[PSUBS-MAILIST] pump motor

[Alan James via Personal_Submersibles]

Glen,I am just about to get back in to a project using anRC BLDC motor as a thruster. Have a 3 hp one witha lot of starting torque that spins a Yamaha 4 hp propwithout gearing. With regard to your pump; you will either need a suitableelectronic speed controller with reverse, or you could build an H bridgecircuit on the appopriate 2 of the 3 wires from the speed controllerto the BLDC motor.  There are normally 3 wires from the controller to
the motor, the central one is for position feedback & the other two can be switched around happily for reversing the polarity.You will need some sort of delay so you are not wacking it in to reversewhile it's still rotating.Ken is an expert on this.Hank had some great low priced DC pumps that he posted links to a while back.Alan
      From: glen brown via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Saturday, July 25, 2015 2:55 AM
 Subject: Re: [PSUBS-MAILIST] pump motor
   
HankI think using a set in either direction could work, the motor is not that long . Another option could be be rotating 180 deg.With all the issues that the trolling motors have I think its something I'm going to have to look into  plus our dollar exchange rate is at 13 to 1 at present.I wonder what size and pitch prop one would use?Glen



On Fri, Jul 24, 2015 at 4:33 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Glen,
I looked at it real hard, the motors are well compensated with a rubber bladder at the bottom.  They are also sleek and made from SS.  The problem is, they are not reversible, as far as I could figure.  Maybe someone knows a way to reverse them.   If you can find a way to reverse them, please let me know.  I would use them in a flash!
Hank
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