Looks like it is a 24vdc golf cart motor so it is like a universal motor some call "series wound" especially since you had to remove brushes and add magnets so everything I said about universal motors apply. By removing the commutator action with it's windings in series with the outside windings you have eliminated the timing for which the motor coils fire. Therefore you will need a circuit that fires pulses based on a sensor you will need to place on the shaft.
Did you see my earlier post of Peter Lindemann's simple / effective circuit for a universal motor? His little circuit does the pulsing using a magnetic reed switch plus recovers all of the collapsing field energy back to an extra battery. You could use a hall effects switch also.
Here it is and how when taking out the rotor you hook the 2 outside windings

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