What is Electric Motor ?

regenerative braking technologies under the BlueMotion brand in such models as the MK7 Golf and MK7 Golf Estate / Wagon models, other VW group brands like

SEAT, Skoda and Audi.[46]

Motorcycles

KTM racing boss Harald Bartol has revealed that the factory raced with a secret kinetic energy recovery system (KERS) fitted to Tommy Koyama's motorcycle during

the 2008 season-ending 125cc Valencian Grand Prix. This was against the rules, so they were banned from doing it afterwards.[47]

Regenerative braking is also possible on a non-electric bicycle. The EPA, working with students from the University of Michigan, developed the hydraulic Regenerative

Brake Launch Assist (RBLA).[48] It is naturally available on electric bicycles with direct-drive hub motors.

Races

A motor capacitor,[1][2] such as a start capacitor or run capacitor (including a dual run capacitor)[2] is an electrical capacitor that alters the current to one or more

windings of a single phase AC induction motor to create a rotating magnetic field. There are two common types of motor capacitors, run capacitors and start capacitors.

The units of capacitance are labeled in microfarads (µF). Older capacitors may be labeled with the obsolete terms "mfd" or "MFD" which can be ambiguous but are,

especially in this context, used for microfarad as well (a millifarad is 1000 microfarad and not usually seen on motors).

Motor capacitors are used with air conditioners, hot tub/jacuzzi spa pumps, powered gates, large fans or forced-air heat furnaces for example.[1][2] A "dual run

capacitor" is used in some air conditioner compressor units, to boost both the fan and compressor motors.[1]

Start capacitors briefly increase motor starting torque and allow a motor to be cycled on and off rapidly. A start capacitor stays

in the circuit long enough to rapidly bring the motor up to a predetermined speed, which is usually about 75% of the full speed

and is then taken out of the circuit, often by a centrifugal switch that releases at that speed. Afterward the motor works more

efficiently with a run capacitor.[1][3]

Start capacitors have ratings above 70 µF, with four major voltage classifications: 125 V, 165 V, 250 V, and 330 V. Examples of

motor capacitors are: a 35 µF, at 370 V, run capacitor, or an 88–108 µF at 250 V start capacitor.[1]

Start capacitors above 20 µF are always non-polarized aluminium electrolytic capacitors [4] with non solid electrolyte and

therefore they are only applicable for the short motor starting time.

The motor will not work properly if the centrifugal switch is broken. If the switch is always "open", the start capacitor is not part

of the circuit thus preventing startup of the motor. If the switch is always "closed", the start capacitor is always enabled, thus

likely destroying the capacitor. If a motor does not start, the capacitor is far more likely the problem than the switch.

Some single-phase AC electric motors require a "run capacitor" to energize the second-phase winding (auxiliary coil) to create a rotating magnetic field while the motor