A disable pin is an enable pin – just with negative logic – in fact this chip has two enable pins, one is a true enable negative logic disable and one a disable negative logic enable. Robin2 on Nov 27, , The MC actually has an enable and a disable pin, you could trace where they go to on the board? Like I said earlier, I’m fairly new to electronics. Help with MC Motor Controller!!! Two or three hours spent thinking and reading documentation solves most programming problems.
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That’s how you learn what mcc33886 pin does. MarkT on Nov 26, Go to the MC datasheet and read it. With floating states of the outputs the system has more complex behaviour as the voltage across the winding isn’t completely defined, merely bounded. The only pins I see are the corresponding input pins, vcc, and gnd.
It all depends on how many of the possible states of the 4 switching devices can be commanded.
1pcs Dual Mc33886 Motor Driver Module 5a for Robot Smart Car
Usually copper losses dominate anyway, so the effect isn’t massive. My problem is figuring out how to control the speed of the motor.
I’m reading it and I still can’t figure it out. You can use Pin2 Fault Status to detect faults if you wish.
MC Dual Motor Driver | Open ImpulseOpen Impulse
Iron losses are magnetic losses whenever the magnetic field in the laminations reverses. The Pololu DRV is motlr example. MarkT on Nov 27, For each bridge you would normally PWM one signal and hold the other low to give speed control, swap pin roles for the other direction.
DuaneDegn Edison Member Posts: MarkT Brattain Member Posts: Like I said earlier, I’m fairly new to electronics.
MC33886 Dual Motor Driver
Robin2 on Nov 27, Help with MC Motor Controller!!! High PWM frequencies don’t require complete magnetic reversal, note, the inductance of the winding limits the change in current and thus change in magnetic field, and thus iron losses are not simply proportional to frequency.
This chip doesn’t allow either output to float so you get synchronized rectification mode only, but means you still have 4 quadrant control, at the expense of a little more dissipation due to iron losses. A disable pin is an enable pin – just with negative logic – in fact this chip has two enable pins, one is a true enable negative logic disable and one a disable negative logic enable.
Thank you for you’re help!
So long as the PWM frequency is high enough. For motion control this is what you need, as the response is basically linear to the drive PWM making control loops more stable and predictable.
Help with MC Motor Controller!!!
Read 1 time previous topic – next topic. However you can play tricks with lower PWM frequencies and lower iron losses in the motor.
The inputs map one-to-one with the outputs so you should be able to do most things except coasting. For some odd reason, this one doesn’t. DuaneDegn on Nov 27, Mc3386 is exactly is that pin?
DuaneDegn on Nov 26, Two or three hours spent thinking and reading documentation solves most programming problems. I have not read enough to know what faults are reported. Some motor drivers expect a PWM moor on one input or on the other input depending on the direction you want the motor to move.