The speed and torque measurement is implemented without direct contact by a Hall effect sensor counting the frequency of the rotating magnetic field.
22.
In April 1888 Westinghouse engineer Oliver B . Shallenberger developed an polyphase brushless AC induction motor, also based on a rotating magnetic field.
23.
They were able to overcome the problem of starting up the AC motor by using a rotating magnetic field produced by a poly-phase current.
24.
Jupiter's strong, rapidly rotating magnetic field ( light blue lines in the figure ) generates strong electric fields in the space around the planet.
25.
The Colorado team's technique to solve the problem _ a rotating magnetic field _ worked reasonably well, but could not completely confine the atoms.
26.
In 1824, the French physicist Fran�ois Arago formulated the existence of rotating magnetic fields using a rotating copper disk and a needle, termed Arago's rotations.
27.
The result of such an arrangement is a rotating magnetic field that is used to convert electrical power to rotary mechanical work, or vice versa.
28.
Commercial size generators have a rotor carrying a field winding so that a rotating magnetic field is produced inside a set of windings called the stator.
29.
Because magnets degrade with time, induction motors use short-circuited rotors ( instead of a magnet ) which follow the rotating magnetic field of a multicoiled stator.
30.
A rotating magnetic field of steady amplitude requires that all three phase currents be equal in magnitude, and accurately displaced one-third of a cycle in phase.
