- Why is it necessary to control the speed of a DC motor?
- What are the factors that affect the speed of a DC motor?
- Which battery is best for DC motor?
- How can I reduce the speed of a 12v DC motor?
- How do you reduce motor speed?
- What is the speed of dc motor?
- How long can a DC motor run continuously?
- What controls the speed of a DC motor?
- How do I make my computer fan run slower?
- What causes a DC motor to run away?
- Can you slow down an AC motor?
- How do you increase motor speed?
- How do I increase fan speed with low voltage?
- Are all DC motors reversible?
- How do you slow down a 12v DC fan?
- How do I slow down my exhaust fan?
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..
What are the factors that affect the speed of a DC motor?
Factors Affecting Motor PerformanceVoltage of Power Supply.Type of Power Supply.Winding Specifications.Environmental Temperature.Type of Magnet.Flux Yoke.Phase.
Which battery is best for DC motor?
7.2V: six AA or AAA rechargeable NiMh batteries is perfect for 7.2V DC gear motors. These are usually in a battery pack rather than as individual cells and you will need a more specific NiMh battery pack charger. 7.4V: two LiPo cells can often power a microcontroller and works great for 7.2V DC gear motors.
How can I reduce the speed of a 12v DC motor?
Thus, the speed of a DC motor can be controlled in three ways:By varying the supply voltage.By varying the flux, and by varying the current through the field winding.By varying the armature voltage, and by varying the armature resistance.
How do you reduce motor speed?
So, if you want to decrease speed, decrease voltage. If you want to decrease torque, decrease current. If you increase torque (say by putting a brake on the motor), you are increasing motor torque. But if you don’t change the supply of electrical power, then the mechanical power also won’t change.
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.
How long can a DC motor run continuously?
You should anticipate, given proper attendance, that the motor can run continuously for the life of its brushes, which should be in the range of six months to a year. Presuming that the motor is too small to have its brushes changed by a trained electrician while running.
What controls the speed of a DC motor?
Thus, the speed of a DC motor can control in three ways: By varying the flux, and by varying the current through field winding. By varying the armature voltage, and the armature resistance. Through the supply voltage.
How do I make my computer fan run slower?
How to Change the Fan Speed on a LaptopClick on the Start menu and select “Control Panel.” Next, choose “Performance and Maintenance.”Select “Power Saver.”To slow the fan speed, locate the slider next to “CPU Processing Speed” and slide it down by moving across to the left. To speed up the fan, move the slider to the right.Tip.
What causes a DC motor to run away?
With no mechanical load on the series motor, the current is low, the counter-Electro motive force produced by the field winding is weak, and so the armature must turn faster to produce sufficient counter-EMF to balance the supply voltage. The motor can be damaged by overspeed. This is called a runaway condition.
Can you slow down an AC motor?
Slowing down a single phase AC motor can be complicated and expensive. They are usually built to be run at a certain speed and anything else would be tricking it to do something it wasn’t meant to. Simply slowing it down may cause it to overheat with reduced mechanical self-cooling.
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.
How do I increase fan speed with low voltage?
After the start, a run capacitor is there in the service which improves the power factor and keeps the motor running at its rated speed. In order to regulate the fan speed, a regulator is provided which varies the voltage across the winding and thus controls the speed. Lower the voltage lower the speed of the fan.
Are all DC motors reversible?
Simply put, DC motors can turn in either direction (clockwise or counter-clockwise) and can be easily controlled by inverting the polarity of the applied voltage. Strictly speaking, the motors can actually create a force in either direction.
How do you slow down a 12v DC fan?
Get a three 1.8 ohm 2 watt resistors, connect them in parallel and put them in series with your fan (put them in the air stream of the fan to help cool them). That should slow your fan down and reduce the load.
How do I slow down my exhaust fan?
With a Shaded Pole motor, you can simply reduce the voltage, say with a light dimmer and the motor produces less torque, then with less torque the air friction on the fan blades causes it to slow down, which in turn moves less air.