What is USM

ByScarface Hernandez gravelle 2020-01-07 750

USM (Ultrasonic Motor) refers to the ultrasonic motor, which is used in Canon camera lenses to drive. Traditional motors work based on electromagnetic principle, which converts electromagnetic energy into rotational energy. USM is based on the new principle of transforming ultrasonic vibration energy into rotational energy.

USM ultrasonic motor classification

According to the method of transforming ultrasonic vibration energy, there are three types of USM:

1, standing wave type (Standing Wave Type);

2, traveling wave type (Traveling Wave Type);

3, and USM, used in vibrating Reed (Vibrating Reed Type).

Canon EF lens all belong to traveling wave type.


The structure of the annular USM is simple: it consists of an elastic stator and a rotor. The stator is a metal ring with piezoelectric ceramic elements at the bottom and trapezoidal protrusions uniformly arranged at the top. It is made of special materials, and its coefficient of thermal expansion is the same as that of piezoelectric ceramic elements, so that the effect of temperature change can be avoided. The rotor is an aluminum ring that is combined with the stator through a flange spring. As the aluminum material is relatively soft, the bonding part is specially treated to increase its wear resistance.

Basic characteristics of USM  

1, It has the output characteristic of low speed and high torque.

2, large braking torque;

3, simple structure;

4, motor start and brake are very controllable;

5, rotation sound is very small, almost silent;

Canon ring USM not only has the above basic characteristics, but also has its own characteristics:  

6, high efficiency, low power consumption;

7, ring motor can be perfectly combined with the mirror body;

8, low speed, especially suitable for lens AF drive;

9, rotation speed can be arbitrarily controlled in the range of 0.2rpm~80rpm;

10, sensitivity adjustable electronic MF;

11, working environment temperature is : -30 ℃ ~ + 60 ℃. 


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