Is DC motor braking the cause of motor jitter?

DC motor braking is one possible cause of motor jitter, but it is not the only one.

1. Introduction

DC motors are widely used in many applications, such as industrial production lines, transportation vehicles, etc. However, during the motor braking process, jitter problems will occur, which affects the operation effect and service life of the motor. This article will explore the causes of DC motor braking jitter in detail and put forward some suggestions to alleviate the jitter problem.

2. DC motor braking process

The braking of a DC motor is generally achieved by changing the input voltage or current of the motor. At the beginning of braking, the input voltage or current of the motor suddenly decreases, causing the motor stall torque to drop sharply. At this time, the rotational inertia of the motor will cause it to continue to rotate until it stops. However, due to the sudden decrease in braking torque, the motor will generate a reverse rotational torque, that is, an imbalance between the braking torque and the rotational inertia of the motor.

3. Causes of DC motor braking jitter

3.1 Imbalance between braking torque and motor inertia

Due to the sudden decrease in braking torque, the rotational inertia of the motor will continue to drive it to rotate, but the braking torque is not strong enough to stop the motor from rotating. This imbalance can cause the motor to jitter before it stops. When the motor stops rotating, the braking torque suddenly increases, and the impact torque generated can also cause the motor to jitter.

3.2 Design and installation problems of the brake

Design and installation problems of the brake can also cause DC motor jitter. For example, the braking torque of the brake may be unevenly distributed, resulting in uneven torque action on the motor during braking, which in turn causes jitter. In addition, the installation position of the brake will also affect the braking effect of the motor. If the brake is installed unstably or unevenly, it will also cause motor jitter.

3.3 Current changes during braking

During the braking process of the DC motor, the current changes. When the current suddenly decreases, the magnetic field inside the DC motor will also change, which may cause an imbalance in the instantaneous motor torque, which in turn causes jitter. In addition, due to the change in current, the magnetic field caused by the current in the motor winding will also change, causing vibration of the motor.

4. Methods to reduce the braking jitter of the DC motor

4.1 Optimization design of the motor system

In order to reduce the braking jitter of the DC motor, it can be achieved by optimizing the design of the motor system. For example, a precise brake design can be used to ensure that the braking torque is evenly distributed. In addition, the rotational inertia of the motor can be optimized to better adapt to the braking process.

4.2 Control of braking torque

During braking, the jitter problem can be alleviated by controlling the rate of change of the braking torque. Gradually reducing the rate of change of the braking torque can gradually slow down the motor rotation, thereby reducing jitter. In addition, an electronic brake can be used to control the change of current, thereby reducing the change of the magnetic field inside the motor and reducing jitter.

4.3 Controlling the change of motor current

During the braking process, controlling the change of motor current is also a key factor in reducing jitter. By adopting advanced current control technology, more precise braking can be achieved and jitter caused by current changes can be reduced. For example, a PID control algorithm can be used to control the change of motor current.

5. Conclusion

DC motor braking jitter problem is a common challenge in DC motor operation. However, this problem can be alleviated by optimizing the design of the motor system, controlling the change of braking torque and current, etc. For specific application scenarios, special design and optimization control may be required according to actual conditions. In summary, when designing and applying DC motor braking systems, various factors need to be considered comprehensively to reduce the occurrence of jitter problems and improve the performance and service life of the motor.