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Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

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BuyFindarrow_forward

Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 26, Problem 2SQ
Textbook Problem
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Why is the power not interrupted when the motor makes the transition from start to run?

To determine

Explain the reason for the power is not interrupted when the motor makes the transition from start to run.

Explanation of Solution

The motor starting with the primary resistor starter method provides the closed transition starting which is a process of starting the motor form low starting voltage to full line voltage using the resistor starters. In resistor starters, each resistor connected in series has the load contacts (shunt contacts) in parallel. The resistor starters can have one or more resistors in series called acceleration steps. In the starting instant of a motor, all the resistors are connected with the motor starting winding in series and provide the reduced starting voltage to the motor due to the voltage drop across the resistors. The motor starts with low voltage and low starting current. In the process of accelerating the motor, the resistors in the starter to be short with the help of shunt contacts one by one (if two or more resistors are used) for the smooth and gradual increase in acceleration...

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