Compensation springs are used to reduce the noise and vibration levels of electric motors, increasing strength, duration, and overall performance.

Their function is to compensate for axial tolerances of the bearing, avoiding the slackening of the balls in the races as though they were shock absorbers.


AFA manufactures standard and, on request, custom compensation springs.

Each shipment includes the compression test results conducted on each production batch and the spring load chart.

Standard models manufactured with C67 and hardness 45 – 50 HRC, obtained through austempering treatment with salt quenching. A procedure that provides the part with maximum elasticity, maximum fatigue strength, and uniform thrust on all of the contact points.

Fields of use

Load compensation springs are used in the electric motors of

washing machines



When we talk about compensation springs, we are referring to special supports that are used to reduce vibrations and noise in electric motors. Plus, they make it possible to extend the operational duration of the motor, as well as the service life of the ball bearings. This happens because, through compression, the bearing’s axial tolerances are compensated (like a shock absorber).

Most products that are now part of common use include load compensation springs. They are especially used in the drains and motors of washing machines and dishwashers, but also in dryers. It is important to highlight how essential this tiny component is for the correct operation of these tools: this makes it possible to assess each purchase correctly, achieving the maximum results.

Important parameters: flexibility and rigidity

Compensation springs work by applying a force that is proportional to the compression that they are subject to. Each part, through an ad-hoc customisation process, can have different characteristics. To correctly assess the compensation springs, it is necessary to keep certain essential parameters in mind: rigidity and flexibility.

The reference is specifically to the speed that the spring expresses increases, while the spring itself is subject to compression. Each customer can have different needs, and it is possible to intervene on this parameter. For example, if it is necessary to use a more rigid spring, it will be necessary to increase the wire gauge (reducing the spring diameter); on the other hand, if a more flexible spring is necessary, it will be necessary to do the opposite.

What sectors use compensation springs

Load compensation springs are used in sectors such as automotive, the oil and steel industries, and more. It is possible to design compensation springs by referring to a set of base materials in combination with optional treatments: naturally, all of this is in view of customisation and based on the specific use and destination of the accessory. It will first be necessary to identify the type of fatigue the spring will be subject to. Let’s see what characteristics make it possible to assess the quality and operational capacities.

Characteristics that determine spring function

We have already mentioned the importance of aspects such as rigidity and flexibility, combined with the number of waves, characteristics of forces that the spring can apply and counter. The springs that we use often require prior setting, so as to compensate for lengthwise sag – completely functional – that occurs during the work phase (the spring is compressed to the work length, so as to assess the relative sag).

Another crucial factor is the frequency of use: some supports work statically, and others are dynamic (for example, a slow combustion motor). The aspect relative to the frequency of use affects the choice of material used to manufacture it.