True, but that would be to control arcing over the contacts and lower electrical noise, but is unrelated to the frequency of the horn.Though there may be a capacitor across the contacts.
Absolutely.True, but that would be to control arcing over the contacts and lower electrical noise, but is unrelated to the frequency of the horn.
Please be advised that, as a practical matter, electrical resonance is immaterial to operation of the described device...I needed help in understanding the L,C,R relationship for the coil in
There will be no 'inrush surge' in the 'traditional' sense of the term -- howbeit the mean current will 'settle' to less than E[applied]/R[coil] owing to the sub-unity duty cycle corollary to periodic interruption of the circuit (at the AF rate of the buzzer)...Any clue about the inrush spike, when supply is turned on
Coil heating (with subsequent resistance rise) will be negligible in a properly designed EM buzzer operated as per specification....and the increase in overall resistance of the horn
Talk to the engineers where you work assuming/hoping you're not one.Hey All! I am a new joinee at a car horn manufacturing factory,
Any clue about the inrush spike
HP I say maybe TS thinks there is current surge when connecting horn cuz he/she is confusing high voltage arc from inductive kick with drawn arc from interrupting high current (during _bounce_) cuz they can look the same!There will be no 'inrush surge' in the 'traditional' sense of the term
You can measure the DC resistance of the coil,Yes Aleph(0), every time the horn is switched on there is a surge apart from the EMF generated, I plan to analyse this on an oscilliscope.
But need general pointers to good design to keep the surge as well as emf low without using the capacitors or diodes to reduce manufacturing costs.
HP, these horn are designed to work for 100,000 cycles (1second one and 2 second off) without need for adjusting the contacts
It seems you misunderstood my reply (my bad) -- To wit, upon application of power, current is equal to EMF[PSU]/Resistance[coil] which being 'mitigated' by instantaneous (inductive) reaction followed by attainment of a (lower) 'mean' as per the switching duty cycle (i.e. the ratio of 'contacts closed' to 'contacts open' times) attending the mechanical oscillation of the diaphragm.HP, these horn are designed to work for 100,000 cycles (1second one and 2 second off) without need for adjusting the contacts
Given your conditions, increased coil resistance is about your only means to that end (not likely an economically competitive solution) - In any case, effective transient suppression is essential is damage to semiconductor components (elsewhere in the electrical system) to be avoided!But need general pointers to good design to keep the surge as well as emf low without using the capacitors or diodes to reduce manufacturing costs.
Aye! But be advised -- It'll require a BIG coil inductance to 'tune' the distributed/incidental capacitance to Ca. 4ooHz!You can measure the DC resistance of the coil,
you can measure the capacitance of the horn.
From those valuves, propose a circuit and mH rating of the inductor that is needed to resonate at 350 to 400 Hz.
HP I agree! cuz it would take like 160 HENRIES of inductance to resonate with 1nf (which I say is liberal estimate) of stray capacitance at 400hz! And then anyhow the Q would be so low it wouldn't matterAye! But be advised -- It'll require a BIG coil inductance to 'tune' the distributed/incidental capacitance to Ca. 4ooHz!
Best regards
HP
You could make it with cool superconducting wire??Anyhow then the Q would be so low that it wouldn't mater
AlbertHall you got me there! But I say it's just more economical to use snubber diode and point buffer capYou could make it with cool superconducting wire??
Yeah, but it's not so much fun.But I say it's just more economical to use snubber diode and point buffer cap