Does a 4 pole motor have more torque?
Does a 4 pole motor have more torque?
4-Pole Motor In four pole motors, the rotor turns 900 for every half cycle. Therefore, the rotor completes 1 cycle for every two cycles of the source. Hence the amount of energy consumed is twice the amount of 2 pole motor and theoretically delivers twice the torque.
What is difference between 2 pole and 4 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.
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.
How do you calculate torque of a motor?
- Torque (lb.in) = 63,025 x Power (HP) / Speed (RPM)
- Power (HP) = Torque (lb.in) x Speed (RPM) / 63,025.
- Torque (N.m) = 9.5488 x Power (kW) / Speed (RPM)
- Power (kW) = Torque (N.m) x Speed (RPM) / 9.5488.
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).
How many RPM is a 4 pole motor?
1,800 rpm
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 torque of a motor?
Torque relates to the rotational force of an electric motor while speed refers to the rate that the motor can rotate. This means that torque is associated with rotational force while speed relates to the rate of rotation which can be calculated by examining the RPMs, or revolutions per minute.
How does number of poles affect motor?
Electrical frequency of a motor is proportional to the number of poles, therefore increasing the pole count increases the electrical frequency. This could negatively affect the system in various ways. The rapidly changing magnetic field induces larger eddy currents in the stator core, which is realized as power losses.
What is the benefit of more poles in a motor?
More poles = electrical-/magnetic- or electromechanical gearing. At same electrical speed, the motor with 2x as many poles will rotate at half speed (hopefully at 2x torque for same size so power remains constant) also more poles will mean less torque ripple, so the motor will run smoother.
What is the formula for calculating torque?
A practical way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force. The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. and the magnitude of the torque is τ = N m.
How is torque calculated?
Measure the distance, r , between the pivot point and the point the force is applied. Determine the angle θ between the direction of the applied force and the vector between the point the force is applied to the pivot point. Multiply r by F and sin θ and you will get the torque.
Which of the motor has high starting torque?
Series wound DC motors are best for applications that require high startup torque, without the need for speed regulation. Like a shunt motor, as a load is applied to a DC series motor, the motor speed decreases, which reduces the back EMF and increases the net voltage.