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Driver to control a 110V/220V 600W AC Motor Speed

Other Parts Discussed in Thread: UCC27712

Hi, 
I have to control the speed of an AC motor and I need some reference design and guidelines to design my own speed controller for an AC motor. Right now, I have a 110V AC motor but it would be better if I can design a universal driver for 100V to 240AC Motors. Any help or suggestion is highly appreciated. 
I attached a link to the AC motor that I have right now. Thanks

https://ml-motor.en.made-in-china.com/product/WKcnkZFocdVB/China-China-Manufactury-Strong-Suction-Small-Motor-Home-Used-for-Vacuum-Cleaner-ML-H3-.html

  • Hello Ali,

    We don't have any BLDC-branded products today which can operate above 100V, however I am looping in the high power drivers team (1/2-H gate drivers)

    Thanks,

    Matt

  • Hi
    Thanks for the reply. I don't know why you mentioned about BLDC branded product. Although, I am using an AC motor. Thanks

  • Sorry Ali, the forum owners directed this to my group (BLDC), so I needed to redirect it.

    Thanks,

    Matt

  • Hello Ali,

    Most reference designs I see for motor control are with the BLDC but I did find one that may be of use.

    See the link below.

    https://www.ti.com/tool/TIDM-1AXISMTR-PFC-5X

    I am in the high power driver group which has products that can address your controller to power train gate drive solutions. We have products suitable for high voltage gate drive solutions such as the UCC27712 620V half bridge gate driver.

    If you have a block diagram or simplified schematic later we can help with the gate driver product solutions.

    Regards,

  • Hi 

    This is the block diagram if you are looking for it. I don't need a very complex circuit. I have to run the AC motor at two speeds i.e 100% and 60%. Usually, it will run at max speed except at the very start mode. Is UCC27712 can drive an AC motor to control speed?
    Thanks

  • Hello Ali,

    Thank you for the basic block diagram. I don't know if you had a chance to look at the one reference design or if there was any useful information. It looks like there is 100-200VAC coming as the input, I assume at some fixed frequency. Is this 50-60Hz line frequency, and you want to control the line and neutral conduction time to the motor, is that correct?

    I am not an AC motor drive expert, but I would think these type circuits might use triacs or SCR's maybe to control the conduction time of the AC voltage. I would suggest some general research on this drive method if that is intended in this application.

    Regards,

  • Hi
    Actually, the purpose of the block diagram to provide you a rough sketch. I am new to control the AC motor. The motor that I want to control is Universal AC Motor. I searched about various ways to reduce voltages to control speed but I want to use the more standard methods like some driver chips to control it.
    If there is no driver chip or circuit available then I will go for SCR based or Triac-based solution.
    Thanks

  • Hello Ali,

    From TI standpoint we have a number of BLDC drive solution IC's and supporting collateral. For the AC drive I only found the reference design which I indicated. I would research the web further to see what methods are used for AC motor drive. If you find a good architecture, we do have IC's that can support many functions including MOSFET and IGBT drive if required.

    Regards,

  • Hi
    Did you find any solution on the web about AC motor Drive?
    Thanks

  • Hello Ali,

    I think to control an AC motor a variable frequency drive is used. In this case you need to rectify and filter the line AC voltage to generate a DC link voltage. Then for each phase you use a half bridge power train to generate the drive voltage to the motor with the controller determining the frequency to the half bridge power stage. The control aspect and method is the part I cannot assist.

    There is a general explanation in the link below.

    http://www.vfds.org/understanding-vfd-circuit-370326.html

    Regards,