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.
What is pole number?
The pole represents the number of permanent magnet poles for the rotating rotor, and a motor with one pair of N pole/S poles is called a two-pole motor. The number of poles can be 2, 4, 6, 8,…, etc.
What is a 4 pole 3 phase motor?
. For example, for a four-pole, three-phase motor, = 4 and = 1,500 RPM (for = 50 Hz) and 1,800 RPM (for. = 60 Hz) synchronous speed. The number of magnetic poles, , is equal to the number of coil groups per phase.
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. When it comes to the pole number it’s always a multiple of two because the north and the South Pole always come in pairs.
What is pole in AC motor?
Simply defined, a pole is a north or south magnetic field of force that is generated by a permanent magnet or current passing through a coil of wire. … Permanent-magnet stepper motors are the simplest. Manufacturers define their pole count by the number of pole pairs or stator windings.
Is there a 3 phase DC motor?
There is no such thing as a three phase DC motor. Phase implies a time difference between the three supplies.
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).