Endless Sphere

I've been measuring all over the PCB (not every single point, but at least a hundred so far, most of them unlikely but ran out of likely ones), and still have not found a place I can connect to for battery voltage so the brain board can measure the battery voltage. Either I've just missed it, or I'...

Later EVT's were fitted with a brushless motor. As you probably know the EVT's are Taiwanese and the later brushless motor is extremely well made. It is a 6 pole pair motor and the stator is stuffed with copper. Performance capability considerably greater than its 1500 watt rating. If you can find o...

The overall diameter of the motor is missing, but from the r1 and r0 values i figure it to be 4".. or 5' overall. 9S/6P and at 60v she spins 1k - 1.2k rpm to get 750w of output. The biggest problem of using this design for a bike is probably the motors thickness,.. but, just thinking out loud. The ...

I finished machining the spacers for the 20T coils, wound up the cores with 20 turns, and gave it the spin test again. Surprisingly unsurprising,.. it came out to exactly 2v at 550 rpm. Your Kv has gone from 53 rpm/V with 10 turns per tooth to 26.5 rpm/V with 20 turns per tooth. Formula #13: turns ...

Guess I'll just try it and then see if the motor spins or if the magic smoke comes out. Eric What is "it" ? Point 1) what you propose will not work, 100% guarantee and connecting 5V directly to the 16 ohm drive coil could possibly damage your contoller. Point 2) *IF* pin 16 on the controller happen...

That will not work. The resolver in that motor requires a sinusoidal drive signal in order to output a sin and cos signal. Your controller is designed for an RMB29AC that does not require a drive signal. It is not clear from the manual if pin 16 on the controller outputs a sinusoidal drive signal, i...

Thanks guys, that changes things a bit. Kiwifiat, I'm not sure what '6 x SQR(3)' means. But 10.4 Kv comes out to 416 rpm at 40v, and 540 rpm at 52v. (Using a Kv/rpm/volt calculator; http://www.rcdronegood.com/brushless-motor-kv-to-rpm/) I found this handy dandy calculator, found here on Spinningmag...

It is a 3 phase motor and assuming it produces a sinusoidal back emf an alternative approach to calculating Kv would be to look at the DC voltage required to produce 3 120 degree separated sinusoidal voltages with a magnitude of 6V as generated by the motor at 550rpm. The answer is 6 x SQR(3) = ~10....

Part of this is experimentation and that includes running higher current on the current sensors by shunting them as I have not done that with these sensors. In the past I've used HASS sensor for higher current stuff, but they get more costly. I haven't worked with the Melexis style sensors yet, but...

Nice job , I love your LED stargate. I could be interested in the gate driver boards for a 24 fet TO-247 setup. I think for a 24 fet setup 400 amp current sensors would be insufficient. I am going to give the Melexis MLX91205 sensors a try since they are not badly priced and good for up to 800 amps ...

If you mean this one, then I see six magnets in a circle. If they are each magnetized as pole pairs then I guess it would be six. If they're only one pole each, then it's 3 pole pairs. Qwerkus said "6 poles", so he means it's 3 pole pairs. https://endless-sphere.com/forums/download/file.php?id=2527...

Oh you mean something that would resize images as they're being uploaded to make uploads easier. Yeah that's a huge code change and future maintenance nightmare that i'm not willing to take on. It's a key reason we want to get away from phpbb. it's shocking that phpbb hasn't added some basic code t...

Tom de Bree published an investigation of the Honda IMA inverter over on DIYElectriccar.com back in 2015. Tom advises that the current sensors are 5.8mV/amp. Anybody wanting to set up a Lebowski controller from scratch should read the manual published by Lebowski for the firmware version loaded on t...

The motor is an IPM and therefor generates reluctance torque as well as PM torque and to get the best out of it you need a controller that can handle FOC. The lebowski controller works well with IPM motors. Also the HSG has a resolver not HALL sensors so you need a resolver to HALL converter or fit...

The same is true of the BobC buildup-and-test document; there's a number of things I think he simply didn't get to write before he died. This is another document I hope to perfect for others to use, but will probably need feedback on it as I go. No doubt Bob would have sorted everything out had he ...

Is there a particular reason the throttle *must* be powered by the brain board itself, and not an external 5v? That was not the point of the post. The throttle *must* be powered in order for the controller to function and none was shown. Now that you have updated your schematic there should be no r...

Your wiring diagram does not show any connection to 5v for the throttle. The controller will not run without the 5v going to the throttle.

Also 2us for automotive power section seems small. I use 3.1us with Volt inverter. I broke two Volt inverters using 1.8uS because i mistakenly calculated my deadtime. Better have some holes in PWM signal than in IGBTs i say. If you're referring to Kiwifiat's post up above: Because IGBT's are slow i...

Yes please let me know how it goes. I have great experience with simple Johannes resolver interface. EDIT: I may put a dual Lebowski board in production. This one i intend to make with Prius resolver chip. @Kiwifiat, how did you find that chip operating in resolver 2 communtation mode on its own? I...

Because IGBT's are slow in comparison to mosfets we need to set deadtime to 2000ns and pwm frequency to 6kHz.
The following image shows how to wire a BobC brain board into an IMA inverter:

Sure you can run it on any voltage that suits your application. I was testing an IMA inverter/Sonata HSG today on 6S lipo. Bear in mind that power = angular velocity x torque so at a lower voltage you will get less power. At 80V the motor will turn at ~2500rpm. As far as how it would run on a standa...

After lunch I'll be making up the external-connection parts of the wiring that goes from outside to inside the HILs: --2-wire 12v --3-wire serial (db-9) --5-wire halls --3-wire throttle --3-wire ebrake Skip the "2-wire 12V " there are pins on the grey male socket for 12V supply that feed the isolat...

Well i tested what you said and i used those values on my Prius compressor f) wiggle range: 74 deg g) wiggle rate: 119 Hz I now get reliable start everytime with some ratcheting of course. But important is that motor wont just conk out if i apply too much throttle. Eventually it will start accelera...

Below the relevant section for the Sonata HSG running on 48S ~ 200V on a Honda IMA inverter. The motor starts perfectly in sensorless.
With both the HSG and Leaf motor higher wiggle rate seemed to my real time statistics to work better.

I'd try angle of 10, 20, 30 and 40 degrees, and 5, 10, 15 and 20 Hz for frequency. This makes 16 combinations to try... That is precisely what I did except I went way higher on frequency. When I get back to my workshop later today I'll post my settings. With ebike hub motors the default settings wo...