brushless sensorless controllers

Alex,

Could you send me the part number of the motor so I can look up the datasheet?

LT

its a custom motor

we prefer to make with out hall sensors- motor possition does not matter, as long as it goes forward

Alex,

The DRV8332 will drive a 24volt motor up to 13A's. The switching frequency is 500KHz and as for running a 150,000 rpm motor this will be fine. We are currently developing a DRV8832 EVM, I can try to give you an estimate on the release date next week.

LT

Hello , our motor is 24 volts , - up to 7 amps , the spec sheet says les than 24 volts  ? do you have controller that can handle this ?

sorry did not read carsfully ,  it will handle 24 v- how about sensorless - we only have 3 wires comming out of motor ?

DRV8312DDW we orded an eval board. Do you know on outside engineer who can help us with this project . we profer someone who has exsperience with this controller.

can the eval board controller the rpm of the motor or do we have to buy additional switches or  turn swithes or pots.

we want to add a feature we want to add a pressure transducer - so when air gives signal to transducer it converts to electric signal and controls the speed on the motor

Alex,

The evaluation board controls the RPM of the motor up to 3000RPM soley through a windows GUI (no pots), this limitation is because the motor that comes with the kit is only spec to go this fast, the GUI can be changed to go 150,000RPM very easily. The C2000 code that is on the microcontroller side would also need to be modified to meet your motor parameters instead of what is on there for the motor that comes with the kit. There is extra ADC pins on the C2000 microcontroller (but there is not an easy way to access them with the Evaluation kit), also there is a SPI header on the Evaluation board that will allow you to attach a external device fairly easily, such as a sensor/transducer.

I will check into an outside engineer for you.

LT

I forgot to mention the Kit comes with the code to run sensored or sensorless control.

LT

Hey Alex,

I did some research into this and D3 ( www.d3engineering.com/ ) Is a really good outside engineering firm that can give you a qoute and help you out, we use them also.

LT

With the DRV8312-C2-KIT

It doesn't provide enough current, but for initial evaluation I don't think your motor will draw that, I'm sure that's under some sort of load, correct?

There is a GUI available for a new technique called InstaSPIN-BLDC

We have used this with high speed medical motor similar to yours.  It is very robust for a small motor sensorless application like this as it works based off of a flux measurement.  You will be able to spin your motor at 150k rpm, assuming it isn't pulling more than the 3.5A of DRV8312.

D3 is very familiar with the software, DRV83x, and these types of applications.