Due to the complexity of the mechanisms and the multitude of options, choosing a geared motor is by no means a simple task. Your goal is probably to order the right drive for your application. In this category you will find quick tips on how and where to order a geared motor, and what to prepare so that the purchase is right first time.
How do I order a geared motor?
You can order a geared motor directly from the manufacturer – for example via the NORD website – or through sales and technical support that will help you select the appropriate configuration for your machine and operating conditions.
To make the order go smoothly, prepare the basic data:
- the application type (e.g. conveyor, agitator), the required torque and speed, and the motor power supply,
- the installation position / mounting arrangement (from the name plate) and the ambient conditions (e.g. moisture, wash-down).
In practice, it is best to use a professional who can support you in the selection and in contact with NORD (on a consultancy basis, as sales support), so that the geared motor ordered matches your installation in terms of parameters and mounting. SPEC SERWIS regularly carries out this type of order and has already helped many, many customers select the right drive.
What are the common problems with geared motor selection?
The most common problems with geared motor selection result from the fact that it is selected "by power" or "by gear ratio", while the real loads and operating conditions are overlooked. Typical mistakes:
- Underestimating the output torque: friction, motion resistance, inclines and load changes not taken into account.
- No analysis of starting and dynamics: too little starting torque, problems accelerating the inertia (J), excessive overloads during start/stop.
- Incorrect speed / gear ratio selection: operation outside the optimal range (too slow/too fast), no adjustment capability, wrong selection for use with a frequency inverter.
- Duty cycle overlooked: S1/S3, frequent starts, intermittent operation, peak operation – resulting in overheating.
- Incorrect service factor: no margin for shocks, overloads and process variability.
- Mounting and lubrication errors: an unsuitable installation position (orientation) affects lubrication/oil and service life.
- Radial and axial loads on the shaft not taken into account: wrong selection of the bearings/output for a pulley, pinion or coupling.
- Wrong environmental parameters: IP protection rating, dust, wash-down, chemicals, temperature, corrosion, outdoor operation – selection of seals and coatings.
- No requirements regarding accuracy and backlash: backlash, rigidity, repeatability (important in positioning).
- Electrical mismatch: voltage, frequency, control method, brake, encoder, efficiency class, compatibility with the frequency inverter.
- Dimensional and service constraints: no space for mounting, no access to the breather/plug, difficult servicing.
- Safety requirements and standards overlooked: e.g. ATEX, lifting applications, brake redundancy.
In order to reduce the risk of the problems listed above, do not hesitate to use the help of professionals. There is a good chance that you will be ordering a drive made to order specifically for your needs, so in the event of a mistake, returning the product may be a problem.