Hi I would like help in the construction and translation of a schematic circuit diagram for a DC brushless control motor.
The system highlighted in this project here is built on the MC33035 and a support chip which is the MC33039.
These IC’s are examples of ICs that can dramatically simplify the design of the brushless motor control systems thus reducing the required circuit board area and parts count.
The aim of this project is to design, construction and test a controller through the provision of a closed loop feedback system with the capability of driving a 24 V brushless direct current (BLDC) motor.
Does anyone have an idea? Any help would be appreciated.
Yes that is the schematic. I understand how it works but I do not have the experience to build it on the pcb vero board. The schematic layout on the sheet has a different layout than if it was on the pcb Vero board hence my need for help in the physical layout such as planning and positioning of the power supply, the ground and general component positioning and logistics on the board.
One youtube (see comments) claims that schematic does not work as is and requires modifications. I can lay it out on eagle if that is any help though I think it would be wiser to get it working on a protoboard first.
I am now checking out the You tube video you just sent me. It does not explain what modifications were made unfortunately.
I would certainly appreciate the layout on eagle software if you do not mind. It would at least go a long way in helping me out.
In regards to testing it on a protoboard, do you mean a breadboard?
The maximum stating torque of the motor is 5.4 Amps and sometimes the initial currents surge to 3 times the maximum current in order to provide that initial torque. The breadboard only has a limitation of about 1 Amp. The Motor will therefore too much current than the breadboard will be able to handle or provide given it’s limitations. I am therefore not so sure if it will provide the necessary amount of current needed to make it begin to run hence the reason I got PCB’s.
I guess there is low current section which includes the MC33035 and MC33039? Maybe that part could be assembled on a breadboard then the rest on a PCB? I’ve worked with PID temperature controls separated that way in the design stage, triacs on PCB and everything behind opto-coupler on breadboard.
Yes I am a member. I paid but do not have a key yet.
I wanted to ask you a few things, if one was to use a breadboard for the test of the schematic, won’t one need heat-sinks for the MOSFETs? How would you go about with the design?
Secondly how easy is it to use the eagle software? And deigning the circuitry, how quick and cheap is it to fabricate it? Do you know how much it would cost?
Will you be in the workshop today and at what time?
My guess is the MOSFETs will need heat sinks. They can be made with aluminium profiles such as curtain rails, or bought.
The way I design is first get it working on breadboard, then layout on eagle, then move components around until they fit in the smallest possible area, isolating DC and AC sections when applicable.
Eagle is not hard to use. You basically have a schematic and a board layout. The board layout has an auto-route function that theoretically does all the work for you though I prefer to do it manually.
I would expect a working prototype to take around 20 hours’ work. Once you have a working version you could then have it manufactured by a number of fabrication houses around the world. If memory serves me right, London Hackspace had 500 2" x 2" boards done by a company in Scotland for the first EMF and I think they turned out £5 each assembled.
I won’t be in the workshop today. Can do a few hours this weekend, Saturday or Sunday.