The reducer can reduce the moment of inertia, generally the square of the speed ratio, which is very important for control, and can control the start and stop and speed change in time. Through the reducer to increase the torque is equivalent to increasing the input power, can reduce the power required by the input motor (in the need for speed regulation), in general, the motor is more expensive than the reducer, so consider using the reducer.
The reducer has the role of protecting the motor in the transmission, the reducer bears the larger torque during operation, and the overload is transmitted to the motor only by the excess load divided by the reduction ratio, which may cause damage to the motor if borne directly by the motor. When the overload is very large, the deceleration opportunity will be damaged first, and the reducer only needs to replace the spare parts can be restored to use, the cost is relatively low, and if the motor is directly damaged and the maintenance is relatively slow, the cost is high.
When the motor is directly connected to the load at low speed, the motor will inevitably increase a lot in order to meet the output torque current, which will inevitably have higher requirements for the heat dissipation and insulation of the motor, and it is not desirable from the point of view of energy saving, if you use the reducer, you can reduce the impact of these problems.