seandepagnier
1 µW
- Joined
- Oct 18, 2021
- Messages
- 1
I am searching for information on this, and what I find indicates that 5 phases would give higher efficiency than 3 for various reasons.
I realize it is slightly more complex and the motor controller would cost more, but really I don't think the cost difference justifies it. For power generation such as wind turbines, the cogging would be much lower too.
So, why not 5 phase (and higher) motors? For sensorless, 4 of the 5 are powered which gives obvious higher efficiency. There are less eddy losses, more usable torque, and even more precision for servo applications. The efficiency gain of (possibly 2-3%) is pretty significant when these motors are already fairly efficient. What is holding us back?
What would be the ideal stator/pole count? 15s20p?
There are also (dual 3 phase or 6 phase) with reportedly higher efficiency. Can someone explain why the 2 sets of 3 phase windings are 30 degrees out of phase?
I realize it is slightly more complex and the motor controller would cost more, but really I don't think the cost difference justifies it. For power generation such as wind turbines, the cogging would be much lower too.
So, why not 5 phase (and higher) motors? For sensorless, 4 of the 5 are powered which gives obvious higher efficiency. There are less eddy losses, more usable torque, and even more precision for servo applications. The efficiency gain of (possibly 2-3%) is pretty significant when these motors are already fairly efficient. What is holding us back?
What would be the ideal stator/pole count? 15s20p?
There are also (dual 3 phase or 6 phase) with reportedly higher efficiency. Can someone explain why the 2 sets of 3 phase windings are 30 degrees out of phase?