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Self Starting Synchronous Motor

IP.com Disclosure Number: IPCOM000094445D
Original Publication Date: 1965-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Arnold, HI: AUTHOR

Abstract

Synchronous motors occasionally fail to start when AC is applied to the field coil. This occurs when rotor 10 resides in such a position that the magnetic flux generated by AC applied to the field coil and existing between the two sets of stator poles 11 and 12 is balanced with respect to the permanent magnetic poles of rotor 10.

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Self Starting Synchronous Motor

Synchronous motors occasionally fail to start when AC is applied to the field coil. This occurs when rotor 10 resides in such a position that the magnetic flux generated by AC applied to the field coil and existing between the two sets of stator poles 11 and 12 is balanced with respect to the permanent magnetic poles of rotor 10.

Positive starting upon application of power is assured by the inclusion of torquing reed elements 13. Elements 13 comprise radially extending spring steel shafts anchored to rotor 10 between opposite magnetic poles. The shafts have magnetically excitable head portions 14. These respond to the alternating stator flux to vibrate the reeds. This vibration produces sufficient torque to move rotor 10 from the balanced condition to a positive starting position.

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