In another thread I was working on setting up 3 phase control of a linear motor (.35A @ 6V) using a Mega and some transistors. The idea is that this would behave like a very slow BLDC motor.
I think that the forum helped me get a diagram that is close to workable. Thanks for all the help.
On that thread I got a suggestion from user westfw to consider using a chip with half h-bridges, like the l293d, to simplify the component set.
I read the data sheet and have some questions. Is this list accurate?
- if 1,2EN is high and 1A is high, 1Y will be Vcc_2
- if 1,2EN is high and 1A is low, 1Y will be ground
- if 1,2EN is high and 2A is high, 2Y will be Vcc_2
- if 1,2EN is high and 2A is low, 2Y will be ground
- if 1,2EN is low, 1Y and 2Y are high impedance
I do need to have each phase of the motor be high, low and disconnected at various points in the cycle.
I am thinking of applying a digital signal to the motor in to determine polarity, and a PWM to the various enable pins to turn the power on or off to the phase.
Does that make sense?
Using my limited knowledge of these chips, here is what I came up with. Please critique.