How to reduce Noise in a DC/BLDC Motor System

Why is noise control important in DC MOTOR/BLDC Motor?

DC/BLDC motors are widely used in various fields such as industrial automation, robotics, and household appliances. There are some specific application areas that need to consider the working environment and human-computer interaction issues, so controlling noise is very important in the design of DC motors.

This article will explore the main sources of noise in DC and BLDC motor systems and share effective methods for reducing noise in DC MOTOR/BLDC MOTOR design.

Main sources of Noise in DC/BLDC Motors

1.Vibrations

Mechanical clearance inside the motor, including clearance between bearings and shafts, is a common source of noise. These clearances cause vibrations when the motor rotates, which in turn creates noise.

2.Load Imbalance

When a motor is overloaded, it causes excessive pressure and friction on the mechanical parts inside the motor, such as the bearings and rotor. This excessive friction causes vibration, which in turn produces noise.

3.Electromagnetic interference

Electromagnetic interference (EMI) noise mainly comes from current pulsation, magnetic field changes and electrical harmonics inside the motor.

4.Motor Speed

The noise of the motor at high speed is significantly greater than that at low speed.

Top 5 strategies for reducing DC/BLDC Motor noise

A.Choose right Motor

A suitable motor can effectively reduce noise during operation. SGMADA recommends that customers choose motors with low speed and close rated operating point when selecting.

B.Reduce Mechanical Play

SGMADA reduces noise by using high-precision bearings and accessories to ensure tight fit between components.

C.Optimizing Control System

Correctly tuning the drive electronics ensures that the motor operates at its optimum level and avoids unnecessary current fluctuations.

D.Vibration Damping Materials

SGMADA recommends using rubber or elastomeric materials between the motor and the mounting surface to absorb vibration energy in some motor designs with low noise requirements.

E.Shielded Cables

Using shielded cables to connect motor phases and sensors helps improve electromagnetic immunity, resulting in smoother motor operation and less noise.

Conclusion

To reduce noise in a DC/BLDC Motor system, it’s important to consider the entire application include:

• Minimize moving parts.
• Reduce system operating speed.
• Avoid resonance frequencies to prevent amplified vibrations.
• Choose appropriate components and ensure proper motor control.

By following these practices, engineers can effectively reduce noise and vibration, enhancing system efficiency and user satisfaction.