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H2W Technologies, Inc 28310C Ave Crocker Valencia, CA 91355 USA
(888)-702-0540 (661)-702-9346 Ph (661)-702-9348 Fax
www.h2wtech.com info@h2wtech.com
DC Linear Brush Motor
Travel 120 inches [3 m]
Velocity 100 inches / sec [2.5 m/s]
Acceleration 12 G's 12 G's
Peak Force 180 lbs [800 N]
Continuous Force 60 lbs [266 N]
The DC brush linear motor is ideal for long stroke, open or closed loop
servo, linear motion applications. They can be used at speeds up to
100 in / sec [2.5 m / sec] and as low as 1 in/sec [25 mm / sec]. They are
capable of very precise position, velocity and acceleration control when
coupled with a linear encoder.
The motor is commutated using brushes on the moving permanent magnet
secondary in conjunction with a stationary commut ator bar on the coil
assembly. This results in only the coils directly beneath the secondary
with current flowing in them.
The short moving brush assembly is magnetically attracted to the long
stationary laminated coil assembly. A customer supplied bearing system is
required to
guide the moving secondary and to maintain a .025” [0.63 mm]
gap between the secondary and the coil assembly.
The power to the motor (from a customer supplied PWM DC servo
amplifier) is supplied to the moving secondary via a power cable. The
resultant force is proportional to the input current.
The low overall height (1.65” [41.9 mm]) of the brush motor allows it to
fit into a very compact space The low moving mass of the secondary
allows for higher accelerations of light payloads.
The motor comes in different widths and secondary lengths to meet
different force and packaging requirements.
Advantages:
· Low profile and small cross section
· Available in many different widths and lengths
· High Acceleration of light loads
· High Speed
· Uses low cost PWM amplifier
Applications:
· Pick and Place
· Coordinate measuring machines
· Parts transfer
· Inspection Machines
The Linear Brush Motor consists of 2 main parts
· Long Stationary Coil Assembly: The laminated motor stacks are insulated and bonded together. The copper coils are inserted into insulated slots in the
stack. The ends of the coils are brought out and soldered to the commutator bar. An aluminum mounting angle and a mounting bar are bolted to each side
of the lamination st ack. Threaded mounting holes in the angle or “T” nuts are available to mount the coil assembly to the customer supplied base plate.
The coil assembly is available in widths from 2.0” to 5.0 “ [50 mm to 125 mm]. The length of the coil assembly is a funct ion of the stroke. Single piece
motors are available as long as 144 inches [3.6 m]. Longer motors will be made in sections.
· Short Moving Secondary Assembly: The secondary is made of nickel plated steel with permanent magnets bonded to bottom. A PCB with brushholders
and brushes soldered on, is mechanically attached to the side of the secondary. Mounting holes are provided for attaching the secondary to the moving
member of the customer supplied table assembly. The secondary comes in different widths and lengths, depending on the required force. Multiple
secondaries can be supplied with a single coil assembly to allow for independent moving heads or they can be coupled together to produce larger forces.
The standard lengths for the secondaries are 4.38” for BRA motors and 9.56” for BRB motors.
Required Electronics:
The motor requires a single phase brush type PWM 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 brush 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 DC brush motor should be mounted to flat (better than .003”/ ft [246 microns / m] and stiff surface. Threaded holes on the bottom of the coil assembly or
optional thru holes are present in the aluminum angles to allow for the mounting of the motor to the customers system. The moving secondary assembly has
threaded holes on the top surface for attaching it to the customer supplied moving table. The motor may be mounted in any orientation. When mounting the
