Solenoids
Solenoids
(OP)
When considering replacing the coils on a solenoid what factors do I consider? Is there a difference between the resistance of an AC and DC coil?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
Download nowINTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: Solenoids
RE: Solenoids
The coil does not know if the applied voltage is ac or dc. Within limits they only care about the magnitude of the input voltage.
A coil designed for 12 vac will operate hotter (and fail quicker) when operated at 12 vdc. A coil operated at 50 Hz will also run hotter that one operated at 60 Hz. The 50 Hz is "closer" to "DC".
The force of the coil is primarily determined by NI. In an ac version the NI's are rapidly changing, thus chatter.
True there will be a surge current, approx 1.5x steady-state, in ac applications but this only occurs for approx 8-10 ms. There must be a low output impedance to the power source to allow pull-in.
The steady-state current (or DC level) provides the heating.