Comparison of Brushless Drill Drive Solutions

Common indicators of brushless drill drive solutions on the market

 

Control accuracy:

Most brushless drills use a six step commutation method, which uses Hall sensors to detect the position of the motor rotor and control the motor operation. However, at low speeds, the speed fluctuates greatly, and commutation can easily generate torque fluctuations, resulting in unstable motor operation and high noise.

After testing, it was found that the electric drill of a certain brand using this scheme had a speed fluctuation of ± 50rpm at 1000rpm.

Efficiency:

The efficiency of the six step commutation method drive is still acceptable at low speeds and light loads, but it significantly decreases at medium to high speeds or heavy loads. The torque fluctuation during the commutation process causes a large amount of energy to dissipate in the form of heat and noise, while the power factor decreases, and the motor cannot fully utilize the output power of the battery.

Experimental data shows that a certain electric drill has a driving efficiency of only 70% at 2000rpm and rated load.

Torque performance:

The electric drill driven by the six step commutation method will experience a sharp increase in motor current during high torque output, which can easily lead to motor overheating and rapid battery depletion.

According to tests, when the output torque of a certain brand of electric drill reaches 20nm, the motor current surges to 15A, which not only affects work efficiency but may also cause damage to the motor.

Noise control:

Due to issues such as control accuracy and torque fluctuations, the brushless drill driven by the six step commutation method produces significant noise during operation, especially at high speeds and loads.

At 3000rpm and rated load, a certain electric drill produces a noise level of up to 90 decibels, which may cause serious hearing damage to the operator if used for a long time.

Protection function:

Some brushless drill solutions have basic overcurrent, overvoltage, and undervoltage protection functions, but their protection mechanisms are often not perfect when facing complex working conditions.

For example, when a certain brand of electric drill experiences motor stalling, the overcurrent protection is delayed by 2 seconds before triggering. At this time, the motor has already experienced significant winding heating due to long-term overload, causing irreversible damage to the motor.
Analysis of key technological elements that benefit the world

 

Control accuracy:

The driving scheme of the Li Tian Xia brushless electric drill adopts vector control technology combined with high-resolution encoder, which accurately decomposes the stator current of the motor into excitation current and torque current, and independently controls them to achieve precise adjustment of the motor torque.

For example, at a speed of 1000rpm, the speed fluctuation is only ± 5rpm, and the fluctuation is reduced by about 90%. The smoothness and noise control of the motor operation have reached an excellent level.

Efficiency: Our company adopts innovative control algorithms and optimized circuit design. Within the commonly used speed range of 1000rpm to 3000rpm, the driving efficiency remains at a high level of 88% -92%, which is an average improvement of 20% compared to the traditional six step commutation method.

Torque performance: Under the conditions of 12V voltage and 5A current, the output torque of this scheme can reach 30nm, which is 50% higher than the torque output of traditional schemes under the same conditions.

Noise control: Under the same working conditions, the noise level of this drill solution is only 75db, a reduction of 16.6%, providing a quieter and more comfortable working environment for operators.

Protection function: covering multiple protection functions such as overcurrent, overvoltage, undervoltage, locked rotor, overheating, short circuit, etc. When the motor experiences stalling, the system can quickly cut off the motor power supply within 0.1 seconds, effectively preventing the motor from burning out due to overload and improving the safety and reliability of the drill in all aspects.
summarize

 

The brushless drill drive scheme that benefits the world has demonstrated significant advantages in key indicators such as control accuracy, efficiency, torque performance, noise control, and protection functions. Choosing our brushless drill drive solution not only enhances the market competitiveness of our products, but also helps the engineering field move towards a higher level.