How can you reduce the torque of a DC motor?

How do you reduce torque?

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.

How do I lower the RPM on my electric motor?

A couple of things you can do:

  1. Use gears to change ratio of speed, which is what you’re going to do. …
  2. Use a stepper motor, which are commonly used for high-torque, low RPM applications.
  3. Find some sort of PWM control circuit to slow it down, although you probably won’t be able to get it down to 5-10RPM.

Which DC motor has high torque?

Series wound DC motors are best for applications that require high startup torque, without the need for speed regulation. Like a shunt motor, as a load is applied to a DC series motor, the motor speed decreases, which reduces the back EMF and increases the net voltage.

How do you increase or decrease torque?

Torque can be increased in two ways: 1) by increasing the moment arm or 2) increasing the perpendicular force applied to the moment arm. The opposite is true for decreasing torque. If an object is at rest the torques on the object are balanced (they cancel out) and sum of those torques is zero.

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What causes torque to decrease?

At high RPM, torque drops off primarily from intake and exhaust flow restriction. Volumetric Efficiency declines because the engine can’t breathe any faster. Mechanical efficiency also declines at higher RPM, due to increased frictional resistance. This further reduces torque at the output.

Does torque decrease as rpm increases?

When the rotational speed is higher, a cylinder peak pressure is shifted towards later part of power stroke and all the p-V diagram is less and less beneficial. The other thing causing lowering of torque at higher rpm’s will be higher mechanical losses in this range. … so it causes a decrease in torque.

How can we change the speed of a DC motor using PWM?

If such a signal is fed to a DC motor, we can change the speed of the motor by changing the duty cycle of the PWM signal. The change in pulse width is created by increasing the on-time (HIGH value) of the pulse while reducing the off-time (LOW value) by the same amount so that the frequency of the signal is constant.

How do you slow down a 12v DC fan?

2 Answers

  1. Add a potentiometer in series with the power cable. This would allow you to change the speed quite easily. …
  2. control the fan using pwm. This could be with a microcontroller or just a 555 oscillator through a transistor. …
  3. Have a constant current circuit.

How does Arduino reduce dc motor speed?

IN1 pin of the L298 IC is connected to pin 8 of the Arduino while IN2 is connected to pin 9. These two digital pins of Arduino control the direction of the motor. The EN A pin of IC is connected to the PWM pin 2 of Arduino. This will control the speed of the motor.

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