Vertical geared motors are geared motors with fixed speed. Once the speed ratio is selected, the motor is selected, and the final output speed is fixed. However, in actual use, there are many occasions where the speed is required to be changed, such as the spindle speed of a lathe, the speed of the mixing shaft of various agitators, and the speed of a conveyor when conveying different items. topic. Various speed regulation methods applied in engineering are briefly described below.

　　1. Step-by-step speed regulation is the simplest and most economical speed regulation method. However, it is only limited to small and medium capacity (less than 2kw) and occasions with few starting times. Usually only two speeds can be achieved, and the speed ratio that can be achieved is also small (l: 2-6), and the limit is three speeds.In certain industries, such as lathes, gearboxes with gears are often used. Stepped speed regulation. Although there are child speeds, the speed range is not large.

　　2. Stepless speed regulation can be divided into mechanical and electrical. The former common method is to insert a mechanical stepless speed regulating device (mainly a belt disc type and a friction disc type) at the joint of the motor and the gear box. The advantage is that the speed is stable, the structure is not complicated, and it is suitable for harsh environments. The disadvantage is that the speed range is small (usually within 1:10). The basin belt and the friction disc are consumable parts and need to be regularly replaced. The latter is cascade speed regulation for asynchronous motors, rotor resistance speed regulation, or DC motor speed regulation.