• Product Name
  • Product Keyword
  • Product Model
  • Product Summary
  • Product Description
  • Multi Field Search

GET THE LATEST INFORMATION

 NEWS
Shaded pole motor
Home » News » Motor knowledge » Shaded pole motor

Shaded pole motor

Views:5     Author:Site Editor     Publish Time: 2018-08-21      Origin:Site

The shaded-pole motor is the original type of AC single-phase induction motor, dating back to at least as early as 1890. A shaded-pole motor is a small squirrel-cage motor in which the auxiliary winding is composed of a copper ring or bar surrounding a portion of each pole. This auxiliary single-turn winding is called a shading coil. Currents induced in this coil by the magnetic field create a second electrical phase by delaying the phase of magnetic flux change for that pole (a shaded pole) enough to provide a 2-phase rotating magnetic field. The direction of rotation is from the unshaded side to the shaded (ring) side of the pole.[2] Since the phase angle between the shaded and unshaded sections is small, shaded-pole motors produce only a small starting torque relative to torque at full speed. Shaded-pole motors of the asymmetrical type shown are only reversible by disassembly and flipping over the stator, though some similar looking motors have small, switch-shortable auxiliary windings of thin wire instead of thick copper bars and can reverse electrically. Another method of electrical reversing involves four coils (two pairs of identical coils).[3]

The common, asymmetrical form of these motors (pictured) has only one winding, with no capacitor or starting windings/starting switch, making them economical and reliable. Larger and more modern types may have multiple physical windings, though electrically only one, and a capacitor may be used. Because their starting torque is low, they are best suited to driving fans or other loads that are easily started. They may have multiple taps near one electrical end of the winding, which provides variable speed and power by selection of one tap at a time, as in ceiling fans. Moreover, they are compatible with TRIAC-based variable-speed controls, which often are used with fans. They are built in power sizes up to about 14 horsepower (190 W) output. Above 13 horsepower (250 W), they are not common, and for larger motors, other designs offer better characteristics.


Find Us

  China office
Contact Person:
 James xiao 
Phone: 0086-13808637315
E-mail:sales7@hkritscher.com / admin@hkritscher.com
Skype: whzggm 
QQ:1093989381
   Australia Branch 
Contact Person:Michael Roger Burzacott
Tel:+61 417 654 723
E-mailmrburzacott@adam.com.au 
Skype: roger.burzacott
Copyright © 2016 RITSCHER INTERNATIONAL LIMITED  All right resolved.
Site Map    Supported by Leadong