Our frameless 3 phase brushless rotary motors, are direct drive motors that are ideal for both limited rotation and full 360 degree rotation, closed loop servo, positioning applications. They are capable of very precise angular position, velocity and acceleration control when coupled with an encoder for position feedback. The low inertia coil is capable of higher angular accelerations. The unhoused design of this new rotary brushless motor requires a rotary bearing system to guide the coil and to support the customer payload as it moves.
The 3-phase coil assembly can be commutated trapezoidally using integral Hall Effects or sinusodially using software commutation in conjunction with the appropriate amplifier or motion controller and encoder feedback.
The power to the motor (from a brushless servo amplifier) is supplied via a motor power cable.
Larger motors with higher forces are available, consult factory for details and drawings. Custom motors can be designed to fit customer specific application needs.
- Coordinate measuring machines
- Pick and place machines
- Coordinate measuring machines
- Laser and water jet cutters
- Vision inspection equipment
The encapsulated moving coil assembly moves through a gap in the long "U" shaped magnet assembly. A customer supplied bearing system is required to guide the moving coil assembly and to maintain a .025" [0.63 mm] clearance between the magnet and the coil assembly. There is no attractive force between the motor coil and the magnet assembly.
- Unlimited stroke length
- Zero cogging
- High speed and accelerations of light loads
- Low moving mass
- Multiple motors coils inside a single magnet assembly
- Uses standard 3 phase brushless amplifier
Ironless motors are available in 6 different cross sections and 5 different coil assembly lengths. Linear forces range from 1.2 lbs [5.3 N] to 173 lbs [771 N] continuous (100% duty cycle), 3.6 lbs [16.0 N] to 517 lbs [2300 N] peak (10% duty cycle).
Ironless motors consist of a stationary magnet track and a moving coil assembly.
Stationary Magnet Assembly: The "U" shaped magnet assembly is made up of nickel-plated steel back iron and Neodymium permanent magnets. The magnets are bonded to the 2 parallel steel plates and the plates are bolted to a steel spacer bar. Threaded and thru holes are available in the steel back iron for mounting the magnet assembly to the customer supplied base plate. The magnet assembly is available in cross sectional widths from 0.82" to 1.73 " [20.8 mm to 44 mm]. The length of the magnet assembly is a function of the arc.
Moving Coil Assembly: The coil assembly is comprised of a 3 phase copper motor winding, an aluminum mounting bracket and an optional Hall Effect board that are all vacuum encapsulated with epoxy. Mounting holes in the aluminum bracket are provided for attaching the secondary to the moving member of the customer supplied table assembly. The coil assembly is available in many different widths and lengths, to meet the customers force and packaging requirements. Multiple coils can be supplied with a single magnet assembly to allow for independent moving heads or they can be coupled together to produce larger forces.