# What causes high current in a motor?

Contents

## What is the reason of motor taking high current?

Probable causes of high current with load include mechanical overload, excessively high magnetic flux densities and, less frequently, an open rotor. An error in winding data that results in lower-than-design-level magnetic flux also can cause high current with load.

## How do you reduce amps on a motor?

According to Ohms Law (I=E/R or Amps=Volts/Ohms) if the voltage in the circuit remains constant and the resistance is increased, the current should decrease. Try adding resistance to the circuit to lower the current output.

## When does a motor draws more current?

When they start, they draw six to ten times the amount of current used when they are operating at full load, but for a relatively short period of time. When the motor output shaft is connected to a load, the motor will draw as much current as is needed to get the load moving.

## How do I reduce amps?

Lowering amperage is done by applying Ohm’s law, given by the formula I = V/R, where I is the circuit’s total current in amperes, V is the voltage and R is the resistance. Add resistors to the circuit to increase the total resistance. A higher resistance results in a lower amperage.

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## What causes amperage to fluctuate?

Amp meters may fluctuate for several reasons. Improper loads on the circuit can cause the contacts in electrical components to heat or warp open. The process of the contacts warping open then closing when cooling can cause the system to turn on and off, causing the ammeter to fluctuate.

## How can you reduce current without changing voltage?

Reduce current voltage goes down. Limit current with a circuit breaker limited at a particular current eg: 10 Amps. Most loads limit their own current needs and this is covered by Ohm’s Law. A resistive load of 3000Watts at 230 Volts will draw 13.043 Amps.

## How inrush current is reduced in motor?

One is to use a soft starter — a device that gradually increases supply voltage to the motor terminals during startup, thus lowering inrush current and controlling startup torque. Similarly, a variable frequency drive reduces inrush current by controlling the voltage supplied to the motor.

## What happens if the amps are too high?

A higher voltage than a device is designed for will most likely blow up some components, but amperage is derived from how much current is actually drawn, based on the device’s resistance, so having “too much” is not a problem and will do no harm.

## How do you control current?

The current in a circuit is directly proportional to the electric potential difference impressed across the circuit and inversely proportional to the resistance of the circuit. Reducing the current can be done by reducing the voltage (choice A) or by increasing the resistance (choice D).

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## How do you restrict current?

Current limiting components

1. Fuse and Resistors. These are used for simple limiting of current. …
2. Circuit Breakers. Circuit breakers are used to cut off power just like the fuse, but their response is slower and might not effective for sensitive circuits.
3. Thermistors. …
4. Transistors and Diodes. …
5. Current limiting diodes.