DRV8301: Can senseless startup without MOTOR IDENTIFICATION ?

Tiger Chen

Part Number: DRV8301

Hi,

Can I design BLDC speed controller without HALL sensor and customer might not know the motor parameter such as Ls_d, Ls_H, Rs, Pole Pair number etc ?

If not, can end users or customer enter these parameter via e.g. mobile phone setting on-the-fly ?

Tiger

over 7 years ago

0 Ramesh Ramamoorthy over 7 years ago

TI__Mastermind 27240 points

You can design BLDC controller without HALL sensor and need not know its parameters. Control range may be restricted. While it is possible to enter data using cell phone, we dont have any example to support that.

0 Tiger Chen over 7 years ago in reply to Ramesh Ramamoorthy

Intellectual 750 points

Thanks for your quick reply.

I have one more question regarding sensor-less full load start for eBike that customers might not know the parameter of their motor parameter even pole number, can InstaSPIN still handle it ?

if not, can you tell me at least which information they need to know and can those parameter can be setup on-the-fly (e.g. variable store on flash ?)

Thanks

0 Yanming Luo over 7 years ago in reply to Tiger Chen

TI__Guru** 115420 points

1. It's very tough to start the motor with full load stably using sensorless instaSPIN-FOC, especially for eBike applications regardless of you known the motor parameters. Sensored-FOC is more appropriate in most eBike applications.

2. You may refer to below two application notes to understand how to use flash API to save the parameters in flash.
www.ti.com/.../sprabv4b.pdf
www.ti.com/.../sprab69.pdf

0 Tiger Chen over 7 years ago in reply to Yanming Luo

Intellectual 750 points

Hi Yanming,

How about with known motor parameter a EBike can able do Sensorless FOC startup ?

0 Yanming Luo over 7 years ago in reply to Tiger Chen

TI__Guru** 115420 points

Yes, the motor can be run with the known parameters. It's not a key factor for E-Bike, sensorless-FOC is very difficult to start from zero speed with very heavy load that is just a necessary condition for E-bike, that's why all existing E-bike need hall sensor.

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DRV8301: Can senseless startup without MOTOR IDENTIFICATION ?