Motor Part number

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Model: PR775AG-7021

Motors information:

  • 750W (both motors together 1 horse power)
  • high-torque
  • custom twin motors
  • weight: 12oz each

Chopper side (with wheel)

Model: PR775AG-7021-97FR-B
0.03 Volts: 18.0V/DC
EXT: 25.0~25.1
(green label, stamped CW , C)

Other side

Model: PR775AG-7021-90FR-B
0.03 Volts: 18.0V/DC
EXT:24.9~25.0
(white label, stamped CCW , D)

Description

Apparently sold by http://www.promotor-sz.com/

Here's the spec, although it looks like Roth Motors had them custom made with an extra long shaft and motor cone (perhaps added afterwards).

http://www.promotor-sz.com/EnProductShow.asp?ID=694
http://www.promotor-sz.com/pdf/PR770&775.pdf

Both motors appear to be wound exactly the same. Looking from the back, with the word PRO stamped in the metal on the right, both motors will spin clockwise if + is attached to connector above PRO and - to the connector below PRO.

The Chopper Side motor (the one with the wheel has a red dot below and to the left of the word PRO. The connector closest to the dot must be connected to POS, or RED cable from the Motor Controller.

The other motor has a red dot above the word PRO. The connector closest to the dot must be connected to POS, or RED cable from the Motor Controller.

Connecting incorrectly will cause the motors to fight each other by spinning the wrong direction and will probably damage the Motor Controller.