HI MY PROBLEM IS THE FOLLOWING...

HOW WERE THE MAIN DIS ADVANTAGES OF A SHUNT AND SERIES MOTOR OVERCOME?...

COMPARE THE LOAD CHARACTERISTICS OF A SHUNT, SERIES AND COMPOUND WOUND MOTORS...

HOW DO THE FIELD WINDINGS OF A COMPOUND WOUND MOTOR DIFFER FROM THE FIELD WINDINGS OF A SHUNT AND SERIES WOUND MOTOR?..

http://zone.ni.com/devzone/cda/ph/p/id/47

To answer your questions, let's break them down one by one:

1. How were the main disadvantages of a shunt and series motor overcome?
- The main disadvantage of a shunt motor is its speed regulation, as it tends to decrease significantly as the load increases. To overcome this, a device called a "load compensator" is often used to maintain a constant speed.
- In the case of a series motor, its biggest drawback is the potentially dangerous runaway speed characteristic when there is no load. This issue was addressed by introducing a "speed control switch" to limit the maximum speed.

2. Load characteristics of a shunt, series, and compound wound motors:
- Shunt Wound Motor: These motors have a relatively constant speed regardless of the load. They are ideal for applications requiring stable speed but can experience a drop in torque under heavy loads.
- Series Wound Motor: These motors provide high starting torque and are commonly used in applications that require a large initial force, such as electric traction. However, their speed can vary greatly depending on the load.
- Compound Wound Motor: This motor combines the characteristics of both shunt and series motors. It offers good starting torque and speed regulation, making it suitable for applications that require both steady speed and high starting torque.

3. Differences in the field windings of a compound wound motor compared to shunt and series wound motor:
- Shunt Wound Motor: The field winding of a shunt motor consists of many turns of small wire, resulting in high resistance and low current. This configuration allows for greater speed regulation.
- Series Wound Motor: The field winding of a series motor is made of a few turns of heavy wire, resulting in low resistance and high current. This design provides high starting torque but can lead to variable speed.
- Compound Wound Motor: This motor incorporates both a shunt field winding and a series field winding. The shunt winding is connected in parallel with the armature, while the series winding is connected in series with the armature. This combination offers the advantages of both types, providing both good speed regulation and high starting torque.

For additional information and resources, you can visit the link you provided: http://zone.ni.com/devzone/cda/ph/p/id/47. It provides further details on motor types and their characteristics.