topic Re: MPC5744P MBDT Motor Encoder in Model-Based Design Toolbox (MBDT)

MPC5744P MBDT Motor Encoder

C_Zuercher_APR — Tue, 23 Mar 2021 12:26:59 GMT

Hi,

I'm currently using a motor encoder to monitor the position of a BLDC motor, however at high motor speeds (circa 1,400rpm or so) the board appears to be unable to read the encoder. I'm using a 1,024 line encoder and am thinking that perhaps the line resolution is too high, or is my programming unsatisfactory for this task (I've attached the model to this post)?

FYI, I've worked out that the subroutine used to calculate the rotor position is being executed every 1.5e-5 seconds at 1,000 rpm.

Thanks in advance for your help,

Crispin

Re: MPC5744P MBDT Motor Encoder

adriantudor — Thu, 25 Mar 2021 10:52:26 GMT

Hi @C_Zuercher_APR ,

We have an example for a motor encoder using MPC5744P. You can find it in examples or get it from here.

We use Etimer in Quadrature count mode and we count the pulses at a fixed period of time. And from here you can calculate the motor speed. Try to start from this example.

Best regards,

Adrian

Re: MPC5744P MBDT Motor Encoder

C_Zuercher_APR — Fri, 26 Mar 2021 07:05:35 GMT

Hi @adriantudor

Thanks for this; now works perfectly!

Thanks,

Crispin