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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 passin

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.

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1. 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 arou

1. 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. 2. A stator as claimed in claim 1, wherein said interpole compensation windings are so wound that one of them surrounds one of the side faces of an axially extending slot formed in the circumferentially middle portion of the radially inner end of said interpole core and the associated one of the circumferential side faces of said interpole core, and the other surrounds the other side face of said slot and the associated circumferential side face of said interpole core. 3. A stator as claimed in claim 1 or 2, wherein said interpole compensation windings are wound in in a manner so that the directions of magnetic flux produced by said compensation windings differ from each other. 4. A stator as claimed in claim 1, wherein the exciting current supplied to said interpole compensation windings is derived from the current supplied to said main pole winding. 5. A stator as claimed in claim 1 wherein the exciting current supplied to said interpole compensation windings is dereived from the current supplied to said interpole winding. 6. A stator as claimed in claim 1, wherein means are provided for controlling the exciting current supplied to said interpole compensation windings. 7. A stator as claimed in claim 6, wherein said controlling means controls the exciting current in accordance with the speed of rotation of said D.C. rotary machine. 8. 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. 9. A stator as claimed in claim 8, wherein each of said interpole compensation windings is so wound as to extend from an axially extending slot formed in the circumferentially middle portion of the radially inner end of said one interpole core to an axially extending slot similarly formed in the circumferentially middle portion of the radially inner end of said different interpole core adjacent thereto. 10. A stator as claimed in claim 8, wherein the exciting current supplied to said interpole compensation windings is derived from the current supplied to said main pole winding. 11. A stator as claimed in claim 8, wherein the exciting current supplied to said interpole compensation windings is derived from the current supplied to said interpole winding. 12. A stator as claimed in claim 8, wherein means are provided for controlling the exciting current supplied to said interpole compensation windings. 13. A stator as claimed in claim 12, wherein said controlling means controls the exciting current in accordance with the speed of rotation of said D.C. rotary machine. 14. A stator as claimed in claim 8, wherein each of said interpole cores is provided with two interpole compensation windings.