methods said:
That does not make any sense to me. Halls should be totally isolated from phase voltage..... (unless they are mechanically shorted

)
If they are blowing due to induced noise then that can be handled with some inline resistance and a bypass cap like you see on the 9C boards. I would love to see the original information regarding this voltage issue. I have certainly seen a lot of hall failures with Crystalyte motors (and not a single one with 9C motors...) but most of the failures were mechanical in nature... i.e. the wire desoldering from the hall leg.
-methods
On Tue, Aug 16, 2011 at 3:31 PM, Crystalyte <crystalyte@yahoo.cn> wrote:
> Hi Wojtek,
> I have found the problem why the HT and HS sensor not reliable. We are using
> the HONEYWELL 41F sensor. It is just available for 48V system.
> If any client take the motor with 72V then the hall effect sensor will be
> cook.
>
> HONEYWELL SS40 sensors :
> We do check the SS40 may not good for bicycle motor.
> - The ss40 design for small slow speed motor.
> - Also it is design for lower voltage system. The 72V or more voltage system
> will brunt the sensor as well.
> Please check on your side as well.
>
> HONEYWELL 43F sensors :
> HONEYWELL suggest we take the 43F sensor for 72V or higher voltage motor
> system in biicycle.
> What do you thik?
>
> It is the reason for me asking about what about the motor for what voltage
> in last mail.
> By the way, for the high voltage motor which most take for 72V or more. We
> will make the 5400 motor with deep slot on the silicon sheet. So it must
> reliable.
> Feel free mail me for more information.