Locking the movement on an electrical motor 3

[Gustavo Silvano]

Hello there!

I'm an electrical engineer and I just mounted a new machine on my industrie. It's composed of a motor turning a shaft. This turn is made when the operator press a button. But due to the inertia of the shaft, when the motor stop spinning, the shaft make a half of a turn. And this is caused by the fact that the motor does not have a break.
This inertia was not taked into account when I was making the project for this improvement, but I want to fix it without changing the motor. Is there a way to do this? An electrical or mechanical one?
I don't know if it's necessary, but here's the project that was implemented.

Best regards.

Gustavo

 

[GroovyGuy]

Hi s,
The first project that I worked on was a re-and-re of major substations in a refinery. This was way back in the mid 70's so some of the details are a bit fuzzy. But I do recall installing dc-injection braking modules on cooling tower fans. These modules were to prevent a stopped fan from running backwards due to backdraft caused by adjacent fans running. The modules were also used to provide anti-condensation heat in the stator winding, which is a bonus in such a damp environment. These modules were built by Allen Bradley, but I haven't seen any since the late 70's. (I'm sure that Others can provide a similar solution).

Is there any chance of installing an ASD? A 4-quadrant ASD (ie active FE) would be the ultimate solution, but any ASD can be fitted with a braking resistor. Any ASD could be made to work, plus you get the usual advantages of having an ASD in-situ. An ASD option might even be less expensive than monkeying around with an electric brake.

GG


"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)

 

[Skogsgurra]

Jeff 22 Sep 17 19:53

Oh, is that a Hotdog? I thought that this guy had had an accident and now thinking about how to re-attach his pinky.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[GroovyGuy]

Howdy Gustavo,
FYI: I was just perusing a few VFD manufacturer web-sites and discovered that many of their products come (standard) with braking systems using dc-current-injection. Check out the Yaskawa and Toshiba web-sites. Depending on the motor size, this might be less expensive that trying to retrofit an electro-mechanical brake to an existing system.
GG

"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)