Electric screwdrivers

In electric screwdrivers, motor control plays a crucial role, which directly affects the tool's performance, efficiency and user experience.

At the same time, the use of high-efficiency motor drive chips and power management systems improves the energy efficiency ratio of the entire tool, in line with the requirements of environmental protection and sustainable development.

 In conclusion, the application of motor control in electric screwdrivers is multifaceted, which not only improves the performance and efficiency of the tool, but also lays the foundation for the future development of intelligent, high-precision and energy-saving environmental protection. I. Main functions of motor control Speed control Principle: The speed of the motor is regulated by changing the input voltage or current of the motor. For example, using Pulse Width Modulation (PWM) technology, the average voltage of the motor is adjusted by changing the duty cycle (i.e., the ratio of the time of the high level to the period), so as to realise precise control of the speed. When the duty cycle increases, the average voltage obtained by the motor increases and the speed is accelerated; on the contrary, it is slowed down. Application Scenario: When tightening screws of different materials or specifications, different speeds are required. For softer materials (e.g. plastic screws), low-speed tightening can prevent screws from being damaged; while for larger metal screws, high-speed tightening can improve work efficiency. Torque Control Principle: Torque is directly proportional to the current of the motor. By detecting the current of the motor, when the current reaches a set threshold, the control circuit will automatically adjust the power output of the motor to limit the torque. For example, when tightening a screw, if the screw encounters greater resistance, the motor current will increase, and when the current reaches the current value corresponding to the set torque limit, the motor will stop rotating or reduce the power to prevent the screw from being over-torqued or damaged. Application Scenario: In the assembly of some electronic devices, the tightening torque of screws has strict requirements. For example, when assembling mobile phones, the tightening torque of the screws needs to be precisely controlled to avoid damage to the precision components inside the mobile phone. Forward and Reverse Control Principle: The forward and reverse rotation of a motor is achieved by changing the phase sequence of the motor's power supply. In the circuit of an electric screwdriver, there is usually a reversing switch. When the forward button is pressed, the circuit is connected so that the motor turns forward; when the reverse button is pressed, the circuit changes the phase sequence and the motor reverses. Application Scenario: The forward and reverse function is essential when removing and installing screws. Users can quickly switch as needed to improve work efficiency.

Second, the impact of motor control technology on the performance of electric screwdrivers Improve precision Precise speed and torque control can make electric screwdrivers more accurate when tightening screws. For example, in some high-precision mechanical assembly, such as the assembly of aerospace components, the tightening torque of the screws needs to strictly meet the design requirements. Through advanced motor control technology, electric screwdrivers can achieve torque output with very small error, ensuring assembly quality. Enhance efficiency Reasonable speed control can automatically adjust the motor speed according to different work scenarios. For example, when tightening multiple screws of the same specification, the electric screwdriver can quickly complete the tightening of each screw through the quick start and stop function, which greatly improves work efficiency. Extend service life Good motor control can avoid motor overload operation. When the motor current exceeds the rated value, the control circuit can cut off the power or reduce the power in time to protect the motor from damage. At the same time, accurate torque control can also reduce the impact of the screwdriver on the screws and the tool itself during the tightening process, thereby extending the service life of the tool.

Third, the future development trend Intelligent control With the development of the Internet of Things and artificial intelligence technology, the motor control of electric screwdrivers will be more intelligent. For example, through built-in sensors and wireless communication modules, electric screwdrivers can upload the working status (such as speed, torque, working time, etc.) to the cloud in real time. Users can remotely monitor and adjust the screwdriver's working parameters through mobile phone applications, and even automatically select the best control mode according to different working scenarios. High-precision control In order to meet the demand for higher-precision assembly, the motor control precision of electric screwdrivers will continue to improve. For example, more advanced sensor technology is used to accurately detect the current and speed of the motor, combined with more complex control algorithms (such as fuzzy control, adaptive control, etc.) to achieve fine-tuning control of the motor, so that the electric screwdriver can meet the extremely high requirements of microelectronics, precision machinery and other areas of the screw tightening accuracy. Energy saving and environmental protection The future motor control of electric screwdrivers will pay more attention to energy saving. Through the optimisation of the control algorithm, the motor is always kept in the best energy consumption state during the working process. For example, the power output of the motor is automatically reduced at low loads to reduce energy waste.