# What law do electric motors work?

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Since you are familiar with Newton’s third law of motion, you know that if the magnetic field exerts a force on the current carrying wire, then the current carrying wire also exerts a force of equal magnitude and opposite direction on the magnetic field.

## Which law is used for motor?

Faraday’s law of induction is the fundamental law on which electric motors operate. Michael Faraday is credited with discovering induction in 1831, but James Clerk Maxwell described it mathematically and used it as the foundation of his quantitative electromagnetic theory in the 1860s.

## Which law is used for DC motors?

The DC motor is the device which converts the direct current into the mechanical work. It works on the principle of Lorentz Law, which states that “the current-carrying conductor placed in a magnetic and electric field experience a force”. The experienced force is called the Lorentz force.

## What is the operating principle of electric motor?

Electric motors operate on three different physical principles: magnetism, electrostatics and piezoelectricity. In magnetic motors, magnetic fields are formed in both the rotor and the stator. The product between these two fields gives rise to a force, and thus a torque on the motor shaft.

## What are the laws that support electromagnetic force?

There are four laws of electromagnetism: • The law of Biot-Savart magnetic field generated by currents in wires • Ampere’s law the effect of a current on a loop of flux which it threads • Force law the force on an electron moving through a magnetic field • Faraday’s law the voltage induced in a circuit by magnetic flux …

## What is the fundamental motor equation?

In the case of a generator, the emf of rotation is called the Generated emf or Armature emf and is denoted as Er = Eg. … In the case of a motor, the emf of rotation is known as Back emf or Counter emf and represented as Er = Eb.

## 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.

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## What are the advantages of DC motor?

Below are some advantages of DC motors that you should consider:

• Good speed control. DC motors offer highly controllable speed. …
• High torque. …
• Seamless operation. …
• Free from harmonics.

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## Why a starter is necessary for DC motor?

Starters are used to protect DC motors from damage that can be caused by very high current and torque during startup. They do this by providing external resistance to the motor, which is connected in series to the motor’s armature winding and restricts the current to an acceptable level.

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## What are the 6 parts of an electric motor?

These six components include:

• 1) The Rotor. The rotor is the moving part of your electric motor. …
• 3) The Bearings. The rotor in your electric motor is supported by bearings, which allow it to turn on its axis. …
• 4) The Windings. …
• 5) The Air Gap. …
• 6) The Commutator. …
• What Do All of These Components Have in Common?

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## What is the role of commutator in electric motor?

The commutator assures that the current from the generator always flows in one direction. … On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.

## What is Faraday’s Law equation?

Faraday’s law of induction is a basic law of electromagnetism that predicts how a magnetic field will interact with an electric circuit to produce an electromotive force (EMF). … EMF=−NΔΦΔt EMF = − N Δ Φ Δ t . This relationship is known as Faraday’s law of induction. The units for EMF are volts, as is usual.

## What does Faraday’s law state?

It states that the induced voltage in a circuit is proportional to the rate of change over time of the magnetic flux through that circuit. In other words, the faster the magnetic field changes, the greater will be the voltage in the circuit.

## What is Faraday’s first law?

First law. Michael Faraday reported that the mass( ) of elements deposited at an electrode is directly proportional to the charge ( in ampere seconds or coulombs).

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