Compound AC generator

• US 4,004,211 A
• Filed: 02/03/1976
• Issued: 01/18/1977
• Est. Priority Date: 02/10/1975
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Takao, Masaki, Tatsumi, Hideo
• Primary Examiner(s): Hickey, Robert J.
• Application Number:
  US05/654,908
• Time in Patent Office: 350 Days
• Field of Search: 322/59, 322/62, 322/63-66, 310/184-188, 320/65
• US Class Current: 322/63
• CPC Class Codes: H02P 9/38 Self-excitation by current derived from rectification of both output voltage and output current of generator

Abstract

In a compound AC generator having at least one pair of magnetic poles, series field windings wound on the magnetic poles, respectively, and at least one shunt field winding wound on at least one of the pair of magnetic poles in layers with the series field winding wound thereon, the series field winding wound in layers with the shunt field winding is associated with means for blocking the current flow through the series field winding in a direction to increase the magnetic fluxes through the associated magnetic pole thereby to minimize the effects of pulsating field current through the shunt field winding and to stabilize the output of the generator.

Claims

1. In a compound AC generator comprising at least one pair of magnetic poles, series field windings wound on said magnetic poles, respectively, circuit means for connecting said series field windings in parallel to permit a load current of said generator to branch into parallel flowing paths therethrough, and a shunt field winding wound on at least one of said magnetic poles and in layers with the series field winding wound thereon, the improvement which comprises current block means provided in said circuit means so as to block the current flow through any one of said series field windings in a direction to increase the magnetic flux in said one series field winding due to a voltage induced into the other series field winding when a pulsating voltage is developed in the shunt field winding in layers with said other series field winding.

2. The improvement according to claim 1, wherein said current block means includes a diode connected in series with said other series field winding.

3. The improvement according to claim 1, wherein said blocking means includes a diode bridge circuit connected in series with said other series field winding.