Nihaludeen
Member level 2
Hi friends,
We are designing 3 phase inverter for a long while. Our controller works fine at no load condition when a load attached the controller stucks.
Motor specification:
-500w motor
-500rpm
-13amp rated current
At no load condition..... Works good
- current 1.9amps
- 400rpm
At load condition.... Works bad
- current goes above 20 amps
- 150 to 200 kg load
- Mosfet dies at this condition ( gate to source shorts )
About controller....
- 1kwatts 48v 40amps
- open loop bldc controller
- waveform and rise time,fall time of our controllers images, I will update it.
Is my controller not effectivr to provide a high torque??
Guide my friends, thankyou in advance.
- - - Updated - - -
Waveforms
Motors back emf.... with 120 degree phase-shift
View attachment 151650
Phase to phase with pwm [10Khz] waveform....
**broken link removed**
phase to phase voltage without applying pwm....
**broken link removed**
Timings
Rise time tr= 100ns -200ns
Fall time tf = 50ns - 100ns
BLdc controller design
Feedback is only hall sensor state to drive the phase winding according to the position
commutation sequence
clockwise...
We are designing 3 phase inverter for a long while. Our controller works fine at no load condition when a load attached the controller stucks.
Motor specification:
-500w motor
-500rpm
-13amp rated current
At no load condition..... Works good
- current 1.9amps
- 400rpm
At load condition.... Works bad
- current goes above 20 amps
- 150 to 200 kg load
- Mosfet dies at this condition ( gate to source shorts )
About controller....
- 1kwatts 48v 40amps
- open loop bldc controller
- waveform and rise time,fall time of our controllers images, I will update it.
Is my controller not effectivr to provide a high torque??
Guide my friends, thankyou in advance.
- - - Updated - - -
Waveforms
Motors back emf.... with 120 degree phase-shift
View attachment 151650
Phase to phase with pwm [10Khz] waveform....
**broken link removed**
phase to phase voltage without applying pwm....
**broken link removed**
Timings
Rise time tr= 100ns -200ns
Fall time tf = 50ns - 100ns
BLdc controller design
Feedback is only hall sensor state to drive the phase winding according to the position
commutation sequence
clockwise...
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