Your cart is empty

Shop

Quantity: 0

Total: 0,00

0

DC motor

DC motor

DC motors consist of a permanent magnet and a coil within the magnet, with electric current flowing in it.

Physics

Keywords

electric motor, engine, elektromotor, magnet, coil, commutator, brush, current, magnetism, pole, electromagnet, permanent magnet, iron core, energy, electric, rotating, electricity, electro, electron, physics, machine

Related items

Scenes

Motor

A DC motor is a simple electric motor, powered by direct current.

Its main components are the rotor (rotary part) and the stator (stationary part). The stator is a permanent magnet, which surrounds the rotor. The rotor consists of at least one coil that is wound around an iron core (that is, an electromagnet).

When electric current is supplied to the metal coil, a magnetic field is generated around it. Therefore the coil will function as a magnet: it will turn in order to align itself with the permanent magnetic field of the stator. However, once it reaches a stable position, the commutator switches the direction of the electric current. This causes the rotor to continue to turn in search of the stable position. It will continue to rotate as long as the motor receives a supply of electric current.

The coil receives its power supply via the ring segments of the turning commutator, which, in turn, receives power supply via the brushes. The brushes are usually made of carbon, since as they wear out, the microscopic carbon dust particles are easily expelled from the rotating motor. If the brushes were made of metal, the metal particles would be deposited on the commutator, causing a short-circuit. When we see sparks in an operating electric motor, they are formed at the brushes.

Electric motors that consist of a single coil have a position from which they cannot restart. More complex DC motors, therefore, contain more than one coil, so their operation is continuous and they can always start. In these, the commutator consists of not two, but several ring segments. There are also DC motors in which the stator is an electromagnet too.

Construction

  • magnet
  • coil - When electric current is fed into a metal coil, a magnetic field is generated around the coil, that is, it will function as a magnet: it will turn in order to align itself with the permanent magnetic field of the stator.
  • commutator - The commutator rotates together with the rotor of the DC motor. It receives electric current from the brushes and transmits it to the coil(s) of the rotor. In the simplest DC motor there are two poles, therefore the commutator consists of two segments. As the commutator rotates, the poles of the electric current are switched every 180°.
  • brush - Electric current flows through the brush onto the commutator, then to the coil. It is usually made of carbon.
  • iron core - The function of the iron core is to strengthen the magnetic field that is created by the coil.
  • insulation

Related items

Alkaline batteries

In alkaline batteries electric current is generated by electrochemical reactions

Dynamo (intermediate)

A dynamo converts mechanical energy into direct current.

Electric bell

Mechanical bell that functions by means of an electromagnet.

Generating alternating current

Electric current can be generated by rotating an armature loop in a magnetic field.

How does it work? - Loudspeaker

In loudspeakers sound waves are generated by electromagnetic induction.

How does it work? - Record player

This animation demonstrates the mechanism and operation of record players.

Capacitors

Capacitors store electrical energy in the form of electric charge.

Diesel engine

The German engineer Rudolf Diesel patented the diesel engine in 1893.

Edison’s light bulb

The American electrical engineer Edison invented the incandescent light bulb in 1879, which changed our everyday life.

Electric motors

Electric motors are present in many areas of our everyday lives. Let's learn about the different types.

Four-stroke Otto engine

This animation demonstrates the type of engine most commonly used in cars.

Generators and electric motors

While generators convert mechanical energy into electrical energy, electric motors convert electrical energy into mechanical energy.

How does it work? - Hair dryer

This animation demonstrates the structure and operation of hair dryers.

How does it work? - Radio

This animation demonstrates how radios work.

Nikola Tesla's laboratory (Shoreham, USA)

This physicist-inventor and electrical engineer who mainly dealt with electrotechnics was undoubtedly one of the most brilliant figures of the second...

Torsion balances

A force can be measured by measuring the twisting of the torsion wire in a torsion balance.

Transformer

A transformer is a device used for converting the voltage of electric current.

Two-stroke engine

A two-stroke engine is a type of internal combustion engine with a cycle of only two (power) strokes.

Dynamo (basic)

A dynamo converts mechanical energy into direct current.

Lead-acid battery

Electrochemical processes in a lead-acid battery produce electric current.

Added to your cart.