Model Boat Mayhem

Technical, Techniques, Hints, and Tips => BRUSHLESS Motors and Speed Controllers => Topic started by: Paul R on November 03, 2011, 09:49:30 am

Title: What is a sensored brushless motor?
Post by: Paul R on November 03, 2011, 09:49:30 am

What is the main difference between a sensored brushless motor and a sensorless brushless motor, and do the two have to have a different BESC to power them?

Thanks

Title: Re: What is a sensored brushless motor?
Post by: Subculture on November 03, 2011, 10:04:06 am

http://www.teamnovak.com/tech_info/brushless/sensor_vs_sensorless.html

You can use a sensorless controller on a sensored motor- you just don't hook up the hall sensors. Some sensored controllers will work with sensorsless motors, but they have to be switchable to that mode; some are, some aren't.

For most applications, good sensorless controllers and motors are excellent these days. Only for very fine control would I look towards a sensored set-up. Unfortunately the choice for sensored motors and controllers is much lower than sensorless owing to lower demand.

Title: Re: What is a sensored brushless motor?
Post by: Martin (Admin) on November 03, 2011, 02:01:44 pm

.... and price! Sensored setups are double, tripple the price of a non sensored motor and controller.  

Title: Re: What is a sensored brushless motor?
Post by: Paul R on November 03, 2011, 08:30:26 pm

Ok, Thanks for the replies,

I knew there had to be a difference somewhere, apart from low speed control , it seems that price is the discriminating factor here..
..

Title: Re: What is a sensored brushless motor?
Post by: nick_75au on November 04, 2011, 05:38:02 am

Adding to the Conversation, sensor-less systems are not really necessary for a boat as the motor is essentially attached to a fluid coupling, the motor is not attached to a system where high torque is needed(ie a land vehicle stationary on a steep slope) A low Kv motor will tick over slowly enough to count revolutions.

Nick

Title: Re: What is a sensored brushless motor?
Post by: Subculture on November 04, 2011, 03:44:12 pm

You can convert sensorless motors to sensored operation, however it involves a bit of technical expertise and the use of an oscilloscope. Snesorless controllers are indeed more expensive, however Hobbyking have a good range available, and they're very competitively priced.

Title: Re: What is a sensored brushless motor?
Post by: funtimefrankie on November 04, 2011, 07:04:10 pm

What is a sensored brushless motor?
It will be one with the naughty bits covered? ;D :embarrassed: