Frequently Asked Questions About Screw Conveyor Geared Motors and Gear Reducers

1. What is a screw conveyor geared motor?

A screw conveyor geared motor is an integrated electric motor and gearbox assembly used to rotate the internal screw at the required speed and torque.

2. What is a gear reducer?

A gear reducer is a mechanical transmission unit that reduces the electric motors rotational speed and increases the available output torque.

3. What is the difference between a geared motor and a gear reducer?

A geared motor combines the electric motor and reduction gearbox into one drive assembly.

A gear reducer is only the gearbox and requires a separate electric motor or another power source.

4. Why is a gear reducer required for a screw conveyor?

An electric motor normally rotates much faster than the speed required by the conveyor screw. The gear reducer lowers this speed and increases torque so the conveyor can move the required material load.

5. How does a geared motor operate a screw conveyor?

The motor rotates the input shaft of the gearbox. The internal gears reduce the speed and transfer increased torque to the gearbox output shaft, which is connected to the conveyor drive shaft.

6. What is another name for a geared motor?

It may also be called a gearmotor, motor gearbox, reduction geared motor, geared drive, conveyor drive unit, speed reducer or screw conveyor drive.

7. What types of gear reducers are used for screw conveyors?

Common types include:

Helical gear reducer

Bevel-helical gear reducer

Parallel-shaft helical reducer

Worm gear reducer

Shaft-mounted reducer

Inline gear reducer

Right-angle gear reducer

Planetary gear reducer

The correct type depends on torque, space, mounting position and efficiency requirements.

8. What is a helical geared motor?

A helical geared motor uses angled gear teeth to provide smooth power transmission, good efficiency and relatively low operating noise.

9. What is a bevel-helical geared motor?

A bevel-helical gearbox changes the direction of power transmission, normally by approximately 90 degrees, while providing efficient speed reduction and high torque.

10. What is a parallel-shaft geared motor?

A parallel-shaft geared motor has input and output shafts positioned parallel to each other. Its compact shape can be useful where installation space is limited.

11. What is a worm geared motor?

A worm gearbox uses a worm and worm wheel to provide a high reduction ratio in a compact right-angle arrangement. Its efficiency and thermal capacity should be checked for continuous heavy-duty conveying.

12. Which geared motor is best for a cement screw conveyor?

The best option depends on the screw diameter, length, inclination, required capacity, starting load, operating hours, output speed, torque and installation space.

13. How is geared motor power selected?

Motor power is selected from the conveyor length, inclination, material bulk density, required capacity, friction, bearing resistance, screw diameter and starting condition.

14. How is gearbox output speed selected?

The output speed is selected according to the required screw revolutions per minute. It depends on conveyor diameter, screw pitch, material properties, inclination and required capacity.

15. What is a gearbox reduction ratio?

The reduction ratio is the relationship between the motor input speed and gearbox output speed.

For example, a higher ratio produces a lower output speed and generally higher output torque.

16. What is output torque?

Output torque is the rotational force available at the gearbox output shaft. It must be sufficient to start and operate the screw conveyor under the expected material load.

17. What is a gearbox service factor?

Service factor is an allowance used when selecting a gearbox for operating hours, load variation, shock loading, starts per hour and application severity.

18. Can the geared motor start a fully loaded screw conveyor?

It can only do so when the motor, gearbox, coupling and electrical starter are designed for the required starting torque. Frequent starts under full load can increase mechanical and electrical stress.

19. What is a direct-drive screw conveyor?

A direct-drive screw conveyor has the geared motor connected directly to the conveyor drive shaft through a flange, coupling or adaptor.

20. What is a chain-drive screw conveyor?

A chain-drive arrangement uses sprockets and a roller chain to transfer power from the gearbox to the conveyor shaft.

21. Which is better: direct drive or chain drive?

Direct drive is compact and reduces the number of external transmission components.

Chain drive provides greater flexibility in motor position and speed ratio but requires chain alignment, tensioning, lubrication and guarding.

22. What is a shaft-mounted gear reducer?

A shaft-mounted reducer is installed directly on the conveyor drive shaft. A torque arm prevents the gearbox housing from rotating during operation.

23. What is a torque arm?

A torque arm supports a shaft-mounted gearbox and reacts against the rotational force produced by the drive.

24. Can the geared motor be mounted at any angle?

Only when the selected gearbox is approved for the required mounting position. Mounting orientation affects lubrication level, breather position and internal oil distribution.

25. Why is mounting position important?

Incorrect mounting can prevent proper lubrication of the gears and bearings, causing overheating, leakage and premature gearbox failure.

26. What electrical supply is required?

Geared motors may be supplied for different voltages, frequencies and single-phase or three-phase electrical systems. The motor rating must match the site supply.

27. Can a variable-frequency drive be used?

Yes. A variable-frequency drive can control motor speed and allow controlled conveyor starting, provided the motor and gearbox are suitable for the operating speed range.

28. Can changing motor speed change conveyor capacity?

Yes. Changing screw speed changes the theoretical conveying rate. However, operating outside the designed speed range can cause overfeeding, wear, material fallback or motor overload.

29. What is a soft starter?

A soft starter reduces the electrical and mechanical shock during motor starting by gradually increasing the supplied voltage.

30. What motor protection is required?

Common protections include:

Short-circuit protection

Motor overload protection

Phase-failure protection

Phase-sequence protection

Under-voltage protection

Over-temperature protection

Emergency stopping

Proper earthing

31. Why is the geared motor tripping?

Possible causes include:

Screw conveyor blockage

Excessive material feeding

Incorrect overload setting

Low voltage

Phase failure

Seized bearing

Misaligned screw

Damaged gearbox

Insufficient motor power

Hardened cement inside the conveyor

32. Why is the gearbox overheating?

Possible causes include incorrect oil level, unsuitable oil, overloading, incorrect mounting position, excessive ambient temperature, blocked breather, bearing damage or continuous operation beyond the rated duty.

33. Why is oil leaking from the gearbox?

Oil leakage may result from damaged seals, excessive oil level, blocked breather, loose plugs, worn output shaft, incorrect mounting or excessive internal temperature.

34. Why is the geared motor making noise?

Noise may be caused by worn gears, damaged bearings, incorrect oil, loose mounting bolts, coupling misalignment, excessive backlash or conveyor overloading.

35. Why is the gearbox output shaft not rotating?

Possible causes include motor failure, broken coupling, damaged gear teeth, sheared key, electrical fault or complete screw conveyor blockage.

36. What type of oil is used in a gear reducer?

The correct oil type and viscosity depend on the gearbox design, mounting position, operating temperature, load and manufacturers recommendation.

37. How often should gearbox oil be changed?

Oil-change intervals depend on the gearbox model, oil type, operating temperature, operating hours and environmental conditions. The gearbox manufacturers maintenance schedule should be followed.

38. Can a geared motor be repaired?

Yes. Depending on the damage, bearings, oil seals, gears, shafts, motor windings and other components may be repaired or replaced.

39. Can a different brand of geared motor be fitted?

Yes, provided the replacement has compatible output torque, speed, service factor, mounting position, shaft dimensions, flange dimensions, electrical rating and duty classification.

40. What is the price of a screw conveyor geared motor?

The price depends on motor power, reduction ratio, output torque, gearbox type, mounting arrangement, efficiency class, brake requirement and brand.

41. Does RA Enterprises supply geared motors and gear reducers?

Yes. RA Enterprises supplies geared motors and reducers for cement screw conveyors, fly ash conveyors, feeders and other industrial material-handling systems.

42. What information is required for a quotation?

Please provide:

Screw conveyor diameter

Conveyor length

Conveyor inclination

Handled material

Required conveying capacity

Existing motor power

Motor input speed

Required gearbox output speed

Required output torque, if known

Reduction ratio

Mounting position

Solid or hollow output shaft

Shaft diameter

Flange dimensions

Electrical voltage and frequency

Duty hours per day

Existing nameplate photograph

Quantity

Delivery location

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