Some BLDC drives do not use a sensor:
http://www.st.com/resource/en/application_note/cd00020086.pdf
https://www.infineon.com/dgdl/an-1187.pdf?fileId=5546d462533600a40153559af4db1155
https://www.allegromicro.com/en/Products/Motor-Driver-And-Interface-ICs/BLDC-Drivers/A4960.aspx
https://www.google.com/patents/US8558495
http://ww1.microchip.com/downloads/en/AppNotes/doc8192.pdf
On 3/23/2018 8:52 PM, Chris Albertson albertson.chris@gmail.com
[7x12minilathe] wrote:
> All steppers, two phase and three phase are in fact a type of BLDC motor.
> The term "BLDC" simply means "brushless" or that the commutation is done by
> something external to the motor.
>
> I THINK(?) one big difference between a BLDC that is intended for
> continuous motion and one that is intended to be stepped is the slight
> misalignment the stepper has between the phases. This is a physical thing
> about the shape of the metal parts inside. To make a motor step when one
> coil turns off and another turns on the coils must be a step size out of
> phase with each other. I think a 3-phase stepper has three coils each
> one 1.2 degrees ahead of the last one.
>
> The second big difference between a BLDC for contoinous motion and for
> stepping is the position sensor. There is no sensor on a stepper the ESC
> needs sensor input. So no, you could not use a conventional ESC with a
> three phase stepper.
>
>
> I think in general three phase motors might outperform two phase motors and
> if you buy a 3-phas stepper together with a matching controller both made
> by the same factory as a set then it should work fine for you. But notice
> for the same torque and speed the 3-phase solution costs way more then
> double. Stepperonline has a 400 in qz motor/drive combo for $50 but the
> price of a 225 in oz combo 3-phase is about $100. Double the price for
> less power. Yes that is unfair the three phase unit should run smoother
> but on the other hand the new 2-phas digital drivers are very good and run
> the motors silently. Now that these drivers are available I wonder if
> there is a market for three phase steppers?
>
>
>
> On Fri, Mar 23, 2018 at 4:49 PM, Ralph Hulslander rhulslander@gmail.com
> [7x12minilathe] <7x12minilathe@yahoogroups.com> wrote:
>
>>
>> Would a ESC work, are they a BLDC (Brushless DC motor).
>>
>> A BLDC is essentially a 3 phase AC motor.
>>
>> Ralph
>>
>> On Fri, Mar 23, 2018 at 6:15 PM, Chris Albertson albertson.chris@gmail.com
>> [7x12minilathe] <7x12minilathe@yahoogroups.com> wrote:
>>
>>>
>>> They are three physical motors. Look at the diagram on the top of the
>>> motor. You would need a special three phase controller if you wanted to
>>> use these. The more common kind of motor is two phase
>>>
>>> On Fri, Mar 23, 2018 at 12:22 PM, Tim Iafolla iafollatim@yahoo.com
>>> [7x12minilathe] <7x12minilathe@yahoogroups.com> wrote:
>>>
>>>>
>>>> Chris, a question about Leadshine if you don't mind: on Ebay there are a
>>>> slew of Leadshine drivers like the one you linked to; and there are also
>>>> Leadshine branded stepper motors like this:
>>>>
>>>> https://www.ebay.com/itm/Nema23-1-5Nm-5-2A-Hybrid-3phase-Ste
>>>> pper-Motor-High-Precision-CNC-Mill-Leadshine/201347932661.
>>>>
>>>> Is there anything special about these motors that makes them work better
>>>> with LS drivers, or are they standard stepper motors with a brand name?
>>>>
>>>> Thanks,
>>>> Tim
>>>>
>>>>
>>>>
>>>>
>>>> On Monday, March 19, 2018, 1:17:31 PM EDT, Chris Albertson
>>>> albertson.chris@gmail.com [7x12minilathe] <7x12minilathe@yahoogroups.com>
>>>> wrote:
>>>>
>>>>
>>>>
>>>>
>>>> Yes those work well but the Leadshine drivers are quite a step up in
>>>> both power and sophistication. And also in price.. This s what I plan
>>>> to use
>>>> www.omc-stepperonline.com/stepper-motor-driver/digital-stepp
>>>> er-driver-18~56a-20-50vdc-for-nema-23-24-34-stepper-motor-dm556t.html
>>>>
>>>> It has features like the Silent Stepstick but
>>>>
>>>> - can handle more current
>>>> - has optical isolators in the control inputs
>>>> - is build into a enclosure that includes a large heat sink and
>>>> connectors
>>>> - includes a 32-bit DSP
>>>> - in can automatically measure resistance and inductance of the motor
>>>> - can run on up to 50 volts, although 36 is typically used.
