Motor installation structure of refrigeration compressor

The invention discloses a motor installation structure of a refrigeration compressor, which comprises a crankcase, a crankshaft, a connecting rod, a piston pin, a piston, a valve group, a motor stator, a motor rotor, a rotor installation bushing, a support spring and a shell body; the rotor installation bushing is fixedly connected with the crankshaft; an enough installation and matching length is left between the inner hole of the rotor installation bushing and the excircle of the crankshaft; the motor rotor is fixedly connected with the rotor installation bushing; and the enough installation and matching length is left between the inner hole of the motor rotor and the excircle of the rotor installation bushing. When the refrigeration compressor applies a thin-type motor, the enough installation and matching length is realized, so that the motor installation reliability is ensured.