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The speed of DC motors need to be controlled because that is what the application needs. In some cases, it is to protect the motor or the attached equipment. In toys and robots, you'd want different speeds. Electric cars such as Golf carts would need to control the speed of a DC motor so you can easily drive it like driving a car with a gasoline engine.
Tape recorder motors contain a flywheel and a governor to regulate their speed so the tape will move at an even and standard rate. If the motor starts to get a little too fast, its contacts inside open up to briefly power down the motor and when it is slow enough, the contacts close again. So this helps to compensate for different amounts of battery charge and for different operating conditions.
Record players have a simpler job of regulating their speed since most use alternating current and a simple induction motor. Since the voltage and frequency is constant, no governors are needed. Unless the bearings go bad, the motor will run at that fixed rate.
armature control method
field flux control
voltage control method
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We are changing the DC motor speed by field control method
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What is DC drives?
A DC drive is a kind of equipment ordinarily do control a speed, tension and current on a Direct Current Motor (DC Motor), in order to have a certain process transformation under control.
Why do we connect a transistor to a DC motor?
Transistors are not normally connected to dc motors, but it is possible to use transistors in a speed-control mechanism for a motor.
How to control speed of dc motor using microprocessor 8085?
Here the DC motor is controlled by the microprocessor (8085). The kit used was dynalog 8085 kit. The DC motor is very difficult to control unlike the stepper motor, which can be controlled by giving the appropriate CONTROL WORD. By knowing the DC motor theory we know the different methods used to control the motor, the most primitive and the once upon a time the most popularly method was WARDLEONARD motor speed control, but this had many disadvantage, so the world of Electronics brought in the thyristor control, which were very flexible and can be employed to use AC instead of DC cause they had a inbuilt convertor. The thyristor-based system is good but when used with Microprocessor based speed controller they are really good. We have shown the block diagram, circuit diagram used by us to control a small tape recorder sized motor
Why can't you change direction of a DC motor by reversing the line wires?
in some cases we need a desired speed, like in cassette stereo system we need the proper speed so that we can listen the song in a proper manner so we need to control the speed of motor. more example-lift,elevator
What is constant speed DC motor?
Dc shunt motor is constant speed motor.Its speed is constant with armature current.This shunt motor is used in paper mills and drilling machines
What is the importance of speed control of DC motor in industrial applications?
The speed control of the DC motor is important because its speed can be changed over a wide variety of simple methods which is not possible in an AC motor.
Can a DC series motor with speed control be connected on AC supply?
A dc series motor with speed control can be connected on ac supply because dc machines are totally reversible.
Future scope of dc motor speed control using rf?
The DC motor speed control has a scope of four speeds. The control speeds include; high, medium, low, and off.
Why do you control the speed of constant speed dc shunt motor?
no it controls your anus
Why speed control of DC shunt motor is necessary?
The total voltage of the batteries or DC power source connected to a shunt motor affects how first it moves. Increasing the DC voltage will make the shunt motor run faster.
What are the advantages of speed control of DC motor using micro-controller when compared to other?
This motor is able to work from the battery. The speed is less complicated to use and you do not need much voltage.
What is DC drives?
A DC drive is a kind of equipment ordinarily do control a speed, tension and current on a Direct Current Motor (DC Motor), in order to have a certain process transformation under control.
Ac motor best or dc motor best?
that depends on your requirement. if you need low cost ,maintenance free, single speed then ac is the best option. if you need greater degree of speed control then dc is the best option. but it is costly, requirs rectifiers, high in maintenance.
Why do we connect a transistor to a DC motor?
Transistors are not normally connected to dc motors, but it is possible to use transistors in a speed-control mechanism for a motor.
How do you introduce feedback circuit in dc motor speed control?
By using your brain
Why do you control the speed of DC motors?
because dc motor is a powerful & dangerous motor it is akiller
What using DC then ac?
It is depends on the application. If we need any variable speed in motor, dc motor will be better choice.
