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What size of magnetic starter would be necessary to control a 3 phase 208 volt 5hp squirrel cage induction motor?
Wiki User
∙ 11y ago
The starter is sized by amperage of the motor. The first thing that has to be done is find the the current by using this formula for amperage when the HP is known. I = HP x 746/1.73 x E x %eff x pf.
A standard motor's efficiency between 5 to 100 HP is .84 to .91.
A standard motor's power factor between 10 to 100 HP is .86 to .92.
Amps = 5 x 746 = 3730/1.73 x 208 = 3730/360 x .84 x .84 = 3730/ 254 = 14.68 amps
A three phase size 1 magnetic starter is rated for 27 amps and can be used up to 7.5 HP.
If the voltage was 460 to 575 a size 0 could be used.
Wiki User
∙ 11y ago
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Squirrel Cage Induction Motor Disadvantages:Some of disadvantages or demerits of squirrel cage induction motors are listed below:Main disadvantage of squirrel cage induction motor is that they have poor starting torque and high starting currents. Starting torque will be in the order of 1.5 to 2 times the full load torque and starting current is as high as 5 to 9 times the full load current. In slip ring induction motors, higher starting torque can be attained by providing an external resistance in the rotor circuits during starting of the slip-ring induction motor. This arrangement in slip-ring induction motors also reduces the high inrush currents during starting of induction motor.Squirrel cage induction motors are more sensitive to the supply voltage fluctuations. When the supply voltage is reduced, induction motor draws more current. During voltage surges, increase in voltage saturates themagnetic components of the squirrel cage induction motor.Speed control is not possible in squirrel cage induction motor. This is one of the major diadvantages of squirrel cage induction motors.The total energy loss during starting of squirrel cage motor is more compared to slip ring motors. This point is significant if the application involves frequent starting
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