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My frequency is 30Khz to 36Khz, I am using Mosfet Irf840 and I am generating frequency from microcontroller in half bridge mode .
I am working an ultrasonic power circuit which must have 50% Duty cycle and power will be 50 watt.
For this i have worked with Irs2110 but not succeed, Here my microcontroller stops working after some time, so i want to go for pulse transformer based circuit.
Hello Friends,
Any one have a good pulse transformer based half bridge driver design?
Please give reference about turns of primary and secondary, Mosfet protection.
I agree with you "partially demagnetized the permanent magnets" can be the reason for motor damage.
But for now i have replaced it, and till now it is working, If problem comes again then I have to come into deep water.
Thank you barry for sharing this much information.
I had not run it more than 10 minute in my complete test.
Motor specification was 3 ampere 18.9 kg/cm.
I run it 4 amp to 5 amp but for test purpose not more than 30 second at a time.
So for this reason can I think My motor was damaged while my testing time.
I had made the drive using two H bridge, using bipolar stepper motors, My job was to drive motor less than 1 rpm, I did it but the motor was taking too much current. So i started choping supply of motor at 458 hz and controlled current by varing duty cycle i got good torque with speed customer...
Thanks to all of you. For now i have solved the problem by changing motor and now it is working.
If the problem comes again in new motor then i will come for discussion about this topic.
Thanks for reply.
Dear Friends but I dont think this case is for Bad bearings I have tried Spray WD40 But problem is there.
I searched on google, and found a line "Mid range resonance " what is this mean ?
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