Stator of rotating electric machine and structure thereof
View Patent ↗In a stator core support structure in a conventional rotating electric machine, it has been difficult to set the circumferential and radial stiffnesses with which elastic bars support a stator core, to appropriate values in view of a relationship between transmission of torque and vibration prevention. In order to solve the above problem, sectional shape of elastic support bars is formed as rectangular, elliptic, rhombic or the like, and accordingly, the ratio between circumferential and radial stiffness of the elastic support bars can be changed.
1. A support structure as vibration prevention to join a stator core to a stator frame in the rotating electric machine, comprising:
a first ring-like support plate attached to an outer peripheral side of the stator core;
a second ring-like support plate attached to an inner peripheral side of the stator frame;
a third ring-like support plate attached to one of the outer peripheral side of the stator core and the inner peripheral side of the stator frame, and
support bars extending through the first ring-like support plate, the second ring-like support plate and the third ring-like support plate so as to join the stator core and the stator frame,
wherein:
each of the support bars has a circular sectional shape at a portion where the support bars extend through the third ring-like support plate, and the sectional shape is selected from one of elliptic or rhombic at portions where the support bars extend through the first and second ring-like support plates, so that stiffness in the circumferential direction of the stator core is greater than that in the radial direction, and
the circular sectional shape of each support bar has a diameter smaller than the hole of the third ring-like support plate to restrain the support bars from excessive deformation in an arbitrary radial direction thereof.
2. The support structure according to claim 1 , wherein each of the support bars has a sleeve whose outer shape constitutes said circular sectional shape of the support bars and including grooves to prevent fretting failure around the holes into which the support bars are fitted.
3. The support structure according to claim 1 , wherein outer periphery parts between holes bored in the first ring-like support plate attached to outer surface of the stator core and inner periphery parts between holes bored in the second ring-like support plate attached to inner surface of the stator frame are cut off the stator core is rotated until the cutoff parts and the holes become aligned so as to facilitate insertion of the stator core into the stator frame.