1. ELECTROSTATIC MOTOR BY
V VINAY
10EEE102

2. Introduction
Principle
Construction
Working
Applications

3. Introduction It was invented in 1748 by Benjamin Franklin.
Also called Capacitor motor.
Electrostatic motors are the dual of conventional coil- based motors.

4. Why we go for this?
The field exists in the atmosphere between the earth's surface and the ionosphere as an electric potential of about 360,000 volts.
The earth's field provides relatively low direct current at high voltage, which is ideal for operating electrostatic motors.
The energy of the field can be tapped with a simple antenna in the form of a vertical wire that carries one sharp point or more at its upper end.

5. Principle
Based on Coulomb forces(like charges repel, unlike ones attract).
Energy output is related to the change in electrostatic energy that occurs when charges are moved between the terminals of a high-voltage (HV) supply .

6. Construction
Rotor
Stator
Bearings
HV circuit

7. Electrostatic motor

8. Parts of electrostatic motor
Rotor bottle
Paper clip
Stator panels

9. Bearings

10. HV circuit

11. Working
 It draws a fraction of a micro amp during operation, and can run at unexpectedly high speeds It runs on a minimum of volts DC, which can be had from several different low- current electrostatic energy sources.
Any of the following can power this motor:
Van de Graff electrostatic generator
Wimshurst electrostatic generator
Negative ion generator, it runs off a 9v battery
Aluminum foil on a TV screen
M. Foster's Cheap High Voltage
Lenny R's PVC Pipe generator
A very large electrophorus 

12. "Kelvin's Thunderstorm" water drop machine
High-voltage DC supply
Jefimenko-style sky antenna (kite-lifted or balloon-lifted wire with needles at top)
Or, with some practice, even with a balloon and a piece of fur can sometimes work.

13. High voltage is applied between the two stator panels.
Tiny spark jumps from the tip of each commutator brush to one of the foil sectors on the rotor .
 Sideway electrostatic force causes the rotor to rotate, which brings new foil sectors under the brushes.

14. The foil on the rotor that's under the commutator is always charged the same as the commutator, so it's always being repelled/attracted sideways. 
The force is continuous, therefore the speed of the rotor will keep rising higher and higher.
In practice the rotor speed will not increase forever, but will stabilize because of air turbulence, bearing resistance and bearing chatter, etc.

15. Applications
Which are far simpler to build than electromagnetic ones, may find applications in special environments such as those from which magnetism must be excluded or in providing low power to apparatus at remote, unmanned stations by tapping the earth's field. 
Frequent use in micro-mechanical (MEMS) systems where their drive voltages are below 100 volts, and where moving, charged plates are far easier to fabricate than coils and iron cores.

16. Application Scanning Electron Micrograph (SEM) image of a salient-pole
Electrostatically actuated micromotor
made from polycrystalline silicon using
surface Micromachining techniques.
The central rotating element of the
motor (e.g., the held to the substrate
by the central bearing (which is shown
in red).

17. Properly phased voltage potentials are placed on the motor stators (typically 120 degrees advanced in phase sequentially around the stators), which are equally spaced around the perimeter of the rotor (also shown in blue) and these applied voltages on the stators cause the central rotor to turn around the bearing at extremely high angular velocities. This device was made through the MEMS and Nanotechnology Exchange fabrication network.

18. THANK YOU