Installation method for rotating electrical machine and installation structure for rotating electrical machine

An installation method for a rotating electrical machine that includes a rotor, a stator disposed so as to surround the rotor, and a casing configured to house the rotor and the stator, the method comprising:

• a placement step of placing a leg portion, which is disposed in the casing and has a first surface formed with a first groove portion extending along a first direction intersecting an axial direction of the rotor, on a support member, which has a second surface formed with a second groove portion extending along the first direction, the placement step including placing the leg portion on the support member such that a narrow groove portion having a smaller groove width of the first groove portion or the second groove portion falls within a range in a width direction of a wide groove portion having a larger groove width of the first groove portion or the second groove portion;
• a preparation step of preparing a key member which includes a narrow portion to be fitted into the narrow groove portion, and a wide portion having a one-side projecting portion projecting to one side in the width direction from the narrow portion and an another-side projecting portion projecting to another side in the width direction from the narrow portion;
• a length adjustment step of shortening at least either of the one-side projecting portion or the another-side projecting portion of the key member to be fitted into the wide groove portion, after the placement step;
• and
• a fitting step of fitting the key member into a key groove formed by the first groove portion and the second groove portion, after the length adjustment step,
• wherein the length adjustment step includes:
• a first measurement step of measuring a distance from an end face on the one side in the width direction of the wide groove portion to an end face on the one side in the width direction of the narrow groove portion in the key groove;
• a second measurement step of measuring a distance from an end face on the another side in the width direction of the wide groove portion to an end face on the another side in the width direction of the narrow groove portion in the key groove;
• and
• a cutting step of cutting at least either of the one-side projecting portion or the another-side projecting portion of the key member to be shortened according to measurement results of the first measurement step and the second measurement step.