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 a consequent pole?
: any one of the magnetic poles that appear in a nonuniformly magnetized body excepting those poles near its ends.
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.
How is the speed of a consequent pole motor change?
How is the speed of a consequent-pole squirrel-cage motor changed? The synchronous speed of the consequent-pole squirrel-cage motor can be changed by changing the number of stator poles. If the number of poles is doubled, the synchronous speed is reduced by one-half. 1800 rpm.
How many speeds can be obtained from a consequent pole motor that contains only one stator winding?
If the current direction is opposite through each pole piece, they will produce opposite magnetic polarities and are essentially two poles. Two-speed consequent pole motors contain one reconnectable stator winding.
What is the pole in the motor?
The motor drive energizes stator teeth one after the other to make the rotor turn, thanks to its magnets’ tendency to force alignment with the stator teeth. 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.
How is motor pole calculated?
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.
What is Dahlander winding?
A Dahlander motor achieves different speeds by switching the configuration of the electrical windings, indirectly adding or removing poles and thus varying the rotor speed. The poles can be varied at a ratio of 1:2 and thus the speed can be varied at 2:1.
Which type of induction motor is best for pole changing method?
Which type of Induction motor is best for pole changing method? Explanation: Pole changing method is used to control the speed of Induction motor. It is only applicable for SCIM because SCIM rotor is made up of aluminum, copper bars. 7.
What is pole changing method?
Pole Changing Method is one of the main methods of the speed control of an induction motor. This method of controlling the speed by pole changing is used mainly for cage motor only because the cage rotor automatically develops a number of poles, which is equal to the poles of the stator winding.
What determines when a synchronous motor is at normal excitation?
What determines when a synchronous motor is at normal excitation? The synchronous motor has the capability to correct its own power factor and the power factor of other devices connected to the same line. The amount of power factor correction is controlled by the amount of excitation current in the rotor.
What is the name of the motor part that rotates during operation?
With this simple understanding, we can divide any motor into two physical parts; one part which rotates—called the rotor—and one part which doesn’t— called the stator. Figure 1 shows a simple diagram of an electrical machine showing the rotor and stator. DC motors use DC current and voltage to power the motor.
When a stepping motor is connected to AC power how many phases must be applied to the motor?
When a stepping motor is connected to AC power, two phases must be applied to the motor. Stepping motors can be operated on AC. In this mode of operation, they become two-phase AC synchronous motors and are classified as permanent magnet induction motors.
Why can’t an induction motor run at synchronous speed?
The Induction Motor cannot run at Synchronous speed because the Slip is never zero in an Induction Motor.
Does varying the voltage to an AC induction motor cause a change in synchronous speed?
Does varying the voltage to an AC induction motor cause a change in synchronous speed? No. Frequency and number of stator poles determines synchronous speed. … The high impedance prevents the motor from producing a large amount of torque.