I have a need for a motor like this one

its dc 50v

it needs to fit in a smallish space hence its build (like a pancake)

Sorry for got to say its about 7 inches diameter and the alloy bit is about 3.5 inches long

its a fairly powerful motor but i have no specs at all

its fused by a 15 amp so I’m guessing it draws about 8-10 in use so 500 watts or so

Hairy pete

it is off a longford

From the site hairy Pete linked to this is what i need

Unique Features of Brushed Pancake Motors

Brushed pancake motors, or printed motors and Scheibenläufermotoren as they are known in Germany, have a number of unique features that make them stand out from other electric motors:

Size
The motor is much smaller and thinner than normal iron-core motors

Rapid acceleration and deceleration
The armature is very thin giving low-inertia and exceptional torque ratios. The result is extreme acceleration with a typical pancake motor able to accelerate from 0 to 3000 rpm in only 60 degrees of rotation. To achieve rapid acceleration and deceleration printed motors can handle a peak current of up to 10 times the continuous rating which would be impossible for iron-core motors without demagnetising

Zero-cogging
Printed armature motors are the only electric motor variant in the world with no torque ripple. A conventional motor has a tendency to prefer certain positions where the magnetic alignment is best. This is called cogging and creates torque disturbances. The flat armature motor is ironless and is thus intrinsically non-cogging. This gives perfectly smooth rotation at any speed with no ripple effect. Click here for a graph that explains this

Long brush life
Because brushed pancake motors have no iron core there is minimal inductance. The result is no arcing, because there is no stored energy in the armature to be dissipated during commutation. In an iron-core motor a lot of energy is stored in the magnetic field of each coil. When this field collapses, the energy tends to be discharged by arcing to the brushes and this wears them out. Depending on the application, the brushes in our printed motors tend to last as long as the bearings.

Reliable at high speed
Brushed pancake Motors do not suffer from arcing as thus can perform reliably at very high speeds

Instant torque delivery
Another benefit of minimal inductance is that the current flows into the armature extremely quickly (in less than one millisecond). This delivers instant torque

Flat torque curve
The ironless disc motor has a perfectly flat torque curve up to very high speeds whereas iron-core motors tend to fade at high speeds. Thus a small pancake motor may be sufficient where you would have to select a much larger iron-core motor to achieve the same torque at high speed

Easy to cool