Hi, I have a question regarding the fail-safe electromagnetic door locks. I understood that DC...
electromagnets weaken over time (because their energy translates into heat), as opposed to AC electromagnets. I assume that the DC door locks on your website don't suffer from this. How come?
I am not an electrical engineer and can only provide anecdotal information.
The information I can offer in answer to your question is this: There are no AC electromagnets that are used in access control applications as electromagnetic locks. There are a very few AC electromagnetic coils used in electric strikes. An AC electromagnetic coil changes polarity at a certain frequency when energized. For example, an AC electric strike used with a step down AC transformer reducing voltage from standard 115v line current in the United States changes polarity 60 times per second, causing the strike to buzz a steady b flat. Because an AC electromagnetic coil vibrates at 60 cycles per second, it cannot be used in a fail safe or continuous duty application because it will buzz constantly until it burns itself up with the friction of the solenoid plunger.
From experience, I have known DC electromagnetic locks to be in operation for 20 or 30 years, so your assumption that they do not weaken over time may be correct. More likely they weaken, but not significantly enough to affect their performance or set off their own bond sensor alerts.
by Faith Reaper 3 years ago
For those who believe the Bible is the infallible word of God, regarding Hebrews 10:26-27 ...What exactly does the following scripture mean to you? "For if we go on deliberately and willingly sinning after once acquiring the knowledge of the Truth, there is no longer any sacrifice left to...
by pippap 8 years ago
Why do so many people vote down an answer regarding God and religion when the answer is simply theopinion of the responder?I answered the question, "What brings you pure pleasure?" with "I am truly happiest when I am in the wilderness alone with my God and my thoughts. Contemplating...
by Credence2 12 months ago
Just wondering, why is the Trump Administration so tight lipped on the question?
Copyright © 2018 HubPages Inc. and respective owners. Other product and company names shown may be trademarks of their respective owners. HubPages® is a registered Service Mark of HubPages, Inc. HubPages and Hubbers (authors) may earn revenue on this page based on affiliate relationships and advertisements with partners including Amazon, Google, and others.
|HubPages Device ID||This is used to identify particular browsers or devices when the access the service, and is used for security reasons.|
|Login||This is necessary to sign in to the HubPages Service.|
|HubPages Traffic Pixel||This is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.|
|Remarketing Pixels||We may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.|
|Conversion Tracking Pixels||We may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.|