US 4,451,752 AGranted

Stator of D.C. rotary machine

AssigneeHitachi, Ltd.

InventorsKazuo Tahara, Takayuki Matsui, Haruo Koharagi, Seizi Yamashita, Noriyoshi Takahashi

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Abstract

In a stator provided with interpoles, a magnetic flux adjusting winding is provided adjacent to the radially inner end of each interpole core for adjusting the magnetic flux passing through the half of the circumferential width of the interpole core, so that the intensity of the magnetic flux passing through the radially inner end of the interpole core becomes substantially uniform along the end face of the interpole core, whereby the waveform of the commutating emf is simulated to that of the reactance voltage to widen the width of the no-spark zone during commutation thereby improving the commutation performance without appreciably modifying the original shape or structure of the stator.

Claims14

Dependent claims

A stator of a D.C. rotary machine comprising an annular yoke, a plurality of main pole cores disposed along the inner periphery of said yoke in a relation equally spaced apart by a predetermined distance from each other in the circumferential direction of said yoke, a main pole winding wound around each of said main pole cores, a plurality of interpole cores disposed also along the inner periphery of said yoke at positions intermediate between said circumferentially spaced main pole cores, and an interpole winding wound around each of said interpole cores, wherein magnetic flux adjusting means is provided adjacent to the radially inner end of each of said interpole cores for adjusting the magnetic flux passing through the half of the circumferential width of said interpole core, said magnetic flux adjusting means being formed by disposing interpole compensation windings circumferentially respectively biased toward the opposite sides of said interpole core relative to the circumferential center of said interpole core, each of said interpole compensation windings being supplied with an exciting current in a manner so that the intensity of the magnetic flux passing through the radially inner end of said interpole cores is substantially uniform along the end face of said interpole cores.

A stator of a D.C. rotary machine comprising an annular yoke, a plurality of main pole cores disposed along the inner periphery of said yoke in a relation equally spaced apart by a predetermined distance from each other in the circumferential direction of said yoke, a main pole winding wound around each of said main pole cores, a plurality of interpole cores disposed along along the inner periphery of said yoke at positions intermediate between said circumferentially spaced main pole cores, and an interpole winding wound around each of said interpole cores, wherein magnetic flux adjusting means is provided adjacent to the radially inner end of each of said interpole cores for adjusting the magnetic flux passing through the half of circumferential width of said interpole core, said magnetic flux adjusting means including interpole compensation windings, each of said interpole compensation windings being disposed across one of said interpole cores and a different interpole core opposite in polarity to said one interpole core, each of said interpole compensation windings being supplied with an exciting current so that the intensity of the magnetic flux passing through a radially inner end of said interpole cores is substantially uniform along the end face of said interpole cores.

Dependencies are inferred from the claim text.