Author name: Engr. Aneel Kumar

STARTER FOR A TWO VALUE CAPACITOR MOTOR USING A CURRENT RELAY AND AN AUTO TRANSFORMER

This type of starter uses a current relay in series with the main winding and an auto-transformer in the auxiliary winding to increase the effective value of the capacitors in the auxiliary winding circuit. The circuit has been shown in Figure. In this circuit, when contactor M is energized, a high inrush current flows through […]

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PLUG REVERSING OF CAPACITOR START MOTORS

The capacitor start motors suffer from the disadvantage that they are not easily reversible due to the centrifugal switch connected in the auxiliary winding. The motor cannot be instantaneously reversed by simple control as the auxiliary winding remains disconnected till the motor comes near to zero speed. However, by proper design of the control circuit

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SEMI AUTOMATIC AND AUTOMATIC CONTROL OF MODERN MACHINERY

Control of a machine can be semi-automatic or fully automatic. There are probably more machines operated by semi-automatic control than by manual or fully automatic controls. Consider, for example, an over-head tank which supplies drinking water to a factory. If we provide a manual switch near the pump motor and depute an operator to switch

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ADVANTAGES OF MAGNETIC CONTROL OF MACHINES

Having discussed the starting and stopping of a motor by using control devices like push buttons, contactors and over-load relays, we are in a position to discuss the advantages of magnetic control over the manual control. The various advantages are listed as follows: 1) Magnetic control permits installation of power contacts close to motor whereas

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