What are the two types of speed controller?
There are four basic motor controller and drive types: AC, DC, servo, and stepper, each having an input power type modified to the desired output function to match with an application.
What are the factors that control the speed of a DC motor?
Thus, there are three general methods of speed control of D.C. Motors.
- Resistance variation in the armature circuit: This method is called armature resistance control or Rheostat control.
- Variation of field flux Ф This method is called field flux control.
- Variation of the applied voltage.
What are two ways to increase the speed of a DC motor?
The speed of the motor can be increased by:
- increasing the strength of the magnetic field.
- increasing the current flowing through the coil.
How do you control the speed of a DC motor?
Speed adjustment of a DC series motor by armature control may be done by:
- Armature Resistance Control Method.
- Shunted Armature Control Method.
- Armature Terminal Voltage Control.
What is the speed of dc motor?
DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.
What is synchronous speed?
: a definite speed for an alternating-current machine that is dependent on the frequency of the supply circuit because the rotating member passes one pair of poles for each alternation of the alternating current.
Why is it necessary to control the speed of a DC motor?
DC Motors plays an important role in energy conversion process. It is a machine which converts electrical energy into mechanical energy. In mechanical system, speed varies with number of task so speed control is necessary to do mechanical work in a proper way. It makes motor to operate easily.
How can we increase the rpm of dc motor?
By increasing the voltage of the armature, it produces more magnetic forces to overcome the field magnet, increasing the rpm. By increasing the field current, more magnetic fields opposing the motion are produced, at the same time more cemf is produced reducing the armature voltage, decreasing the rpm.
What are the 3 types of DC motors?
Main Types of DC Motors
- Permanent Magnet DC Motors. The permanent magnet motor uses a permanent magnet to create field flux. …
- Series DC Motors. In a series DC motor, the field is wound with a few turns of a large wire carrying the full armature current. …
- Shunt DC Motors. …
- Compound DC Motors.
What are two ways to increase the speed of the motor?
The speed of the rotation of the electric motor is increased by changing the current, by increasing the strength of the current which is supplied to the electric motor, then the speed of the rotation of the electric motor can be increased.
How do you make a motor faster?
One easy way to make the motor run faster is to add another magnet. Hold a magnet over the top of the motor while it is running. As you move the magnet closer to the spinning coil, one of two things will happen. Either the motor will stop, or it will run faster.
How can we increase the speed of motor?
As several people have already stated, it is possible to increase the speed of an ac motor by increasing the input frequency to the motor. This is done in industry by adding a variable frequency drive.
Which DC motor is preferred for constant speed?
Explanation: Rotary compressor generally demand constant speed operation throughout the load. Sometimes, DC machines are not able to produce constant speed throughout the process hence, synchronous machine is used. 4.
What is the most common method used in varying the speed of a DC motor?
(5.10). This reduces the voltage available across the armature and hence the speed falls.By changing the value of variable resistance, any speed below the normal speed can be obtained. This is the most common method employed to control the speed of d.c. series motors.