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CCS/DRV8305: ESC gets very hot with one motor, but works great with another

Roman Simonyan
Intellectual 440 points
Part Number: DRV8305
Other Parts Discussed in Thread: TMS320F28027,

Tool/software: Code Composer Studio

Hi. It's around 2 months we finished our ESC design and are testing it extensively since. Several days ago we tried it with new motor and ESC got very hot (120C) while rotating the motor with no load.

ESC was designed for 30A continues load and works well and goes max to 90C under full load with this motor - www.rctigermotor.com/.../287.html

When using this motor (www.dollarhobbyz.com/.../losi-1-6-audi-r8-6ix-dynamite-fuze-1200kv-brushless-motor) it ESC heats up to 120C without any load, just spinning the motor (3A current consumption).

I use InstaSpinFOC to rotate the motors. PWM frequency is 45kHz in both cases. I do the ID procedure and change all variables and motor parameters in user.h

Also using: TMS320F28027, DRV8305, 1mOhm FETs, 22.2V LiPos

We tried many different hobby outrunner motors and it works well every time.

What can be wrong here?

  • 0
    TI__Guru** 114905 points
    Hi Roman,

    Do you have a current probe? What is the current in the motor phases?

    The link to the motor is not working. Can you re-send the link or provide the motor specifications?
  • 0 in reply to Rick Duncan
    Intellectual 440 points

    Hi Rick.

    It works well with T-Motor MN5212 or any other hobby motor (340-400KV), but overheats with Dynamite Fuze 1200KV. Try to search on Internet, these sites never work normally.

    Specs I detect with ID procedure:
    MN5212 has Rs 29 mOhm, 9.5 uH, 0.01 Flux

    Fuze has Rs 5 mOhm, 3.18 uH, 0.01 Flux

    I was measuring total current consumption with current probe. MN5212 doesn't heat the ESC even at 25-30 Amps, but Fuze does at 3 Amps.


    Thanks,
    Roman

  • 0 in reply to Roman Simonyan
    TI__Guru** 114905 points
    Hi Roman,

    Total current consumption does not provide a complete picture. It is important to observe the currents in the motor.

    Please examine the motor currents during operation.

    Also, please search for low inductance hobby motor in the forum. There are several posts in the C2000 and InstaSPIN forum. An example is:

    e2e.ti.com/.../920113 inductance hobby motor#920113