# Is it voltage or current that controls the speed of the DC motor?

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V is the supplied voltage, Eb is the back EMF, Ia is the armature current, and Ra is the armature resistance. Eb = (PøNZ)/60A. This implies three things: The speed of the motor is directly proportional to supply voltage.

## Is motor speed controlled by voltage or current?

Back to the original question: how does voltage affect speed? From the analysis above, we can see that when the load (torque) on the motor is constant, speed is directly proportional to supply voltage. And, when the voltage remains constant, an increase in the load (torque) on the motor results in a decrease in speed.

## Does DC motor speed depends on voltage or current?

The above equation shows that the speed depends upon the supply voltage V, the armature circuit resistance Ra, and the field flux Ф, which is produced by the field current. In practice, the variation of these three factors is used for speed control.

## Does current affect speed of motor?

The speed of a motor is determined by the voltage and the torque by the current. If a motor is running at a certain speed with a constant torque and the load increases, the current will increase and so also the torque to maintain the same speed.

## How does voltage affect a DC motor?

Input Voltage: For a fixed load, the speed of the motor is affected by the applied voltage. Increase in voltage = increase in speed. Load Torque: For a fixed voltage, the speed of the motor is inversely affected by the load. Increase in load torque = decrease in speed.

## What controls the speed of a 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.

## Is voltage proportional to RPM?

Voltage is set by the supply. When spinning the motor generates an internal voltage called back-emf, which is proportional to rpm. The difference between the back-emf voltage and the supply voltage is dropped across the motor’s internal resistance (Rm), resulting in a current draw according to Ohm’s Law (I = V/R).

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

How to improve torque and RPM of a DC motor?

1. Case 1: Increase/Decrease strength of permanent magnets. What would happen to torque and RPM? …
2. Case 2: Increase/Decrease size of magnet wires. What would happen to torque, power consumption and RPM? …
3. Case 3: Increase/Decrease the size of armature. …
4. Case 4: Increase/Decrease the number of turns (coil).

## What is the output of a DC motor?

Typical DC motors may operate on as few as 1.5 Volts or up to 100 Volts or more. Roboticists often use motors that operate on 6, 12, or 24 volts because most robots are battery powered, and batteries are typically available with these values.

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## How do you slow down a 12 volt DC 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.

## Does current affect fan speed?

The speed may decrease (depending on motor type), but the current may increase to over 1 amp. So in this case, speed decreased while current increased. Typically yes since to move more air it must spin faster and at constant voltage power goes as current.

## What makes electric motor faster?

A faster motor. One easy way to make the motor run faster is to add another magnet. … 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.

## Is speed a voltage?

NO. voltage is not the speed of electricity. … these potential (the ELECTRICAL FORCE) pushes the charges ( electrons, the so called moving charges or changing electric field) and induced rotating magnetic fields in the wire and in turn generate electrical current.

## 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).

## What is torque equation of DC motor?

Torque or moment or moment of force is the tendency of a force to rotate or move an object about an axis. A force is a push or pull, likewise, torque is a twist to an object. Mathematically, torque, T = F × r.

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