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Name the three basic methods that are used to vary the speed of a DC motor?
speed of a dc motor can be varied by mainly two methods:- 1)field control method 2)armature control method further , field control method can be divided in 3 parts:- 1)field rhestat control method---speed variation is acomplished by means of a variable resistance inserted in series with shunt field 2)reluctance control method---by changing the reluctance of magnetic circuit by choosing right material.. 3) field voltage control method-requires variable field voltage supply. and armature control method can be divided in 3 parts :- 1)armature resistance control---variable resisitance connected in series with armature 2)shunted armature control. 3)armature voltage control. ------------mrityunjay pandey (kiit university ,btech 2nd year)
How speed increases when flux decreases in dc shunt motor?
Increasing flux, torque of the dc motor will be increased and speed of the dc motor will be decreased as speed of the dc motor is inversely proportional to that of the flux and the torque of the dc motor is directly proportional to the flux.
Why do you need to control the speed of a DC motor?
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.
What is double cage rotor and deep bar cage rotor?
deep bars in the rotor that result in higher rotor resistance at low speeds thus resulting in larger starting torques. The higher resistance is due to the skin effect.
Why dc series motor should start with load?
In DC Series Motors the field is in series with Armature. When the motor starts at no load, the armature current is very low and so is the field current. As the speed of DC Motor is inversely proportional to field current, the motor will try to shoot up to very high speed at no load and it can be dangerous for the motor itself and for this reason, any DC Motor should always be started on load.
What are the disadvantages of armature speed control method for a dc motor?
Disadvantages of armature speed control for a DC motor include complexity of control circuitry, increased maintenance due to wear on the brushes and commutator, and limited speed range compared to field control methods. Additionally, armature control can result in lower efficiency and poor performance at low speeds.
Name the three basic methods that are used to vary the speed of a DC motor?
speed of a dc motor can be varied by mainly two methods:- 1)field control method 2)armature control method further , field control method can be divided in 3 parts:- 1)field rhestat control method---speed variation is acomplished by means of a variable resistance inserted in series with shunt field 2)reluctance control method---by changing the reluctance of magnetic circuit by choosing right material.. 3) field voltage control method-requires variable field voltage supply. and armature control method can be divided in 3 parts :- 1)armature resistance control---variable resisitance connected in series with armature 2)shunted armature control. 3)armature voltage control. ------------mrityunjay pandey (kiit university ,btech 2nd year)
How speed increases when flux decreases in dc shunt motor?
Increasing flux, torque of the dc motor will be increased and speed of the dc motor will be decreased as speed of the dc motor is inversely proportional to that of the flux and the torque of the dc motor is directly proportional to the flux.
What is the skiers air resistance?
The air resistance experienced by a skier depends on factors such as speed, body position, and surface area exposed to the wind. Generally, air resistance increases with higher speeds and when the skier adopts a less aerodynamic position. It can affect the skier's speed and control while skiing.
The sleek shape of a bobsled reduces and allows greater speeds?
What is the sleek shape of a bobsled reduces and allows greater speeds
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.
What is a resistor block for on a Dodge Caravan?
The resistor block or blower motor resistor is used to control the speed of the blower motor. That is how you get the lower speeds on your air conditioning or heater. The higher the resistance the lower the speed of the motor.
Why do you need to control the speed of a DC motor?
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.
Why is acceleration less at higher speeds?
At higher speeds, air resistance (drag) increases, requiring more force to maintain the same acceleration. This results in a decrease in acceleration as the speed increases. Additionally, at higher speeds, an object's inertia becomes significant, making it more difficult to accelerate due to the greater resistance to changes in motion.
How does air resistance affect the velocity of falling objects?
Slows an object down or speeds one up.
Why does the blower fan work on speeds 1 and 2 but shuts down on 3 or 4 and then does not work on any speeds?
Two possible issues The motor may be bad and the control shuts down when it is turned up to protect the control The control is bad
Is air resistance fluid friction?
Yes, air resistance is a type of fluid friction. It occurs when an object moves through the air, causing the air particles to exert a force in the opposite direction of the object's motion. This force opposes the object's motion and can affect its speed and trajectory.
