# How can you reduce the speed of a DC motor?

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## 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 are the factors affecting speed of dc motor?

Factors Affecting The Speed Of A D.C. Motor

• The flux Φ
• The voltage across the armature.
• The applied voltage V.

## How do gears slow down a motor?

Say you’re driving at 40mph in fifth gear and approaching a traffic light. If you want to slow down gradually, take your foot off the accelerator and switch to a lower gear, such as second or third (remembering to rev-match as you downshift). This will slow the car down without you having to touch the brakes.

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## How can we increase the rpm of dc motor?

By increasing the voltage of the armature, it produces more magnetic forces to overcome the field magnet, increasing the rpm. By increasing the field current, more magnetic fields opposing the motion are produced, at the same time more cemf is produced reducing the armature voltage, decreasing the rpm.

## How do you make a motor faster?

One easy way to make the motor run faster is to add another magnet. Hold a magnet over the top of the motor while it is running. As you move the magnet closer to the spinning coil, one of two things will happen. Either the motor will stop, or it will run faster.

## 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 do you make a motor spin faster?

The speed of rotation of the coil can be increased by:

1. increasing the size of the current;
2. using a stronger magnet;
3. increasing the number of turns of wire in the coil;
4. reducing friction between the coil and the axel it rotates on.

## How do you calculate the speed of a DC motor?

Speed of a DC Motor

A = number of parallel paths. Z = total no. conductors in armature. Hence, speed of a DC motor is directly proportional to emf of rotation (E) and inversely proportional to flux per pole (φ).

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## How can I reduce my 12V fan speed?

Here’s how we would calculate the resistor value required to run a fan at 7V from a 12V power source, dropping the voltage by 5V. V=IR (Ohm’s Law), so 7 = 60I => I = 7 / 60 = 0.12 (2 d.p.) So to achieve a voltage drop of 5V, we would need a resistor with value of 42 Ohms, and capable of dissipating 0.6W of power.

## 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 two factors controlling the speed of a DC motor?

Factors Affecting The Speed Of Dc Motor

• The applied voltage.
• The flux.
• The voltage across an armature.

28.11.2017

## What are the two ways to increase the speed of a DC motor?

The speed of the motor can be increased by:

• increasing the strength of the magnetic field.
• increasing the current flowing through the coil.

## What are the 3 types of DC motors?

Main Types of DC Motors

• Permanent Magnet DC Motors. The permanent magnet motor uses a permanent magnet to create field flux. …
• Series DC Motors. In a series DC motor, the field is wound with a few turns of a large wire carrying the full armature current. …
• Shunt DC Motors. …
• Compound DC Motors.

5.07.2017