Wye to Delta serially connected hybrid winds.

A serially connected hybrid wye–delta BLDC machine combines the strengths of both winding configurations, offering higher torque at low speeds (from wye) and higher power/speed capability (from delta), while also improving efficiency, reducing copper losses, and enabling flexible performance tuning across operating ranges.

⚡ Advantages of Hybrid Wye–Delta BLDC Machines

1. Torque and Speed Flexibility

• Wye (Y) connection provides higher torque at lower speeds because each phase sees the full line-to-neutral voltage, resulting in stronger electromagnetic force.

• Delta (Δ) connection allows higher speed operation since each winding experiences line-to-line voltage, giving more power output at high RPM.

• A hybrid serial connection lets the motor switch or blend characteristics, optimizing performance across different operating conditions.

2. Improved Efficiency

• Wye configuration reduces copper losses at low speeds due to lower current per winding.

• Delta configuration minimizes voltage stress and improves efficiency at high speeds.

• The hybrid approach balances these effects, leading to better overall energy efficiency across the full operating range.

3. Thermal Management

• Wye winding tends to run cooler at low speeds because of reduced current.

• Delta winding spreads current differently, reducing localized heating at higher speeds.

• Hybrid connection helps distribute thermal load more evenly, improving reliability and lifespan.

4. Power Density and Performance

• Delta connection supports higher power density and faster response.

• Wye connection supports stable torque output and smoother operation.

• Together, the hybrid design achieves both high torque and high speed capability, which is difficult with a single configuration.

5. Application Versatility

• Hybrid BLDC machines are well-suited for applications requiring wide speed ranges and variable load conditions, such as:

  • Electric vehicles (EVs)

  • Robotics

  • Industrial automation

  • Drones and RC systems

This is a parallel wye-to-delta serially connected hybrid I wound for running verification. I’m pretty sure it’s the only parallel version of a serially connected hybrid external rotor BLDC in the world. It’s definitely the only hybrid-wound hobby machine you’ll see that actually runs. Plenty of wild and baseless claims have been made on various hobby forums, but none of them include recorded motor constants, proper execution and winding termination, and a video of it in action.

Here it is actually running. It is a super quiet machine. A hybrid configuration is a version of dual 3 phase which has a higher winding factor than a conventional delta or wye 12 slot 10 pole machine with a very low idle current for a 650 class motor over 1000Kv confirming lower ac losses.

https://www.youtube.com/watch?v=aiwDzjbiOK4