How to choose the motor model of WHC120-40-3 worm gear reducer

The key to selecting the motor model of the reducer is to match the rated input power, speed and installation conditions of the reducer. The specific steps and Selection suggestions are as follows:

1. Clarify the core matching parameters of the reducer

1. Rated input power: The rated input power of WHC120-40-3 is about 7.5KW (corresponding to an output torque of about 1200N.m). The motor power must be ≤ this value to avoid overload damage to the reducer.

2. Adaptable speed: The recommended input speed of the worm gear reducer is 1450r/min (conventional 4-pole motor speed). When paired with a speed ratio of 40, the output speed is about 36r/min, which meets the needs of most medium and low-speed working conditions.

3. Installation interface: Confirm the input shaft diameter of the reducer (normally 18-22mm) and keyway size, and the motor output shaft needs to match it, or adapt it through a coupling.

2. Core points of motor models Selection

1. Power Selection: Priority is given to a 7.5KW motor (with full rated power of the reducer). If the actual load is 70%~90% of the rated load of the reducer, a 5.5KW motor can also be selected (it needs to be calculated that the load torque ≤ the allowable value of the reducer) to avoid 'big horse-drawn carts' or insufficient power.

2. Number of poles and speed: Priority is given to a 4-pole motor (rated speed 1450r/min), which is adapted to the optimal input speed of the reducer; if the output speed needs to be adjusted, a 6-pole motor (960r/min) can be selected, but it must be confirmed that the output torque meets the working condition requirements (reducing the speed will increase the output torque year-on-year).

3. Protection level: Select according to the use environment

• Indoor cleaning scenarios (such as equipment rooms): Choose IP54 protection level to prevent dust and splashing water.

• Outdoor, dusty/humid scenes (such as mines, building materials factories): Choose IP65 protection level for more complete dustproof and waterproofing.

• 4. Installation form: Select according to the installation layout of the reducer

• Horizontal installation (most scenarios): Choose the B3 horizontal motor (the base has feet) and fix it coplanarly with the reducer base.

• Vertical installation (space limited scenario): Choose B5 vertical motor (flange installation), directly connected to the input flange of the reducer.

  5. Additional requirements: For frequent start and stop scenarios (such as intermittent operation equipment), choose a motor with soft start function, or with an independent soft starter; for explosion-proof scenarios (such as chemical workshops), choose Exd II BT4 level explosion-proof motor.