inverter output voltage problem

hello,

I am using the official program "Vector Control of Three-Phase Induction Motor Used in Driving a Pump RX66T Implementation Rev.1.10 - Sample Code". I want to adjust the output voltage of the inverter to 220V. However, if I want to adjust the output voltage to 180V, which part of the program should I modify? I think it is the modulation factor mentioned in this file  page 13, but I can't find the relevant place in the program. How can I achieve 180V?

file:

https://www.renesas.cn/cn/zh/document/apn/vector-control-three-phase-induction-motor-used-driving-pump-rx66t-implementation-rev110

Best Regard,

eva

Parents
  • Hi eva.

    My understanding is that by changing the output voltage of the inverter, which is the input voltage to the motor, you mean to change the speed. For that, did you try the following function present in the file mtr_3im_less_foc.c? 

     

    If I've misunderstood your question, do let me know!


    Regards,
    Jayesh 

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  • Hello Jayesh,

    You are right that I am changing the output voltage of the inverter, which is also the input voltage of the motor. However, I am not changing the voltage to change the speed of the motor. Instead, I am changing the voltage because the rated voltage of the motor I am driving is 180Vac. Therefore, I need to change the output voltage of the inverter. That's why I want to know which part of the program I need to change to achieve an output of 180Vac.

    Regards,
    Eva

  • Hello dear Eva, sorry for the delayed response. 

    I strongly recommend you check out the motor control algorithms first,
    RX66 devices can do complex motor control algorithms, but I'm not sure if it's useful for your motor type and requirements. 


    The sample code uses the Vector control method, it's mathematically complex (at least for me) and without having a great foundation of its algorithm I don't think you can adjust it properly. 

    If you need direct control of the Voltage and frequency of the motor, you need to implement the V/F control method, which is simpler and easier to implement. but you might not find an example of it for the RX series. 
    Although the output voltage and current are controlled by the modulation factor, in the vector control method, we're not capable of controlling that directly and it's under the control of the application. and the application takes control of the speed and torque of the motor. if your motor is strictly recommended not to be fed by higher voltages, you need to adjust the DC bus voltage or use the V/F control algorithm instead of vector control. 

    Please check out the documents below if you haven't yet

    Vector control algorithm of three-phase induction motor 

    https://www.renesas.com/us/en/document/apn/vector-control-three-phase-induction-motor-algorithm

    V/F control algorithm of three-phase induction motor 

    https://www.renesas.com/us/en/document/apn/vf-control-three-phase-induction-motor-algorithm

    I hope you find this useful.
    Best regards. 

    Hossein. 

    If this or any other user's response answers your concern, kindly verify the answer. Thank you!

    Renesas Engineering Community Moderator
    https://community.renesas.com/
    https://academy.renesas.com/
    en-support.renesas.com/.../

     

Reply
  • Hello dear Eva, sorry for the delayed response. 

    I strongly recommend you check out the motor control algorithms first,
    RX66 devices can do complex motor control algorithms, but I'm not sure if it's useful for your motor type and requirements. 


    The sample code uses the Vector control method, it's mathematically complex (at least for me) and without having a great foundation of its algorithm I don't think you can adjust it properly. 

    If you need direct control of the Voltage and frequency of the motor, you need to implement the V/F control method, which is simpler and easier to implement. but you might not find an example of it for the RX series. 
    Although the output voltage and current are controlled by the modulation factor, in the vector control method, we're not capable of controlling that directly and it's under the control of the application. and the application takes control of the speed and torque of the motor. if your motor is strictly recommended not to be fed by higher voltages, you need to adjust the DC bus voltage or use the V/F control algorithm instead of vector control. 

    Please check out the documents below if you haven't yet

    Vector control algorithm of three-phase induction motor 

    https://www.renesas.com/us/en/document/apn/vector-control-three-phase-induction-motor-algorithm

    V/F control algorithm of three-phase induction motor 

    https://www.renesas.com/us/en/document/apn/vf-control-three-phase-induction-motor-algorithm

    I hope you find this useful.
    Best regards. 

    Hossein. 

    If this or any other user's response answers your concern, kindly verify the answer. Thank you!

    Renesas Engineering Community Moderator
    https://community.renesas.com/
    https://academy.renesas.com/
    en-support.renesas.com/.../

     

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