>>>>
>>>> I'm using an older version of this in the video. The new one above is
>>>> much better.
>>>>
>>>> For even more money there is another class of stepper driver -- "Closed
>>>> Loop.." These have a shaft encoder on the motor and the driver sends only
>>>> enough current to make the motor move as commanded. They increase the
>>>> cost by about 160% but it might be worth later.
>>>>
>>>>
>>>> On Mon, Mar 19, 2018 at 8:23 AM, Malcolm Parker-Lisberg
>>>> mparkerlisberg@yahoo.com [7x12minilathe] <7x12minilathe@yahoogroups.com>
>>>> wrote:
>>>>
>>>>
>>>>
>>>> Chris
>>>>
>>>> If 2A per stepper phase is enough you could use Silent Stepstick drivers
>>>> to prevent the resonances:
>>>> <https://www.trinamic.com/ fileadmin/assets/Products/ICs_
>>>> Documents/TMC2100_datasheet. pdf
>>>> <https://www.trinamic.com/fileadmin/assets/Products/ICs_Documents/TMC2100_datasheet.pdf>
>>>> Ebay have them mounted on a Pololu size replacement module.
>>>>
>>>> Malcolm
>>>>
>>>> I don't suffer from insanity I enjoy it!
>>>> Mene, mene, tekel, upharsin
>>>> The writing is on the wall.
>>>> Ha-ktovet al ha-kir
>>>>
>>>> ------------------------------ --------------
>>>> On Mon, 3/19/18, Chris Albertson albertson.chris@gmail..com
>>>> <albertson...chris@gmail.com> [7x12minilathe] <
>>>> 7x12minilathe@yahoogroups.com > wrote:
>>>>
>>>> Subject: [7x12minilathe] Mini-Mill CNC, First Test of X-Axis.
>>>> To: "7x12minilathe" <7x12minilathe@yahoogroups.com >
>>>> Date: Monday, March 19, 2018, 2:56 AM
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Kind of a milestone with my CNC
>>>> conversion project. I made and installed the first actual
>>>> parts. The X-Axis now can move.
>>>> I soon as I did this fist test I
>>>> thought that someone here might want to just stop at this
>>>> step. It makes an excellent power feed. With no computer
>>>> or other parts I can move the X axis as slow as about
>>>> 0.00015 inches per second and as fast as the entire x-axis
>>>> range in under one second. It is very controllable.
>>>>
>>>> If someone wants
>>>> to make a power feed, if you had the white plastic plate, it
>>>> would be a screw driver only job as it only takes two parts
>>>> and they use existing holes. I can supply the 3/8 thick
>>>> plastic plates at whatever they cost me to make (not much.)
>>>> They some off the printer with M5 treads that work well
>>>> enough to held any NEMA 23 size motor. I did ream them
>>>> out with a tap but I think they work better if you don't
>>>> do that, they were tighter before being
>>>> tapped.
>>>> More comments
>>>> and some video in the link below.
>>>>
>>>> https://albertsonchris. wordpress.com/first-tests-of- x-axis/
>>>> <https://albertsonchris.wordpress.com/first-tests-of-x-axis/>
>>>>
>>>> --
>>>>
>>>> Chris Albertson
>>>> Redondo Beach,
>>>> California
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> #yiv4846184571 #yiv4846184571 --
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>>>>
>>>>
>>>>
>>>>
>>>> --
>>>>
>>>> Chris Albertson
>>>> Redondo Beach, California
>>>>
>>>>
>>>
>>> --
>>>
>>> Chris Albertson
>>> Redondo Beach, California
>>>
>>>
>>
>
>
Posted by: WAM <ajawam2@comcast.net>
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