Everything about AC and DC Motors

AC motor is an abbreviation for Alternating Current motors invented by Nicola Tesla to transform energy from electrical into mechanical type just like DC motors (Directional Current motor).
AC motors may be found in fans, hairdryers, clocks, washing machines, and many other applicants providing services in offices, factories, businesses, etc.

The two main types of AC motors are induction motor and synchronous motors. The induction motor (or asynchronous motor) always relies on a small difference in speed between the stator rotating magnetic field and the rotor shaft speed called slip to induce rotor current in the rotor AC winding. As a result, the induction motor cannot produce torque near synchronous speed where induction (or slip) is irrelevant or ceases to exist. In contrast, the synchronous motor does not rely on slip-induction for operation and uses either permanent magnets, salient poles (having projecting magnetic poles), or an independently excited rotor winding. The synchronous motor produces its rated torque at exactly synchronous speed. The brushless wound-rotor doubly fed synchronous motor system has an independently excited rotor winding that does not rely on the principles of slip-induction of current. The brushless wound-rotor doubly fed motor is a synchronous motor that can function exactly at the supply frequency or sub to super multiple of the supply frequency.

Other types of motors include eddy current motors, and AC and DC mechanically commutated machines in which speed is dependent on voltage and winding connection. see more

DC Motors

A DC motor is any of a class of rotary electrical motors that converts direct current electrical energy into mechanical energy. The most common types rely on the forces produced by magnetic fields. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current in part of the motor.

Some of the most popular designs for DC motors are Permanent magnet, Brushless, Shunt, Series, and Compound wound or stabilized shunt. The DC motor parts are normally the same within these different designs and the overall operation is similar. How it operates is that a conductor, carrying the current is implanted in a magnetic field, and the power applied through the conductors enable the rotation of the motor. The generation of electromagnetic fields and its place, whether it be in the rotor or stator, is the reason these designs differ from each other.click here

The difference between AC and DC generators: Use and Maintenance

The output voltage produced by AC generators is called alternators. The normal frequency of alternators is 60Hz for America, Europe, and Japan. This output voltage differs in time and amplitude. DC generators produce a steady output voltage, suitable to power large motors. While DC generators are mainly used to supply power for large motors, AC generators are used for smaller ones. You can power your electrical appliances at home with the help of AC like food mixers, electrical fixtures, etc.

As the world’s leading provider of large motors, Siemens Norwood, OH AboveNEMA motor facility is celebrating over 120 Years with global service and support that includes over 100 patents. Siemens offers a complete line of large AC 3-phase induction motors from its ISO-9001 Certified plant. Motors range from horizontal AC induction motors up to 22,000 horsepower and voltage ranges from 460 to 13,200 volts – to large AC vertical motors up to 8,000 HP.

more information

DC Genertor

Parts of dc generator can be said to play a significant role within such kind of generator. Like any machine, a dc generator consists of different parts. It is an electrical instrument that transforms mechanical energy into electricity. The working principle, different types as well as pros and cons will be discussed next to parts of dc generator in detail, at Linquip.

If external mechanical power is applied to a DC motor it acts as a DC generator, a dynamo. This feature is used to slow down and recharge batteries on hybrid and electric cars or to return electricity back to the electric grid used on a street car or electric powered train line when they slow down. This process is called regenerative braking on hybrid and electric cars. In diesel electric locomotives they also use their DC motors as generators to slow down but dissipate the energy in resistor stacks. Newer designs are adding large battery packs to recapture some of this energy.

more information in : https://www.linquip.com/blog/parts-of-dc-generator-explanation-working/