Re: searching brushless motor with sensors, 12V, 500-700Watt
- From: Tim Wescott <tim@xxxxxxxxxxxxxxxx>
- Date: Sat, 03 Mar 2007 09:09:43 -0800
Jamie wrote:
Wolfgang wrote:
Hello,
I search for an application with very high torque request at zero
speed
a brushless motor with sensors. Parameters: 12V, 500-700Watt
Who can tell a manufacturer of such a motor?
Best regards
Wolfgang
--
www.ibweinmann.de
brushless motor control
Look at stepper motors., they have a high torque rate of
holding how ever, they work in degree's/ indexes per turn. the more you
get the more expensive and at 700 Watts, that sounds very expensive.
On the second note how ever, they require no feed back.
On the third note:
- they're far bulkier for the torque than a brushless
- they consume far more power for the torque than a brushless
- if the load should exceed the torque capability of the motor the motor's average torque will go to zero, leading to a failure mode that is, at best, unrecoverable until things stop.
Stepper motors are good for simple applications when you can afford to significantly over specify. Other than that they're way more trouble than they're worth.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Posting from Google? See http://cfaj.freeshell.org/google/
"Applied Control Theory for Embedded Systems" came out in April.
See details at http://www.wescottdesign.com/actfes/actfes.html
.
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