- Problem with Tekpower PSU - 1 Update
- can bad cap = hot motor? - 5 Updates
| bitrex <user@example.net>: Aug 15 08:46PM -0400 On 8/15/2020 11:00 AM, legg wrote: > contact trace problems. > ? > RL Thanks legg, I'll check those. |
| Paul Drahn <pdrahn@jodeco.com>: Aug 15 10:20AM -0700 > replace the cap. > Thanks, > Eric I suspect your motor has a single capacitor and is a split-phase motor. Cap start, cap run requires two capacitors and the mechanism to switch between the two. A grinder has no reason the have a heavy load when it starts, which is the reason for motors with two caps. Paul |
| Fox's Mercantile <jdangus@att.net>: Aug 15 01:33PM -0500 On 8/15/20 12:20 PM, Paul Drahn wrote: > A grinder has no reason the have a heavy load when it starts, which is > the reason for motors with two caps. Well, actually it does. It has the inertia of both grinding wheel to get up to speed. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
| whit3rd <whit3rd@gmail.com>: Aug 15 01:48PM -0700 On Saturday, August 15, 2020 at 11:33:43 AM UTC-7, Fox's Mercantile wrote: > > the reason for motors with two caps. > Well, actually it does. > It has the inertia of both grinding wheel to get up to speed. The motor could certainly get it up to speed fast with a high torque, but the user of a grinder can wait a few seconds before applying his workpiece... so "low startup torque" :== "low startup load" is acceptable in this application. |
| etpm@whidbey.com: Aug 15 02:19PM -0700 On Fri, 14 Aug 2020 19:56:04 -0400, Ralph Mowery >> Eric >Not likely, but if one of the windings is shorted to ground or the >capacitor is leaking to ground the current could be different. I guess the cap could indeed be leaking to ground. It has a brass case after all and the case may be touching metal. I will be replacing the cap and that will hopefully solve the heating issue. I'm certain it will speed up the startup. Eric |
| Ralph Mowery <rmowery28146@earthlink.net>: Aug 15 05:43PM -0400 In article <cc120e40-5b93-49c8-baca-e1d672541cf2o@googlegroups.com>, whit3rd@gmail.com says... > The motor could certainly get it up to speed fast with a high torque, > but the user of a grinder can wait a few seconds before applying his > workpiece... so "low startup torque" :== "low startup load" is acceptable in this application. I doubt the grinder really has that much inertia to prevent starting. It may tke some time to get up to full speed. Most hard starting is like air compompressors and refrigeration compressors unless they have some sort of unloader. |
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