how to find the step angle of 4 phase stepper motor with the four inputs

[24848702]

Dear sir,

 I have a 4phase unipolar stepper motor. I need to find the angle , speed and direction of the stepper motor. consider that its step angle is 1.8 degrees. How I can determine using digital logic. because my board possess FPGA and cPCI .

[24848702]

Dear sir ,

 I have a stepper motor which is a 4phase unipolar with a step angle of 1.8 degrees. How can I measure the speed, angle in (absolute form)

and direction of the stepper motor. Details given, only four inputs with a sequence of 1000,0100,0010,0001,1000 so it continues to run the stepper , with these inputs , how can i measure the above mentioned.We are going to use an FPGA for the logic circuits. So please give me some idea in acheiving those parameters.

Thank you sir,

regards,

vinoth

[24848702]

Dear sir,

I did not get what is this forum, I need to pay for the discussions or its free, I got a call from one of your engineer, he clarified me its better if u send me through mails, why I couldn't get properly in telephone, so If u give me the details through mails and  its more than enough.Also this discussion is only for those who use the NI labview or its common for every one.

Please clear me ,

Thank you sir,

[Jason N]

Vinoth,

These forums are open to anyone and are completely free.  Anyone is free to post and anyone can reply and help answer questions.  Regarding your question on finding the position, velocity, and angle of your stepper motor, what type of equipment are you using to drive and control the motor?  A great way to monitor all of these parameters is through the use of an encoder.  All of these parameters can be derived from the encoder pulses will the proper hardware and software.  Please let me know.

Jason N

[24848702]

Dear sir,

             First of all, I would like to thank to NI for giving this oppurtunity regarding Technical discussions. More over I would like to thank to You sir. Actually we are not going to load the stepper motor, the inputs to the driver is given by some one, and those inputs will be taken through OPto isolator(till now we didn't any opto coupler), and those i/ps consider A,B,C,D will have the sequence of 1000,0100,0010,0001,1000 and these sequence will continue for rotating the stepper motor. So we are using an FPGA which will read these inputs and it is going to perform the simulation operation, it means it is going to measure the speed, angle(absolute), direction(FWD,REV), Currently we are planning to load with RLinstead of stepper, so there is no chance of using encoder here, so give me some ideas in implementing these parameters with FPGA and ideas about those parameters,so that I can proceed further. Also through FPGA it will be given to cPCI back plane ,

spec:

stepper: 4phase stepper 28V

step angle: 1.8 degrees.

Drive system : Unipolar(consider wave drive.)

Stepping method: (Both Half & Full stepping)

Once again I would like to thanks to you sir.

Thanks,

[24848702]

Dear sir,

I've been asking the idea of determining the step angle, speed and direction of the stepper motor,using FPGA, till now I didn't get any ereply.

please give me some ideas about this, also our project is " stepper motor simulator" is there  any module which will simulate all these parameters of stepper motor. please reply if NI has any equipment which will silumate the parameters of stepper motor.

Thanks

[Jason N]

Vinoth,

It sounds like you are setting up quite a custom system!  The way that I will really be able to help you is if you are using any National Instruments products.  For motion applications, my expertise is interfacing 3rd party equipment with NI equipment and configuring the NI equipment.  Are you using any NI hardware or software in this project?  As far as the actual logic of your program I can give you some ideas to start with, but I cannot help you with the development process. 

What are the specifications you require for the stepper motor signal simulations?  For instance, do you need a TTL signal, what is the maximum frequency you would need, do you need PWM capabilities, etc?  Depending on your exact requirements, I can recommend some NI hardware that would be able to simulate your motors. 

Jason N

[24848702]

Dear sir,

             Thanks for giving me a suggestion,I want to know about NI products, Is there any simulator for stepper which is done by NI. We want a simulator which will test the functionality of stepper motor. We have only the 4 phase 28v stepper motor, with those inputs the simulator has to find the direction, speed and angle , also it should have limit switches for high and low.So if you have any products based on these parameters which is given above,please inform to us immediately.

thanks 

[Jason N]

Vinoth,

NI would not have a specific simulator for a stepper motor.  Think of NI's products as tools that customers can use to build a setup of hardware and software to meet their specific requirements.  NI has motion control products that allow to control and monitor the position of stepper motors and servo motors.  There are also Data Acquisition products that allow to read an write digital, analog, and counter/timer signals.  Combining these products with software such as LabVIEW, specifically the DAQ products, would allow you to create a "stepper simulator".

I have a few more questions for you.  Do you need equipment to actually drive the servo motor and control its position, or are do you need equipment that will actual output signals that mimick the outputs of a servor motor?  Please let me know as this will determine the NI products that would fit your needs best.

Jason N

[24848702]

Dear Jason,

                  Actually my motor is stepper not servo motor, I've only four inputs which is going to the stepper  motor with the drive freq of 800 hz and 400 hz, with those inputs , I need to find the absolute angle,plz give me some suggestions for finding the absolute angle.