E-Bike Conversion Kit Powered by Makita 18V Battery

Over the past six years, my journey developing an all-in-one intelligent electric-assist wheel (e-rim.com) has focused on crafting and refining three core components essential to electric-assist bicycles: the motor, controller, and battery. My work in these areas has not only resulted in several invention, utility model, and design patents but has also driven me to consistently push the envelope on new technologies and application methods. This continuous pursuit has been both challenging and rewarding, and I am pleased with the progress we have made. However, the journey hasn’t simply been about endless innovation; it's about creating practical solutions that make sense for real-world applications.

While technological innovation is a driving force within the IT industry, I recognize that the needs of the traditional bicycle industry are somewhat different. Durability, simplicity, and affordability are paramount when designing products intended for everyday use. Cyclists want reliability without being bogged down by unnecessary features or a steep learning curve. Additionally, ensuring that products are reasonably priced is crucial in an industry where cost remains a key factor in consumer decision-making. My approach has, therefore, always been to balance cutting-edge technology with practicality, delivering a solution that meets the real-world demands of cyclists.

After several iterations and extensive testing, we are proud to present the eKits electric-assist kit (e-rim.com/ekitsen). This kit is the culmination of years of research and development, and each component has been carefully selected to ensure a seamless, efficient, and enjoyable riding experience. Here’s an overview of the eKits components and what makes each one unique:

1. **BLDC Motor**: Our motor is a Brushless Direct Current (BLDC) model, designed and manufactured by a Taiwanese factory with over 40 years of experience. This choice was intentional, as durability and reliability were non-negotiable requirements for us. In my experience, motors manufactured in Taiwan have proven to exceed the reliability and lifespan of those produced in mainland China. Our front-wheel motor design works in tandem with the rear-wheel pedaling mechanism, which allows for an even distribution of effort and aligns with the Dual Drive concept popularized by Bridgestone electric-assist bicycles. This means that the motor doesn’t just work independently but complements human effort, resulting in a more natural and energy-efficient ride.

2. **Controller**: At the heart of our electric-assist system is an innovative controller, a small but powerful component that sets the eKits apart. Our custom algorithm has been fine-tuned to support both 18V and 40V battery options, and it intelligently combines the motor Hall signals with data from an external pedal sensor. This arrangement enables a "pedelec" (pedal electric cycle) experience, similar to Yamaha’s highly regarded Pedal Assist System (PAS). By allowing the motor assistance to kick in naturally as the rider pedals, the eKits controller delivers a smooth and intuitive electric-assist experience. Our objective was to create a system that feels less like a motor suddenly taking over and more like a natural extension of the rider's own power.

3. **Battery**: Among the challenges we faced during development, refining the battery system was perhaps the most persistent. Finding a battery that meets requirements for weight, size, durability, and cost while also navigating the complex regulatory environment around battery transportation proved to be no easy feat. However, after much consideration and testing, we identified Makita rechargeable lithium batteries, which are widely available and commonly used in power tools across more than 40 countries. With Makita batteries, our eKits are not only more accessible but also provide a reliable power source that is easy to find, replace, and use. With the right tweaks to the motor and controller, we have optimized our system to run smoothly on these 18V Makita batteries, maintaining efficient performance while offering a flexible and practical battery solution.

While it's true that lowering the battery voltage results in reduced torque from the motor, this performance is still more than adequate to meet the demands of typical urban commutes, school trips, and other everyday transportation needs. For most users, the system’s power levels are sufficient to navigate daily routes with ease. Additionally, by selecting an 18V battery, we have been able to offer an affordable and accessible option for consumers who might be put off by the cost of higher-voltage alternatives. For those seeking a reliable electric-assist solution that doesn’t compromise on quality, the eKits is a versatile option that can be easily adopted and maintained.

With its reasonable price point, the eKits system, powered by a standard Makita 18V battery, represents a significant shift in electric-assist technology. I am confident that users will appreciate the option to use a commonly available, high-quality power source like the Makita battery. This solution not only aligns with our commitment to practical and durable design but also offers an affordable entry point into the world of electric-assist bicycles. Whether you're a daily commuter, a student, or someone who simply enjoys cycling, the eKits provides a smart and accessible way to enhance your riding experience. Our mission has been to create an electric-assist kit that fits seamlessly into your life, helping you travel further, faster, and with greater ease.

The journey of developing the eKits has been a blend of innovation and pragmatism. We have prioritized the needs of our users, focusing on durability, simplicity, and cost-effectiveness without sacrificing the quality or integrity of the product. I am proud of what we have achieved with eKits, and I look forward to seeing how it helps more riders discover the joys of electric-assist cycling.