Motor spacer, motor spacer applied to variable-speed compressor and compressor

A compressor, comprising:

• a shell, at least one portion of which is a cylindrical portion;
• a substantially hermetic space defined by the shell;
• a motor mounted onto an inner side of the cylindrical portion of the shell, the motor comprising a stator;
• and
• a motor spacer coaxially mounted around the stator and mounted onto an inner side of the shell by a clamping force, the motor spacer including a ring member, coaxially mounted around the stator by a first clamping force;
• a plurality of support blocks, wherein each support block protrudes radially and outwardly from the ring member and has a hollow frame structure with a closed enclosure, and wherein each support block has a support surface in contact with the shell, and wherein the support surface is located on a side of an imaginary ring cylinder having a common axis with the ring member, and wherein the plurality of the support blocks are adapted to mount the motor spacer onto an inner side of the shell by a second clamping force;
• and
• a reinforcing rib extending across said hollow frame structure of said support block, and a through hole provided at a center of each of said support blocks, and extending through said reinforcing rib.