Electrical rotating machine

1. An electrical rotating machine provided with a salient-pole rotor composed of magnetic field pole bodies integrally formed with a shaft and pole shoes constituting magnetic field pole heads, each pole shoe being fixedly joined on the corresponding one of the magnetic field pole bodies with a plurality of bolts, wherein:

each pole shoe or its corresponding magnetic field pole body is provided with at least one protrusion or recess for restricting a conically-shaped compression domain in a compression domain that occurs in the pole shoe when the pole shoe is joined on the corresponding magnetic field pole body with the bolts,

each pole shoe is provided, on the lower wall thereof on sides of opposite ends in a longitudinal direction thereof, with rectangular protrusions, respectively, which are of the same shape and size and each define at least one through-hole for the corresponding one of the bolts,

each rectangular protrusion has, in the longitudinal direction of the pole shoe, a dimension that allows corresponding two or more of the bolts to extend therethrough, and

each rectangular protrusion is in a stepped shape of a height dimension that decreases stepwise with an increasing distance from the corresponding end of the pole shoe in the longitudinal direction.

2. The electrical rotating machine according to claim 1 , wherein:

the plurality of bolts are aligned in at least two parallel rows and along a central axis of the shaft, and

the recess is formed at an intermediate part between adjacent two ones of the at least two parallel rows of bolts.

3. The electrical rotating machine according to claim 1 , wherein:

the plurality of bolts are aligned in at least one row and along a central axis of the shaft,

the recess is formed at an intermediate part between the row of bolts and one of widthwise opposite sides of the pole shoe.