Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Variable speed A.C. motor










Image Number 2 for United States Patent #4227136.

This invention is directed to a controllable infinitely variable speed A.C. electrical motor, comprising a rotor having a core of soft magnetic material carrying a peripheral layer of magnetizable permanent magnet material, which layer is magnetized by a stationary excitation coil energized with A.C. potential so that the peripheral layer assumes a selected configuration of north and south magnetic poles as the rotor revolves; A.C. potential is also applied to windings in slots in the stator core to provide a plurality of magnetic poles in the stator coacting magnetically with the configuration of north and south magnetic poles in the layer of magnetic material in the rotor, whereby to cause the rotor to revolve. Phase shifting means are provided in the circuit leading to the excitation coil to enable the phase of the A.C. current being supplied thereto to be shifted with respect to the phases of the A.C. current being supplied to the windings in the stator, and such phase shifting causes the rotor to speed up or slow down over a substantial range of speeds.








 
 
  Recently Added Patents
Micromachined devices and fabricating the same
Soybean cultivar CL0911610
Devices and methods for the production of coaxial microfibers and nanofibers
Method for forming contact hole
Automated synchronization of design features in disparate code components using type differencing
Personal IP toll-free number
Micro-fluidic device
  Randomly Featured Patents
Method of updating registered information in digital map
System and method for adjusting group delay
Filter for a wavelength division multiplex system
Communication system noise cancellation power signal calculation techniques
Method and apparatus for controlling record and reproduction of optical record medium
Managing packet-based voicemail messages
Carton
Obfuscation techniques for enhancing software security
Method of polycarbonate preparation
Enhanced bus arbiter utilizing variable priority and fairness