Re: Motor Speed Control

On 3/7/24 7:18 PM, John Larkin wrote:

On Thu, 7 Mar 2024 12:13:59 -0800, KevinJ93 <kevin_es@whitedigs.com>
wrote:
 

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>
Stepper motors are invariably of the reluctance type. With simple
drivers they have a great deal of cogging, which is undesirable in a
capstan drive motor.

 There are two types, PM and VR. PM steppers use bipolar coil drive and
have a strong unpowered detent. And can act as generators.

Yes, I was wrong.

Both can microstep nicely, for smooth motion.
>

Given appropriate driving circuitry that would have been expensive and power consuming in 1970.

 

>

ESCAP did do a range of small stepper motors where a sine wave drive did
give a uniform rate of rotation - with others you had to massage the
waveform a bit to get uniform rotation.

>

..
kw