Using Multiple Motors To Improve Vibration Strength
Posted in 2018-05-02 13:41:07 in Tech Blog, 2 Comments

There are a variety of methods to increase a motor’s vibration strength, such as for example increasing the motor speed, the eccentric mass, or the mass’ distance from the motor shaft. Regrettably many of these are unavailable to your customers because they are factory defined.

However it can be done to use multiple motors to improve the entire vibration strength.

When two motors of the same velocity are aligned therefore their shafts are in the same direction, the rotation of the masses will ultimately synchronise. It has the same impact as merging the masses into one motor, and the result may be the sum of both motor’s vibration amplitudes.

This is possible as the two motors, even if they’re the same type and batch number, could have slightly different speeds. Ultimately the faster engine will meet up with the slower one. Once their masses synchronise it needs an extra little bit of energy for the quicker motor to ‘leap’ out of sync. This energy is usually unavailable as the motors are powered at the same (tough) speed, and continue steadily to turn together.

If two motors of the same model are used, it really is equal to doubling the mass. The method for vibration strength is given as:

F0=mrω²

We can observe that doubling the mass doubles the pressure produced F0.

This behaviour works from cylindrical ERMs, coin vibration motors, and linear resonant actuators (although predicated on the same principle, the formula differs). Keep in mind for coin motors the electric motor shaft is vertical!