Sujet : Re: Motor Speed Control
De : kevin_es (at) *nospam* whitedigs.com (KevinJ93)
Groupes : sci.electronics.designDate : 08. Mar 2024, 20:30:09
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <usflfg$1rk9q$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11
User-Agent : Mozilla Thunderbird
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:
..
>
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