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Bipolar stepper driving ?

H

Hammy

Jan 1, 1970
0
I have some steppers (bipolar 4-wires) from printers I would like to
test.

This is the motor I'm trying to test.
http://i40.tinypic.com/3532vrk.png

Full motor datasheet
http://www.mitsumi.co.jp/Catalog/pdf/motor_m42sp_6nk_e.pdf

I bought some Toshiba LDMOS bipolar drivers TB6598FN.
Typical application. This is my schematic exactly the same.
http://i43.tinypic.com/2kkh8n.png

Simplified block diagram of driver.
http://i43.tinypic.com/2gx3add.png

Truth table
http://i44.tinypic.com/2i0asl0.png

Full Datasheet TB6598FN
http://www.semicon.toshiba.co.jp/do...IC/TB6598FN_TB6598FNG_en_datasheet_060306.pdf

The motors are getting a regulated 12Vdc and the driver gets 5Vdc.

My questions.

From the datasheet for best performance my control signals should be
about 400Hz? 50% or less duty?

How should my control signals be for forward stepping?

The truth table just shows EN1&2 high,IN1&2 LOW. If I pulse IN1&2
they will go from forward to reverse and back again.

What should the sequence be to the four control pins for simple
forward stepping?

I'll be using a PIC probably just 12f508 for my control signals.
 
H

Hammy

Jan 1, 1970
0
Use a H-bridge to allow either polarity across each winding.
Call winding 1 "vertical" A to B; winding 2 "horizontal" C to D.
Try A-B, A-B & C-D, C-D, C-D & B-A, B-A, etc; opposite direction for
opposite motion.

The TB6598FN is a dual H-BRIDGE IC.

The problem is they show one "EN" and one "IN" line going to each
bridge or actually they show it going to a box labelled bridge.

http://i43.tinypic.com/2gx3add.png

I know I have to pulse each arm in sequence but what is what from the
diagram?

They don't say which line controls which N-channel and P-Channel
combo. The truth table is even more confusing they say if EN1&2 are
high and IN1&2 are low the motor will move in the forward direction. I
dont want to pulse one bridge for forward movement and then pulse the
other one for reverse.

I'm trying to figure out the sequence I would have to pulse the four
control lines for forward rotation.

http://i44.tinypic.com/2i0asl0.png
 
The TB6598FN is a dual H-BRIDGE IC.

The problem is they show one "EN" and one "IN" line going to each
bridge or actually they show it going to a box labelled bridge.

http://i43.tinypic.com/2gx3add.png

I know I have to pulse each arm in sequence but what is what from the
diagram?

They don't say which line controls which N-channel and P-Channel
combo. The truth table is even more confusing they say if EN1&2 are
high and IN1&2 are low the motor will move in the forward direction. I
dont want to pulse one bridge for forward movement and then pulse the
other one for reverse.

 I'm trying to figure out the sequence I would have to pulse the four
control lines for forward rotation.

http://i44.tinypic.com/2i0asl0.png

it isn't best datasheet I've seen, but it is clear what the pins
does.

EN1/2 pins enable or disable the h-bridge, when low all transistors
are off.

IN1/2 pins control the h-bridge when the EN1/2 is high.

just so set EN1 and EN2 high and toggle IN1 and IN2

IN1: 110011001100
IN2: 011001100110



-Lasse
 
H

Hammy

Jan 1, 1970
0
it isn't best datasheet I've seen, but it is clear what the pins
does.

EN1/2 pins enable or disable the h-bridge, when low all transistors
are off.

IN1/2 pins control the h-bridge when the EN1/2 is high.

just so set EN1 and EN2 high and toggle IN1 and IN2

IN1: 110011001100
IN2: 011001100110



-Lasse

Thank you

I wasnt sure.
 
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