DRV2603 BLDC motor driving

Hi Javier,

thanks a lot for getting back to me, I was tonight going to send Gerber's with MOSFET driver for this motor but now it seems you can clear things.

I do not have a evm but I have the drv directly soldered to the wires and have epoxy coating to have wires not break and have it inbuilt soldered with ERM/ LRA pin connected to GnF meaning I have it in ERM mode, now I tried:

a) pulling high EN pin logic level high 3volts, then,

b) driving the PWM pin on drv with GPIO either full on or off, not pwm but that isn't working, it should drive this motor but instead I have to do something as following:

digitalWrite(pwmPin, HIGH);

delay(70);

digitalWrite(pwmPin, LOW);

delay(5);

∆ the above drives the ERMs that too occasionally and at times with jitters but did never drive this particular motor have.

Nishant,

Just to clarify, does your ERM work when you use the listed code?

If you can provide the portion of the schematic that contains our device, so that I can verify all of the connections?

Best Regards,

Javier Palomo

tested with ERMs , all work as documented very good. leaving the coin motor I have!

Nishant,

That is interesting, I am looking at the link you provided for the motor and I did not see anything about an Inbuilt Driver. Is there a way to bypass the driver and connect it straight to the leads of the motor?

As for the LRA you can adjust the rated voltage based off of the duty cycle of the PWM input. So if you are sending 3.0VDC to VDD, and you want to drive the LRA at 1.8VDC then you will use a 60% duty cycle on your PWM (calculated using the below equation, where Vout(full-scale) = VDD).

The DRV2603 needs a minimum of 2.5V to power on the device, so make sure you are supplying VDD at least 2.5V.

Best Regards,

Javier Palomo

Hello Nishant,

Sorry I am not sure if I understand your last message "tested with ERMs , all work as documented very good. leaving the coin motor I have!". 

Is everything working okay now?

Best Regards,

Javier Palomo

Javier Palomo said:

Is there a way to bypass the driver and connect it straight to the leads of the motor?

Not really cannot bypass the driver, here's it blown out: 

and then its Brushless then I have to do a lot to handle 3 phases etc stuff with extra device not really a worthit. 

The LRA stuff looks promising, seems like I can go ahead and put DRV2603 on my PCB :).  (did you get anychance to have a look at the datasheet of the chosen LRA?)

with "ERMs working I mean't"  

The cylindrical ERMs are working as documented and not the coin motor!

Nishant,

Very good, thank you for showing the image, and I am glad that the ERM's are working!

As for the LRA, I did notice that the resonant frequency is at 235Hz, and unfortunately the DRV2603 only has auto-resonance tracking from 140Hz to 220Hz.

The DRV2604/5 auto resonance tracking has a range from 125Hz to 300Hz, and the DRV2624/5 have a range from 45Hz to 300Hz. Either of these solutions will work with your LRA if you intend to use auto resonance tracking.

Best Regards,

Javier Palomo

can you suggest an LRA that is 8mm dia and 3mm thick? and can work with drv2603 you see the options you showed are BGA and I don't want BGA

Nishant,

Off the top of my head I cannot think of one for that size and resonant frequency, but I would recommend looking at some of the vendors shown in the links below:

Jahwa: http://www.jahwa.co.kr/eng/common/product/product01_view.php?idx=46&bm_id=2

Nidec: http://www.nidec-copal-usa.com/

AAC: http://www.aactechnologies.com/category/45

Precision Microdrives: https://www.precisionmicrodrives.com/product-catalogue/linear-resonant-actuator

KOTL: http://www.vibration-motor.com/products/lra-linear-resonant-actuator-vibration-motors.html

NFP: http://www.nfpmotor.com/Products-linear-resonant-actuators-lras.html

These are just some of the vendors I found using google, so I am sure there are many more. I did notice that the resonant frequency is 235Hz for most of the <9mmx3mm LRA's. I would double check, but you will find more solutions with the desired resonant frequency if you look for a larger LRA size.

Best Regards,

Javier Palomo

Javier,

Thanks for the heads up, in the afternoon I submitted the gerbers for manufacturing but have to recall them back! ,A major setbach :(.

any ways thanks for the links, Im checking them one by one.

ONE crucial question though, can I Drive DRV2604L with only PWM connected? you see as I cant access the middle BALL pin of SDA without HDI PCB development which is very costly!