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Can we get speeds above rated speed by armature resistance control method?
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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.
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)
Is air resistance fluid friction?
At sub-sonic speeds, air resistance is fluid friction. At supersonic speeds, it is not.
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.
Do different objects fall at different speeds?
Air resistance
The sleek shape of a bobsled reduces and allows greater speeds?
What is the sleek shape of a bobsled reduces and allows greater speeds
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.
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 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.
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
What is terminal velocity and how to control it and why it occurs?
Terminal velocity is when air resistance balances out with gravity. For humans it's usually around 2000 ft of falling, gravity accelerates the person towards the ground at about 9.8m/s, as said person speeds up, air resistance increases and it becomes harder to accelerate. Terminal velocity is the point at which one may no longer accelerate. To control it: more air resistance = slower descent (terminal velocity comes sooner and is not as fast (i.e.parachutes), less air resistance = faster descent, it may take longer to reach terminal velocity as it is a much higher speed.
What does the blower resistor do in a 2006 Chevy Express?
The blower resistor controls the speeds of the blower motor Hi-resistance lower motor speed Lo-resistance higher motor speed
