Speed-reducer-and-motor all-in-one machine

A speed-reducer-and-motor all-on-one machine comprising:

• a connection shaft comprising a first section, a second section and an accommodation space, wherein the first section and the second section are arranged in an axial direction, the accommodation space is in communication between a front end and a rear end of the connection shaft, an elliptical cam is formed on an outer surface of the second section of the connection shaft, and an outer diameter of the first section is greater than a major axis length of the elliptical cam, wherein the major axis length is measured along a major axis direction, from one point on an outer peripheral surface of the elliptical cam to an opposite point on the outer peripheral surface of the elliptical cam;
• a motor received within the accommodation space and connected to an inner surface of the first section, wherein the motor comprises an encoder fixed on the front end of the connection shaft and the inner surface of the first section of the connection shaft, and the encoder is configured to measure a rotational speed and an angle information of the connection shaft;
• and
• a speed reducer connected to the outer surface of the second section.