First of all, the motivation part
The function of the power part is to convert other forms of energy into mechanical energy (for example, the internal combustion engine and the motor convert thermal energy and electrical energy into mechanical energy respectively). The prime mover is the power source to drive the whole machine to complete the predetermined function.
Second, the work part.
Its function is to use mechanical energy to convert or transmit energy, materials and signals. For example, a generator converts mechanical energy into electrical energy, and a rolling mill converts the shape of materials.
Third, the transmission part.
Its function is to transform the motion form, motion and power parameters of the prime mover into the motion form, motion and power parameters required by the working part.
Main characteristics of extended data
Machinery is a combination of artificial physical parts.
There is definite relative motion between all parts of the machine.
In addition to the characteristics of mechanism, a machine must also have a third characteristic, that is, a mechanism that can replace human labor to complete useful work or convert mechanical energy, so the machine can convert mechanical energy or complete useful work. From the point of view of structure and movement, there is no difference between mechanism and machine, which is generally called machinery.
References:
Baidu encyclopedia-machinery