IMC102T-F064 speed control via UART issue - Motor speed doesn't change.

[sudip_k]

Hi,

I am able to run the motor via UART1 by giving the command "0x01, 0x03, 0x00, 0x00, 0x01, 0x01, 0xFE, 0xFB " (to run at 275RPM). But the motor runs at lower speed at 100RPM aprox. 

Even if I give another speed command "0x01, 0x03, 0x00, 0x00, 0xE8, 0x03, 0x17, 0xF9" to run at 1000RPM, it still runs at the same 100RPM. However, I am able to stop the motor by giving the command "0x01, 0x03, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFC "(0RPM).

I cant control the speed of the Motor it always runs at the same low RPM. Please help!

Device used: EVAL-M3-102T

[ninad_w · Accepted solution]

Hi @sudip_k ,

Please refer to the Motor speed scaling factor from the Table 26 Variable Scaling Table from software reference manual 

https://www.infineon.com/dgdl/Infineon-MCESW-RM-UserManual-v01_03-EN.pdf?fileId=5546d462719b59230171...

According to the SRM, actual target speed factor is as follows:

Motor RPM = (𝑀𝑎𝑥𝑖𝑚𝑢𝑚 𝑆𝑝𝑒𝑒𝑑 / 16384 ) * (target speed)

The maximum speed is the speed configured in the MCEWizard (question number 8: Motor max RPM).

Please change the target motor speed to some higher value so that the motor speed can easily be observed.

Thank you!

Best regards,

Ninad

[sudip_k]

Hi, 

My requirement is that the motor must not exceed 1500RPM. So I set "1500" as my Motor Max RPM(in question no8). 

So lets say, if I set my target speed via UART = 500

Based on the equation,

Motor RPM = (1500/16384) * 500

                       = 0.091 * 500

                     = 45 RPM

Is that right?

If not please use an example to explain.

[ninad_w]

@sudip_k 

Yes, it is correct. Based on the equation and values you have entered you will get motor RPM as 45.

Thank you,

Best regards,

Ninad