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The one… two.. three of electric motor design and key parts… from Shengzhou Tianyi …..

The Shengzhou Tianyi Electric Appliance Co Ltd was established in 1993 and is located in the industrial zone of Changle Town, Shengzhou City, the Centre of Zhejiang Province.

The business  operates a fully-equipped production and construction works,  with offices and testing centre, covering more than 16,000 sq metres, from where it manufactures a range of motor products for household appliances – washing machines; spin dryers; cooker hoods and blenders…. and more . It also develops and produces motors for fans; automotive accessories and air conditioning. The Company holds the ISO9001 and the 2008 Audit certifications. Its products all follow the CCC standard.

Tianyi Electric – a recent new member here on IMD online-  works with many famous household appliance ‘name’ brands, such as Samsung and Sharp and has growing exports of its products World-wide to Europe, The United States, The Middle East , India, Korea, Brazil, Indonesia .. and more… 

The Company principle of hi-tech development and quality technology is at the core of its statement of  business performance – “advance steadily, in refinement”….. here below the Company experts present some valuable basic information on key parts areas of their highly successful motor products….

Electric motor designs can vary quite a lot, though in general they have three main parts: a rotor, a stator and a commutator. These three parts use the attractive and repulsive forces of electromagnetism, causing the motor to spin continually as long as it receives a steady flow of electric current.

Basic Principles

Motors work through the principles of electromagnetism. If you run electricity through a wire, it creates a magnetic field. If you coil the wire around a rod and run electricity through the wire, it creates a magnetic field around the rod.

One end of the rod will have a north magnetic pole and the other will have a south pole. Opposite poles attract one another, like poles repel. When you surround that rod with other magnets, the rod will rotate from the attractive and repulsive forces.

The Stator

Every electric motor has two essential parts: one stationary, and one that rotates. The stationary part is the stator. Though configurations vary, the stator is most often a permanent magnet or row of magnets lining the edge of the motor casing, which is usually a round plastic drum.

The Rotor

Inserted into the stator is the rotor, usually consisting of copper wire wound into a coil around an axle. When electric current flows through the coil, the resulting magnetic field pushes against the field created by the stator, and makes the axle spin.

The Commutator: Basics

An electric motor has another important component, the commutator, which sits at one end of the coil. It is a metal ring divided into two halves. It reverses the electrical current in the coil each time the coil rotates half a turn. The commutator periodically reverses the current between the rotor and the external circuit, or the battery. This ensures that the ends of coils do not move in opposite directions, and ensures that the axle spins in one direction.

More Commutator: Magnetic Poles

The commutator is necessary because the spinning rotor gets its motion from magnetic attraction and repulsion between the rotor and the stator. To understand this, imagine the motor turning in slow motion. When the rotor rotates to the point where the south pole of the rotor magnet meets the north pole of the stator, the attraction between the two poles will halt the spin in its tracks. 

To keep the rotor spinning, the commutator reverses the magnet’s polarity, so the rotor’s south pole becomes the north. The north pole of the rotor and the north pole of the stator then repel each other, forcing the rotor to continue to spin.Washing Machine AC Motor manufacture

Brushes and Terminals

At one end of the motor are the brushes and the terminals. They are at the opposite end from where the rotor exits the motor casing. The brushes send electrical current to the commutator and are typically made of graphite. The terminals are the locations where the battery attaches to the motor and sends the current to spin the rotor.