1. According to the classification of motors, there are mainly the following categories.
(l) AC (including brake) motors: there are three-phase AC motors (12OW-30kw) and single-phase AC motors (IW-1o2w).
(2) DC (including brake) motors: there are electromagnetic (a few watts to tens of kilowatts) and permanent magnet (a few watts to several kilowatts) DC motors.
(3) AC (direct) current servo motor.
(4) Various control motors and special motors.
2. According to the gearbox transmission mode, there are mainly the following categories.
(l) Gear transmission: including helical gears, worm gears, bevel (bevel) gears, and planetary gears. Gear transmission is the most classic transmission, single-stage transmission efficiency is as high as 98%, simple structure, high reliability, long life (design life of 20 years), large power range (up to 30kw).
(2) Cycloid pin wheel: Using the principle of planetary transmission, the cycloidal wheel meshes with the pin wheel, which realizes the simultaneous meshing transmission of multiple teeth and avoids the possibility of tooth breakage. It has compact structure, small size, large transmission ratio, the first-stage speed ratio can reach 1:119, and the average efficiency of single-stage transmission can reach more than 90%.
(3) Harmonic transmission: the mechanical wave is generated by the harmonic generator, and then through the deformation of the flexible gear, the relative displacement between the teeth is generated to achieve the transmission purpose. The advantages are that the single-stage transmission ratio can reach 1:50, the number of meshing teeth is large, the carrying capacity is high, the volume is small, and the weight is light. The single-stage transmission efficiency can reach 90% to 90%. However, the flexspline is made of a thin-walled structure and works under repeated deformation, which requires higher heat treatment. Generally used for medium and small power transmission, the motor power is below 10kw.