Factors affecting speed of dc motor

It depends on how the motor is wired. The Ward-Leonard system uses the armature control method of lowering the speed without the use of series resistors. A generator is used solely to supply the motor armature with the required voltage.

The voltage across the armature3. One of the important features of DC motor is that its speed can be controlled with relative ease.

Speed of DC shunt motor is controlled by the factors stated below .

Having wound your motor, the basic fact of DC motors is: voltage is speed , and current is torque.

Double the voltage, double the speed. Even if the OP has moved beyond this problem, . The ceramic bar magnet provides the magnetic field in this simple DC motor. With the magnet in position, the magnetic field is directed vertically.

Factors affecting the speed of rotation of the d. This allows the magnetic field to be concentrated at the coil which increases the magnetic . Typical applications of electric drives include fans, ventilators, compressor pumps , . When you need high starting and acceleration torque, predictable motor speed properties, compact size, and energy efficiency, permanent magnet DC (PMDC) motors may be the solution.

Proper application will help you get the most out of them. Brushed motors were the first commercially important application of electric power to driving mechanical energy, and DC distribution systems were used for more than 1years to operate motors in commercial and industrial buildings. Brushed DC motors can be varied in speed by changing the operating voltage or the . However , if both of these factors are reversed at the same time, the motor will continue rotating in the same direction.

For example, the voltage drop across the armature depends upon the back e. Shunt, series and compound windings are used to obtain different motor characteristics by varying the above factors.

In addition, the ratio of delivered torque to the size of the motor is higher, making it useful in applications where space and weight are critical factors , . Motor speed is defined by two main factors. How would the inductance of the field winding affect the motor operation under steady-state? This concept can be illustrated for three phase motors by considering three coils placed equally around the rotor.

Each coil is connected to one phase of a. The number of magnetic poles (or simply poles) is the principal design factor affecting speed in AC motors.

Depending upon these factors the various methods of speed control are,.