Sinewave Vs. Trapezoid Controller

[RonnieBrowen2106]

What is the advantage of a Sinewave controller over a Trapezoid Controller? I currently have had two bike kits from eBay. One was a 36v 500w motor kit and the other is a 48v 1000W motor kit. Both have had Trapezoid Controllers. I have heard smooth throttle response and increased efficiency are some of the advantages of a Sinewave controller. Are any of these true? And what are other advantages and disadvantages of both? I am building a new bike from scratch, not a kit, and I am wondering if I should get a Sinewave controller. For they are two to four times more expensive. Thank you.

 

[Triketech]

Main difference is the Sinewave drives a motor with less noise and may be less efficient; may not always is.

Not to be confused with a Field Oriented Controller (FOC). Most FOC controllers (For DC motors) produce a Sine Wave but use a complex feedback loop to calculate waveform requirements, I'm not aware of any Asian controllers that have a true FOC sinewave.

 

[PRW]

https://www.electricbike.com/sine-wave/
[youtube]y1rDws9kywA[/youtube]

 

[RonnieBrowen2106]

Main difference is the Sinewave drives a motor with less noise and may be less efficient; may not always is.

Not to be confused with a Field Oriented Controller (FOC). Most FOC controllers (For DC motors) produce a Sine Wave but use a complex feedback loop to calculate waveform requirements, I'm not aware of any Asian controllers that have a true FOC sinewave.

So what is the difference in true and not true Sinewave controllers? Also, you said sinewave controllers are less efficient? I thought that they were more efficient. I guess I heard wrong.

 

[casainho]

Main difference is the Sinewave drives a motor with less noise and may be less efficient; may not always is.

Not to be confused with a Field Oriented Controller (FOC). Most FOC controllers (For DC motors) produce a Sine Wave but use a complex feedback loop to calculate waveform requirements, I'm not aware of any Asian controllers that have a true FOC sinewave.

So what is the difference in true and not true Sinewave controllers? Also, you said sinewave controllers are less efficient? I thought that they were more efficient. I guess I heard wrong.

Should depend on hardware and firmware implementations. I think is not linear to say what is best.

Best for sure is with FOC but cheap controllers as BMSBattery S series don't have hardware that can handle FOC but at least implement sinewave.

I implemented FOC with sinewave motor control for an electric unicycle: http://forum.electricunicycle.org/topic/1109-firmware/?page=41#comment-90781

I will do an OpenSource firmware for the BMSBattery S series controllers: https://endless-sphere.com/forums/viewtopic.php?f=2&t=87870

[youtube]2nDZW4-uVys[/youtube]

 

[fechter]

The main difference will be motor noise. A sinewave will be nearly silent.
The difference in efficiency is negligible for a bike motor. Both will be very high.

 

[flat tire]

Get a sinewave controller they are really, really awesome.

 

[liveforphysics]

The big difference is trap controllers are garbage, and sinus controllers can potentially not suck if done right.

 

[ferret]

See a trapezoid controller and a sine wave controller efficiencies compared:

https://endless-sphere.com/forums/viewtopic.php?p=981766#p981766

Avner.

 

[motomech]

In real World terms, on low-powered systems, the biggest difference I have noticed is, the sine-wave system activated the PAS quicker when the pedaling was commenced and there is less run-on after stopping. Whether or not that is a function of the wave forms I have no idea.
In the area of sound, I have used square-wave controllers in the 15 to 20 Amp range that are as quiet as a sine-wave of equal rating.
I had a 25 Amp, 6-FET Lyen square-wave Mini Monster, which when used on a mini-motor, produced a "hammering" effect. Perhaps a sine-wave would be smoother in that kind of scenaro.