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Innovation in Linear Motion

Dual Axis Linear Stepper Motors

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image of Dual Axis Linear Stepper Motors, a type of linear motor
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H2W Technologies Dual Axis Linear Stepper Motors are ideal for open loop positioning applications with light payloads. They can be used at speeds up to 80 in /sec [2m/sec] and strokes up to 40” x 60” [1 m x 1.5 m]. Linear stepper motors are capable of very precise position, velocity and acceleration control when coupled with a microstepping drive and indexer.

The moving assembly called the “forcer” is supported by magnetically preloaded air-bearings imbedded in the active surface of the forcer between the forcer and platen. The bearings are designed to support the customer’s payload and to maintain the required .001” [0.025 mm] gap between the platen and the forcer.

The two axis step and direction signal from a microstepping drive, to the 2 or 4 phase forcer is supplied via a power cable. The motion achieved with a full step is .010” [250 microns] and with a microstep it’s .00004” [1 micron].

The Dual Axis linear stepper motor is a complete positioning stage with the motor, the bearings and the positioning system all built into one compact package.

Integrating a linear encoder with the stepper motor provides a closed loop system.


Advantages:

  • Low profile and small cross section
  • High Speed
  • Low cost positioning stage solution
  • No servo tuning required
  • Multiple forcers on a single platen

Applications:
  • Pick and Place
  • Wire bonders
  • Parts transfer
  • Fiber optic

The Dual Axis Linear Stepper Motor consists of 2 main parts:
  • Moving Forcer Assembly: The forcer is made up of an aluminium housing that contains the motor windings, lamination stacks, and permanent magnets. The active surface of the lamination is slotted to form teeth with a pitch of .040" [1 mm]. The ends of the coil are brought out to either a "D" connector or to flying leads. Mounting holes on the top surface of the forcer are for attaching the customer's payload. The forcer comes in different widths and lengths, depending on the required force. Multiple forcers can be supplied with a single platen to allow for independent moving heads.
  • Platen: The platen is a precision ground steel plate that is slotted to form 0.02” x 0.02” [0.50x 0.50 mm] square teeth on the surface. The spaces between the platen teeth are filled with epoxy to provide a flat air-bearing surface for the forcer. The stroke of the forcer is a function of the length and width of the platen. Platens can be manufactured in different shapes with a multitude of mounting configurations.






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Required Electronics:
The linear stepper motor requires a full step or microstepping driver with power supply that is rated with sufficient current and voltage to meet the motion requirements. With full stepping, the forcer will move .010" [.25 mm] for each step. With microstepping the forcer will divide the fullstep by the number of microsteps. With 256 microsteps / full step, the microstep will be .010" [.25 mm] / 256 = 0.00004" [1 micron]


Environmental Considerations:
The linear stepper motor is a precision device and should not be mounted in an environment that is wet or excessively dirty. Debris should not be allowed to accumulate on the platen.


Mounting:
The platen should be mounted to a flat (better than .003"/ ft [246 microns / m]) and stiff surface. Threaded holes on the bottom of the platen are present for mounting to the customers system. The forcer has threaded holes on the top surface for attaching the payload. The linear stepper motor may be mounted in any orientation. When mounting the platen with the forcer moving vertical, it should be noted that the forcer will be required to generate additional force due to gravity and that the ball bearing forcer will slide down to the bottom when power fails. Turning off the air to an air bearing forcer will lock the forcer in place.

Dual Axis Linear stepper motor