# What determines the voltage of an electric motor?

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## Does voltage matter for motor?

Both high and low voltages can cause premature motor failure, as will voltage imbalance. … Thus, when voltage gets low, the current must increase to provide the same amount of power. An increase in current is a danger to the motor only if that current exceeds the motor’s nameplate current rating.

## Does more voltage mean more power in a motor?

As long as you can draw enough current (amps) from the battery, you can get the same amount of power out of many voltages. So theoretically, the higher voltage doesn’t mean more power in and of itself. Voltage numbers like 40V, 80V, and 120V often represent peak (max) volts.

## How does voltage affect electric motor?

The voltage is the only matter variable when running a motor. More voltage=More electromagnetic=more power=more torque. More current is not equal to more torque.

## How do you change the voltage on a motor?

Changing the operating voltage of a motor is just a matter of switching a few wires around on the motor’s terminal plate. By switching these wires, you change internal wiring for the run windings and the start windings from a parallel hook up for 115 volts to a series hook up for 230 volts.

## What is nominal voltage of a motor?

These terms are defined as follows: Nominal Voltage: The manufacturer-recommended voltage at which to operate the motor. Most DC motors come with a recommended range of voltages, but the nominal voltage is the voltage that the motor was built to operate at.

## What voltage do large motors use?

On motors larger than 10 HP the 200-volt motor is general- ly the best choice; but in many situations 230-volt motors are frequently and successfully applied on the 208-volt systems. In some cases a derate table is provided for the “low-voltage” situation.

## Why do we have to reduce the motor voltage of an induction motor?

When motor operates at lower V/Hz than rated, the magnetic flux is reduced. Reduced flux reduces the torque capability and affects the motor ability to handle the load. … Lower voltage while supply frequency is constant means lower V/Hz ratio and lower flux which affects the torque.

## What happens if you give a motor too much voltage?

The overvoltage can cause excessive current to flow as well as creating excessive voltage stresses. In both cases, the electrical insulation system inside the motor or equipment can be degraded reducing life or causing damage.

## How does low voltage affect Motors?

A low voltage forces a motor to draw extra current to deliver the power expected of it thus overheating the motor windings. The rule of thumb for motors is “for every 10 degrees C (50 degrees F) a motor is operated above its rated temperature, motor life will be decreased by 50%”.

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## Does voltage make a motor spin faster?

Since a 60Hz voltage supply switches polarity 20% faster than a 50Hz supply, a motor rated for 50Hz will spin at 20% higher rpm. Motor torque stays relatively constant, and a higher speed results in a higher shaft power. … To keep the V/Hz ratio constant, the input voltage should also be reduced to 83.3%.

## Is motor torque proportional to voltage?

In any motor, the basic principle is very simple: rotational speed is proportional to voltage applied. torque is proportional to current pulled.