Well many people attempt to control the speed of a DC motor using a large variable resistor (Rheostat) in series with the motor as shown. … One simple and easy way to control the speed of a motor is to regulate the amount of voltage across its terminals and this can be achieved using “Pulse Width Modulation” or PWM.
Which device can be used to control the speed of a motor?
Motor Controllers and Drives are electrical or electronic devices that regulate motor speed, torque, and position outputs. The drive modifies the power input to the motor to achieve the desired output.
Which method is used to control the speed?
In practice, the variation of these three factors is used for speed control. 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. This method is called field flux control.
What are the factors that control motor speed?
Factors Affecting Motor Performance
- Voltage of Power Supply.
- Type of Power Supply.
- Winding Specifications.
- Environmental Temperature.
- Type of Magnet.
- Flux Yoke.
How do you increase motor speed?
Increasing the speed can be achieved by increasing the supply frequency as the speed and frequency are directly proportional; however, there are two constraints. The first is the saturation of the magnetic circuit, but this issue can be significantly avoided by keeping the V/f ratio constant.
What is control speed?
: equipment designed to operate automatically under certain conditions to keep the speed of a railroad train within a predetermined rate.
Why do we need to control the speed of motor?
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. Shunt motor is a special type of DC motor which runs at a constant speed. But using field and armature rheostat control method we can make it more versatile.
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 motor speed?
The speed of a motor, measured in revolutions per minute (rpm), defines a motor’s ability to spin at a rate per unit time. … An electrical signal is applied to the input of the motor, and the output of the motor produces a defined amount of torque related to the characteristics of the motor.
Why commutators are sparking heavily?
Sparking can be caused by numerous conditions like motor overload, vibration, high humidity, worn brushes and worn commutators. When checking for sparking or arcing, a good visual inspection of thecommutator and brushes will have to be performed.
Which motor has the poorest speed control?
Which of the following DC motor has the poorest speed control? Explanation: DC series motor at no load condition gives infinite speed ideally. Practically it will damage all the armature circuit. Thus, as the load is reduced speed of the motor will go on increasing rapidly.