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TM4C123GH6PGE: Regarding the BLDC motor

Srinu Vakada
Intellectual 770 points

Part Number: TM4C123GH6PGE
Other Parts Discussed in Thread: LM3S1627

Hello everyone,

Thanks to everyone for suggesting in my previous posts.

          I am working on a new project which is completely based on my previous project. In my previous application, we are using TM4C123GH6PGE microcontroller for controlling the 3-phase AC induction motor, in that we are using PWM technique and space vector modulation for converting input DC voltage to 3-phase AC. By using hardware we are sensing the 2-phase currents and applying to the motor inputs.In that we are using VFD (V/F) techniques for controlling the speed of the motor.

So now i want to replace the 3-phase induction motor to BLDC motor (requirement from client site). So i eagerly know that i can apply same hardware specification with TM4C123GH6PGE microcontroller.

If yes,  what kind of changes required in software and hardware for operating and controlling speed of the BLDC motor.

If No, then what i have to do to solve this problem. I request you to please suggest me clearly about hardware and software changes if required.

Thanks,

Regards,

Srinu.V.

  • 0
    Guru 117855 points

    Srinu Vakada said:
    I request you to please suggest me clearly about  hardware and software changes if required.

    Is that all?

    And - just whom is to define 'clearly?'

    Is your 'remote helper crüe' expected to have full (and retained) knowledge - of  (at minimum) the 'Key/Critical' portions of your 'PAST Hardware AND Software?'     Really?     How possibly then - are 'Suggestions of CHANGE' - to be (properly) generated?

    You request 'Clarity' (via suggest 'clearly')  ...  yet does your posting contain much - which renders your request 'clear?'    

    Might a 'more tightly focused' (i.e. 'somewhat' tightly focused) request - work FAR BETTER - to your advantage?

  • 0 in reply to cb1_mobile
    Intellectual 770 points
    Thank you sir to give me a reply,

    I clearly mentioned ,which techniques are used to control the A.C induction motor. i.e PWM,Space vector pulse width modulation and v/f technique for controlling the speed of A.c induction motor. And we are sensing the two phase currents and applying to the motor inputs.

    So according to that I want to control and operate the BLDC motor.so I am requesting you to, that are sufficient to control and operate the BLDC Motor or any other things required?

    Please suggest me sir.

    Thanks,
    Regards,
    Srinu.
  • 0 in reply to Srinu Vakada
    Guru 117855 points

    Srinu Vakada said:
    I clearly mentioned ,which  techniques are used to control the A.C induction motor

    Exactly as you've noted (see quote, above) what you've (briefly) mentioned are 'General Techniques' - is that not so?

    Yet - you are requesting, 'Necessary Hardware & Software CHANGES' - (and those in GREAT - yet (still) undefined CLARITY) - which prove FAR (very far) from 'General Techniques.'

    Again - as earlier noted - as your  EXISTING 'HARDWARE & SOFTWARE' are 'UNKNOWN  to we helpers' - HOW THEN are,  'Proper, Valid & Efficient CHANGES' (per your request)  to be (reasonably) implemented?

    You have chosen to 'Disregard the earlier suggestion to, 'tightly focus & simplify' - which raises the time/effort - forced upon your helpers!    Can that (ever) prove to your best interest?

    Note that you have received a (very) valid suggestion - if only -  that fact   could be admitted!

    And - Alas - are you Not - quite convincingly (i.e. clearly) seeking  'SPECIFIC ENGINEERING DESIGN ASSISTANCE' - WHICH (ONLY SLIGHTLY) REVOLVES ABOUT/AROUND - VENDOR'S ESTEEMED  MCU?

  • 0 in reply to cb1_mobile
    Intellectual 770 points
    Thank you sir,

    I'm getting the D.c voltage from Dc source and converting into three phase by using pwm and svpwm. After that we converting into 3 phase A.C and applying to motor by sensing two phases and applying to input to the AC induction motor.
    Here we are using V/F technique for controlling the speed the motor.

    So is there any possibility to control the speed of the BLDC motor by using V/F technique or any other techniques required?

    And we are using tm4c123gh6pge microcontroller for program to the application and we are using tiva internal SVPWM.

    Please suggest me anything required to operate and control BLDC motor in place of AC induction motor.



    Thanks,
    Regards,
    Srinu.
  • 0 in reply to Srinu Vakada
    Guru 117855 points

    I have a 'long record' - of truly 'trying to assist' here/elsewhere.

    I can report that - almost 10 years earlier - employing a past LM3S1627 (from the acquired firm LMI) we were (highly) successful in producing & selling BLDC Controllers - which accepted BLDC Motors up to & including 57VDC motor supply.    Subsequent to that success - we migrated to LX4F23x - and then to TM4C123.    (we are NOT fans of '129 - way too slow - and Display Control lacking - imho...)

    Hall sensors provide a very helpful, 'COMMUTATION AS WELL AS SPEED CONTROL'  FOR BLDC MOTORS.      Sensorless systems are more compelling - yet add great complexity - and may (never) match hall sensors - under (very) low speed motor operating conditions.

    BLDC Motors most always are 'Three Phase' and this (and most ALL) ARM Vendors - provide FOUR PWM Generators - which well accommodate 'Trapezoid BLDC Motor Control.'     (if you are (both) clever & resourceful - you may achieve 'Sine-Modulated Control' - which better levels Motor Torque Output - and improves 'Low Speed  Motor Performance.'    

    Note too - those PWM Generators (NOT PWM produced by simple MCU Timers) are capable of 'near automatic'  Cycle by Cycle - CURRENT CONTROL - truly the 'holy-grail' of Motor (and other) Control Systems!     Further - also critical - the 'clever & demanding' (proper) measure of Motor Current - proves the (almost) ONLY means to Control MOTOR TORQUE - which separates, 'Men from Boyz!'

    I could 'go on' endlessly - yet I've a Tech firm to run - and you (still) must 'Tighten your Focus' - and rather than 'Attempt an ENTIRE SOLUTION in ONE GO' (which is characteristic of the (very) young) - I'd suggest that you 'CAREFULLY CONSIDER - THEN IDENTIFY YOUR TOP FIVE BLDC CONTROL DESIGN ISSUES' - and present those here.      

    Then ... as/if time allows (note - staff/I worked this (past) weekend) we ARE JAMMED - I'll respond.    (maybe - again depends upon workload - although most always - I can make some (shortened) response...)

    Should you accept this guidance - and (after good consideration) formulate & present the requested "top five" BLDC Control Design Issues - I will 'try' to provide further detail.     Minus that listing - others are (almost) sure to arrive - to your assist... Farewell...