## Search found 43 matches

Apr 06 2021 7:45am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 115
Views: 8460

### Re: True FOC: definition and examples

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Apr 06 2021 6:52am
Forum: Motor Technology
Topic: new motor to tinker with...
Replies: 6
Views: 285

### Re: new motor to tinker with...

I happened to replace a 220V 3 ph smart motor and thought it was interesting enough to pass along. This has 3 magnets on the rotor and an 18 pole stator, a 4 inch long 1/2 inch diameter shaft with a D shape . It came off a 5 ton commercial air conditioner squirrel cage fan. These should be readily ...
Apr 06 2021 6:44am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 115
Views: 8460

### Re: True FOC: definition and examples

Yes, I guess. So is that really what the FOC is doing, just moving the hal timing a little to compensate for the current lag? Boiling it down to the simple here. Does the ultimate FOC implementation modify the shape of the sine wave being generated? The 'field weakening' still eludes me. Maybe fiel...
Apr 06 2021 5:44am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 115
Views: 8460

### Re: True FOC: definition and examples

Vesc is the best way to view its code for a beginner and from there a basic understanding of electrical principles and formula to read whats going on. Just no. If you want to understand FOC, stay away from VESC. Far far away. I've written FOC from scratch, using wikipedia as my only reference. I wa...
Apr 05 2021 3:25pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 362
Views: 99349

### Re: how to program a sevcon gen4

Hi everyone, thanks for the responses! 1. we are using a hand drill to spin the motor, so I think out rotation is good. 2. when I take the trace I have the forward switch (we are using a three position switch to switch between forward, reverse, and neither) When I take the trace I have the switch i...
Apr 05 2021 2:28pm
Forum: Motor Technology
Topic: looking for advice on how to control this 12kw etorque motor for light hybrid, suggestions and ideas.
Replies: 12
Views: 608

### Re: looking for advice on how to control this 12kw etorque motor for light hybrid, suggestions and ideas.

Hey, I just noticed what looks like a 3x Tamagawa resolver there. I'm not familiar with the Lebowski controller, maybe it can excite and demodulate that but you may need to double-check. I'm pretty sure that Sevcon Dragon 8 can operate these. Not sure about other lower end controllers like Curtis et...
Apr 05 2021 2:12pm
Forum: Motor Technology
Topic: What's the deal with ordering from QSmotor?
Replies: 30
Views: 3677

### Re: What's the deal with ordering from QSmotor?

Thanks for the feedback folks

Cheers
Apr 04 2021 3:45pm
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 115
Views: 8460

### Re: True FOC: definition and examples

is that an fzr bike? was wondering if with foc could possibly have a higher max torque output before saturating if more teeth are producing torque at once instead of 2/3rd the teeth. A CBR400RR.. similar to what I used to have. This is a huge generalization, especially since BLDC vs FOC, etc, are v...
Apr 04 2021 1:30pm
Forum: Motor Technology
Topic: What's the deal with ordering from QSmotor?
Replies: 30
Views: 3677

### Re: What's the deal with ordering from QSmotor?

Reviving this thread. Can anyone comment on their experience with QSmotor, in terms of general quality, reliability etc? Considering using them for an upcoming motorcycle project.
Apr 03 2021 3:37am
Forum: Large EV General Discussion
Topic: Need help! Electric Kart with 120100 Outrunner and Kelly Controller
Replies: 9
Views: 1030

### Re: Need help! Electric Kart with 120100 Outrunner and Kelly Controller

Does anyone have a suggestion for a controller they know would work well with this motor? Keep in mind my battery is a little over 100V at full charge, and I would like to be able to supply 300A peaks to the motor, and at least 200A continuous. Cheers, Owen They are more expensive and can be time-c...
Apr 02 2021 1:57pm
Forum: Battery Technology
Topic: Less volts means more range, amps and torque ?
Replies: 16
Views: 803

### Re: Less volts means more range, amps and torque ?

Good points, i’d like to add that i think the controller losses from switching higher voltage than needed aren’t that high. In an ideal system it saves a little bit but it’s not a deciding factor. To me some extra voltage is needed to keep some oomph in the bike at the average riding speeds. I used...
Apr 01 2021 7:10pm
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 115
Views: 8460

### Re: True FOC: definition and examples

Sensorless control methods can vary, but in general all three phases are producing some level of pulsating power, but once again it's more useful to think of the sum effect of the three phases as producing one rotating magnetic field vector that pulls the rotor magnet along.
Apr 01 2021 6:57pm
Forum: Battery Technology
Topic: Less volts means more range, amps and torque ?
Replies: 16
Views: 803

### Re: Less volts means more range, amps and torque ?

Assuming the motor is decided, the battery voltage determines maximum available speed and power, but not necessarily maximum torque, particularly at low speed. The first thing that needs to be decided is what kind of torque and speed range is needed-- i.e. power. Here the datasheet for a Yasa P400 i...
Apr 01 2021 5:34pm
Forum: Electric Aircraft
Topic: Flying taxi startup Lilium goes public via SPAC, unveils its new electric aircraft
Replies: 0
Views: 328

### Flying taxi startup Lilium goes public via SPAC, unveils its new electric aircraft

Mar 31 2021 3:53pm
Forum: Electric Aircraft
Topic: Suggested battery capacity for 30 min flight?
Replies: 32
Views: 2040

### Re: Suggested battery capacity for 30 min flight?

What is the licensing category under which you intend to test the aircraft? Probably a good idea to understand that as well, there may be restrictions on height etc..
Mar 30 2021 2:14pm
Forum: Motor Technology
Topic: Thoughts on Meiden motor?
Replies: 2
Views: 377

### Re: Thoughts on Meiden motor?

I think it depends on the required speed and torque. Motenergy may have enough power in a more compact and lighter package. It looks like this one has sin/cos encoder and if the voltage specs are compatible, you should be able to drive both motors with a Sevcon Gen4 Size6. I had no idea a supercharg...
Mar 29 2021 5:42am
Forum: Motor Technology
Topic: New ground-up ESC - MESC_FOC_ESC
Replies: 172
Views: 9841

### Re: New ground-up ESC - MESC_FOC_ESC

Hi mxlemming, awesome work and thanks for sharing. What kind of stackup did you use? copper weights and number of layers etc. I'm developing a lower power board for desktop experiments (hope to share once it has some maturity) but to keep the cost down I'm using 2-layer 3 oz.--without the extra laye...
Mar 26 2021 1:55pm
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 115
Views: 8460

### Re: True FOC: definition and examples

With FOC it's more helpful to consider that the phases are working together to create a rotating magnetic field, which pulls the rotor magnetic field along with it. A single phase will not generate continuous torque, but when combined they generate torque. You can think of the phases taking turns to...