Brushless Linear Motors
The 3 phase brushless linear motors, also known as a linear servo motors, are direct drive motors that are ideal for long stroke, closed loop servo, linear motion applications. They can be used at speeds up to 240 in / sec [6 m / sec]. They are capable of very precise position, velocity and acceleration control when coupled with a linear encoder for position feedback.
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.
Brushless Linear Motors
Applications:
Pick and Place Machines
Coordinate measuring machines
Laser and Water jet cutters
Vision Inspection Equipment
Ironless Motor
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.
Advantages:
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. 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 widths from 0.82″ to 1.73 ” [20.8 mm to 44 mm]. The length of the magnet assembly is a function of the stroke. Single piece magnet assemblies are available as long as 40” [1036 mm] for all motors. Longer strokes will be supplied in modular sections.
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.
Iron Core Motor
The encapsulated moving coil assembly moves over the flat 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 an attractive force between the motor coil and the magnet assembly.
Advantages:
Unlimited stroke length
Magnetic-attractive force between coil assembly and magnet track used as preload for bearing system
Coil features reduce cogging
High speed and accelerations of heavy loads
Multiple motors coils on a single magnet assembly
Uses standard 3 phase brushless amplifier
Iron core motors are available in 7 different cross sections and 7 different coil assembly lengths. Forces range from 18 lbs [80 N] to 1164 lbs [5179 N] continuous (100% duty cycle), 48 lbs [213 N] to 3105 lbs [13813 N] peak (10% duty cycle).
Iron core motors consist of a stationary magnet track and a moving coil assembly.
Stationary Magnet Assembly: The flat magnet assembly is made up of nickel-plated steel back iron and Neodymium permanent magnets. The magnets are bonded to the one side of a steel plate. 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 widths from 2.5″ to 10.5 ” [63.5 mm to 267 mm]. The length of the magnet assembly is a function of the stroke. Single piece magnet assemblies are available as long as 39.8” [1010.9 mm] for all motors. Longer strokes will be supplied in modular sections.
Moving Coil Assembly: The coil assembly is comprised of a 3 phase copper motor winding around a steel lamination and an optional Hall Effect board that are all vacuum encapsulated with epoxy. Mounting holes in the steel lamination 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.
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