Bipolar Stepper Motor : one step CW and one step CCW ???

Other Hardware Motors, Mechanics, Power and CNC
1

Hi Friends Helpers,

For a microphotography project, I bought a stepper motor Nema 14 that could work with a voltage between 8 and 45 V.
I found the two winding with an electric controler.
The problem came when I tried to make connections to see how it turn :
For exemple when the first winding(A) is connected, it moves clockwise (CW). Then connecting the second winding (B) generates a counter clockwise move, or no move. Reversing the polarity of the wires in B, does not solve the problem.

Have you any idea of the problem ?
Sincerely

Michel
Taochez@orange.fr

2

What motor?

What controller?

Links to datasheets or similar please, as you have been asked if you read the
"read before posting" sticky thread.

If you are hand-connecting a stepper to a controller you should realise that
disconnecting a motor or winding from a powered-up motor controller is
a good way of killing the controller dead. Always power down before connecting
or disconnecting motor wires from a stepper controller.

If you want to understand how stepper motors work, there are many
resources out there for that.

3

Hi MarkT,
I am planning to use a DRV8825 controller, but I wanted to check the rotation of the motor before going further. This checking to be sure that the wiring is correct. But for the moment, I just want to obtain at least two steps in the same direction CW or CCW.

The motor is a Nema 14 :
Stepper Motor: Bipolar, 200 Steps/Rev, 35×28mm, 10V, 0.5 A/Phase Pololu item 1208: Stepper Motor: Bipolar, 200 Steps/Rev, 35×28mm, 10V, 0.5 A/Phase

Sorry if I am not very clear...
Many thanks for your help

Michel

4

Post your code. and a schematic

5

Taochez:
Hi MarkT,
I am planning to use a DRV8825 controller, but I wanted to check the rotation of the motor before going further. This checking to be sure that the wiring is correct. But for the moment, I just want to obtain at least two steps in the same direction CW or CCW.

The motor is a Nema 14 :
Stepper Motor: Bipolar, 200 Steps/Rev, 35×28mm, 10V, 0.5 A/Phase Pololu item 1208: Stepper Motor: Bipolar, 200 Steps/Rev, 35×28mm, 10V, 0.5 A/Phase

Sorry if I am not very clear...
Many thanks for your help

Michel

Connect the motor to the driver, set the current level appropriate for the motor, check
your circuit carefully before powering up.

Trying to step a stepper by hand from a supply is tricky and you'll likely get
a nasty shock and may damage your power supply unless its a battery. So long as
both windings are intact (measure with a multimeter) and the shaft turns then
it will function.

6

the motor has two coils.

you have to create a dual h-bridge to test.

coil A has two leads, call them A1 and A2
coil B has two leads, call them B1 and B2

here is the sequence:

A1 5v, A2ground
all circuits open
B1 5v, B2 ground
all circuits open
A1 ground, A2 5v
all circuits open
B1 ground, B2 5v
all circuits open

this will full step in one direction.

needs 4 pins out of the arduino and two PNP and 2 NPN transistors.

for half step, and a smoother movemetn, but at more power....

A1 + ; A1 gnd
then...

A1 + ; A1 gnd
B1+ ; B1 gnd
then

Acoil open

then

B1+ ; B2 gnd
A1 gnd ; A2 +

then

b coil open.

each coil goes positive, then negative and each conditions alternates between one coil and two coils.

7

I am using Arduino ATMEGA 2560 microcontroller board, STA401A Stepper motor driver and PM42L-048-SYP6 stepper motor. I want to know about the circuit diagram and the program for checking the stepper motor. If any one knows, please reply me soon.

8

I hope the Thread stepper motor basics will be helpful. It includes a link to some simple code that I use for testing.

...R