Feedback
Let us know what we can do better.
X

(888) 702-0540
(661) 291-1620
Innovation in Linear Motion

Brushless Linear Motors

Overview
Products
Technical Data
Operating Info
Videos
image of Brushless Linear Motors, a type of linear motor
Request A Quote

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.

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. Single piece motors are available as long as 5.3” [134.6 mm] for series BLDM-A & BLDM-B motors, 10.1” [256.5 mm] for series BLDM-C motors, 14.9” [378 mm] for series BLDM-D motors, 17.3” [439 mm] for series BLDM-E motors, and 20.0” [508 mm] for series BLDM-F motors. 

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. Single piece motors are available as long as 6.4” [162.6 mm] for BLSM-1 series motors, 11.8” [299.7 mm] for BLSM-2 series motors, 17.2” [436.9 mm] for BLSM-3 series motors, 22.6” [574mm] for BLSM-4 series motors, 28” [711.2 mm] for BLSM-5 series motors, 33.4” [848.4 mm] for BLSM-6 series motors, and 38.8” [985.2 mm] for BLSM-7 series motors.

    Brushless Motor Product number Chart



    Brushless Motor Product number Chart

    Loading...
    Click to enlarge images. BLDM product info drawing

    BLST product info drawing

    Required Electronics:
    The motor requires either a trapezoidal or sinusoidal 3 phase brushless amplifier with power supply that is rated with sufficient current and voltage to meet the motion requirements. The inductance of the linear motor coil should be greater than the minimum load inductance of the servo amplifier.


    Environmental Considerations:
    The brushless motor is an open type motor and should not be mounted in an environment that is wet or excessively dirty. It should be protected with some type of bellows or cover when installed by the customer.


    Mounting:
    The brushless linear motor should be mounted to flat (better than .003"/ ft [246 microns / m] and stiff surface. Threaded and thru holes in the magnet assembly and threaded holes in the coil assembly are present for the mounting of the motor to the customers system. A cable carrier must be provided by the customer to route the motor and Hall Effect cable. The motor may be mounted in any orientation.


    Maintenance:
    The ball bearing guides in the stage should be periodically lubricated with the manufacturers recommended grease. The open glass encoder scale should be wiped with a glass cleaner occasionally to ensure trouble free operation.


    Coming Soon