What is the advantage of more poles in motor?

As the number of poles is increased, the magnetizing current of the motor increases and the motor can deliver the higher starting as well as the running torque. The frame size of the motor increase with an increase in the number of poles.

What is a 8 pole electric motor?

8 POLE: Relates to a motor that has a synchronous speed of 750rpm. Motors in this speed range, with losses allowed will run between 670rpm for the smaller units and up to 740 + rpm in the larger models. Aluminium Motors up to 112 Frame are available with rotatable terminal box and removable feet.

How do you determine the number of poles a motor has?

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.

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.

What does a 6 pole motor mean?

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’s the difference between 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.

How many RPM is a 6 pole motor?

1,200 rpm
Six-pole motors run at 1,200 rpm unloaded (7,200 ÷ 6) and between 1,050 and 1,175 rpm loaded.

What is a 6 pole 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.

How many RPM is a 8 pole motor?

900 rpm
To satisfy consumers’ desires for quieter motors, manufacturers have developed eight-pole motors. These operate at 900 rpm (unloaded) and approximately 800 rpm under load. They are being used in applications where customers expect quieter operation, such as room air conditioners and outdoor heat pump applications.

How many coils does a 6 pole motor have?

To create a six pole motor use six coils per phase that creates three north poles and three south poles and so on. The number of stator slots is always a multiple of six.

What does the number of Poles mean on a motor?

What is the difference between a 2 pole and 4 pole motor?

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. As speed decreases, torque increases so an 8 pole motor has 4x the torque of a 2 pole motor (but 1/4 the speed).

How do you find the number of Poles in a motor?

The number of poles directly affects the speed of the motor. Their relationship is: synchronous speed = 60 × frequency / level logarithm. If the synchronous speed of the motor is 1500 rpm, the pole pair number can be calculated according to the above equation, which is a 4-pole motor.

What is the synchronous speed of an 8-pole motor?

As speed decreases, torque increases so an 8 pole motor has 4x the torque of a 2 pole motor (but 1/4 the speed). The synchronous speed of motor depends on number of poles so in order to achive different speed number of poles used are different. Synchronous speed = 3000, 1500, 1000, 750.

What is the purpose of a 60Hz motor with pole pairs?

The 60 is there to convert from revolutions per second to revolutions per minute as the frequency is in cycles per second. 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.