and approximately 3,450 under load. Two-pole motors often are found in pump applications, such as sump pumps, swimming pool pumps, and water recirculating equipment.

What is the formula for motor speed?

How to Calculate Motor RPM. To calculate RPM for an AC induction motor, you multiply the frequency in Hertz (Hz) by 60 — for the number of seconds in a minute — by two for the negative and positive pulses in a cycle. You then divide by the number of poles the motor has: (Hz x 60 x 2) / number of poles = no-load RPM.

What is the relation between speed frequency and number of poles?

Relationship between Speed and Frequency Let the speed of the rotating magnetic field is N revolution per minute(RPM). In a one complete cycle one pole pairs passes over the coil. Therefore, the frequency of one pole pair passing is N/60.

What is motor speed formula?

What is speed of motor?

Speed of a motor is the magnitude of the rotational velocity of the motor shaft. In a motion application, speed of the motor dictates how fast the axis rotates – the number of complete revolutions per unit time.

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How do you tell if a motor is 2 pole or 4 pole?

RE: How to tell how many poles a motor has. 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 synchronous speed of a 4 pole motor?

1800 revolutions per minute
Considering a 60 Hz power source, at what speed does a four-pole synchronous motor run? The correct answer is B, 1800 revolutions per minute (RPM).

What is the difference between 2 pole and 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.

What is relation between speed and frequency and number of poles of a synchronous motor?

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. This was explained in Chapter 6.

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What is the speed of a 12 pole motor?

The speed of a 12-pole, 480V, 60Hz three-phase induction motor at full load is 560 rpm.

Why are motors with different number of Poles?

Pole pairs is there because that any pole must be constructed in a pairs top and bottom / left right, so with one cycle it will move half the distance. If you are using 50Hz and have a two pole motor 60 x 50 / 1 = 3000 rpm.

What speed range can you expect from VFD?

Glenn, you will typically get about a 10:1 speed range (6 to 60 Hz, or about 175 to 1725 RPM) with a standard VFD. In this range you will get full motor torque. But as Forrest points out, you may still need to use the mechanical system to get lower speeds or torque multiplication.

How many Poles does my motor have?

In the simplest three-phase motor, there are 3 separate electromagnets formed by the single set of three-way windings. Thus, there is a set of North-South electromagnetic poles formed. This motor is said to have “2 poles” (although strictly speaking, the motor has 6 electromagnetic poles).