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
Printed armature motors are the only eletric 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.
- 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 Brushed Pancake Motorsarcing 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 arching 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-coremotors 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
Because the armature of a pancake motor is ironless it also has a low thermal time constant which makes it easy to cool either with air or water
- Excellent EMC characteristics
Printed motors have excellent electromagnetic compatibility characteristics to minimise interference with any nearby electronic components such as communications systems or displays
- Choice of magnets
Printed armature motors are available with standard Ferrite,AlNiCo and NeFeB (Rare Earth) magnet types.Each type offers different performance advantages with regard to speed,torque and temperature stability
- Wide variety of design options
PMW can offer special shafts,dual armature configurations,integrated tachos,encoder mounting adaptors or motors complete with encoders,a variety of armature configurations and diameters,gearboxes,pulleys and solutions for cooling and electromagnetic compatibility
Printed Motor Works offer two distinct brushless pancake DC motor families:the XR Series using an external rotor and the IR Series using an internal rotor. All our compact brushless DC motors can be tailored to meet your exact specification.