Motors: Linear Electric related categories
 | Brushless Cog-FreeLMCF series
The Cog-free brushless linear motor is designed for unlimited stroke (travel) servo applications that require smooth operation without cogging. These motors are supplied in kit form to be integrated into a customer’s machine. They are used in closed-loop servo systems and provide optimum performance.
The linear brushless AC Cog-free servo motor consists of a stationary magnet track and a moving coil assembly. The U-shaped, multi-pole magnet track is comprised of alternating polarity rare-earth magnets bonded to a hardchrome plated, cold-rolled steel plate. Modular track assemblies stack end to end to provide the length of stroke required. The coil assembly must be centered within the U-shaped magnet track and guided by customer supplied bearings. Individual coil assemblies can be mounted in series (as a single unit) to increase force. Multiple coil assemblies having independent operation and overlapping trajectories can also be mounted on a single
magnet track.
The moving primary is a three-phase ironless core coil. The winding is encapsulated in thermally conductive epoxy. The ironless core eliminates the magnetic-attractive force between the coil assembly and the magnet track. A twisted shielded four conductor high flex cable supplies power to the coil assembly. The standard coil assembly is provided with Hall sensors for sinewave commutation alignment, trapezoidal commutation, and crash recovery. Custom designs without Hall sensors are available. An aluminum mounting bracket is integrated with the coil assembly. For improved heat dissipation and increased force, a water cooling option is available on some models.
All specifications are for reference only.
Technical data at 75°C rise over 25°C ambient.
Addition of 10 in x 10 in x 1 in aluminum heat sink increases continuous force by 20%.
Addition of forced air cooling increases continuous force 12%.
Liquid cooling option increases continuous forces by 25% and power dissipation by 50%.
Available on D, E and F series motors only. |
 | Brushless Iron CoreLMIC series
Baldor introduces the newest Linear Iron Core Brushless Servo Motor designed with advanced technologies to minimize cogging, while improving dynamic speed and acceleration capability.
The new LMIC motor series has been uniquely designed, without magnet skewing or slotting, to minimize cogging force thus providing applications with the smoothest possible operation.
Accelerations greater than 98m/s/s (10 g′s), along with higher speeds - to 8 m/sec (320 inches per second) – are now possible. This will improve your machine’s process or positioning time.
Linear motors consist of a stationary magnet track and moving forcer supported by a customer supplied bearing system. This non-contact scheme provides for long trouble free operation.
The quality of the magnetic track design is exhibited in it’s rare earth permanent magnets bonded onto a nickel plated steel plate. Reliability of the forcer is evident by it’s encapsulated laminated steel design –for protection and thermal conductivity properties. Hall sensors provide servo feedback dependability.
The new linear LMIC series is available from Baldor in two configurations, a standard profile and a low profile design - for those applications requiring smaller, tighter packages.
Applications -
Material Handling
Automatic Inspection
Laser Cutters
Bonding/Drilling
High Speed Positioning
Positioning Tables |
 | DC Brushed Linear Servo MotorLMBR series
The brushed linear servo motor is designed for long stroke servo applications. It is ideal for direct linear motion without mechanical linkages in closed-loop position packages.
The moving permanent magnet brush commutated DC linear motor consists of a stationary primary and a moving secondary. The stationary primary is a steel laminated core, with multiple coils inserted into insulated slots. The ends of each coil are connected to a commutator bar that is mounted on an aluminum angle.
The moving secondary features multiple permanent magnets and brushes for commutation. A cable supplies power to the moving secondary. Mounting holes are located on both the primary and secondary.
The magnetic-attractive force between the primary and secondary can be used as a magnetic preload for the bearing system. The customer-supplied bearing system must maintain an air gap of 0.064 cm [0.025 inch] between the primary and secondary. The brush linear motor is available in different cross sections to meet different force requirements. |
 | AC Linear Induction MotorsLMAC series
The Linear Induction Motor (LIM) is designed for highforce, long-stroke applications, such as material handling and people movers.
The single sided Linear Induction Motor consists of a primary coil assembly and a secondary called a reaction plate. The coil assembly is comprised of steel laminations and phase windings with a thermal sensor encapsulated in thermal epoxy. The customer supplied reaction plate is made of 3.2 mm (1/8 inch) thick aluminum or copper plate bonded to a 6.4 mm (1/4 inch) thick cold rolled steel. The aluminum faces the coil assembly. The width of a reaction plate must be equal to the width of the coil assembly. A customer supplied bearing system is used to maintain the 3.2 mm (1/8 inch) airgap between the coil and reaction plate over the length of the stroke.
When AC voltage is applied to the coil windings, a traveling magnetic field is created. This induces current in the reaction plate which in turn creates its own magnetic field. The interaction of the two magnetic fields generates the force and direct linear motion.
Either assembly or the reaction plate can be the moving member of the motor. Typically the reaction plate becomes part of the customer load moving over stationary coil assemblies placed end-to-end for the travel distance. In this configuration the length of the reaction plate must be equal to the center to center distance of two adjacent coil assemblies plus the length of one coil assembly. This will ensure the reaction plate covers adjacent coil assemblies at the point of transition from one coil to the next. Should the coil assembly be the moving element of the motor then the reaction plate length must be equal to the length of stroke plus the length of one coil assembly.
Using two LIMs facing each other can provide increased force. This is known as a double sided linear induction motor. Here the reaction plate will consist only of a 6.4mm (1/4 inch) thick aluminum plate without steel backing. The aluminum will require additional support over the length of the stroke.
A variable frequency inverter will provide velocity control of a linear induction motor. A Linear Induction Motor (LIM) equipped with a linear encoder can do point to point programmable positioning when driven with a vector control and motion controller. These motors are supplied in kit form with customer providing reaction plate (secondary) and bearing system to be integrated into the application. |
 | Non-Commutated DC Linear Motor
Moving Coil and Moving Magnet non-commutated linear motors provide short strokes with constant force over the full stroke in both directions. The motors provide a very fast response because of a low (<1msec) electric time constant.
Non-commutated DC linear motors operate at very high speeds without cogging or force ripple and with infinite resolution. For closed loop operation, the motor is coupled with an appropriate feedback device, motor control and motion controller.
The Moving Coil model consists of a cylindrical coil that moves within an annular air gap of the magnet assembly. The poles are magnetized by rare earth magnets. When DC voltage is applied, the coil is caused to move with constant force. When polarity is reversed, the direction of travel is reversed. Magnetic-attractive forces and hysteresis loss are eliminated. Also, eddy currents can be eliminated by utilizing a plastic bobbin.
The Moving Magnet model is like a piston moving within a cylinder. The piston consists of permanent magnets with steel pole pieces and a shaft that passes axially through its center. Endcaps with bearings on both ends of the cylinder support the shaft. The cylinder contains a bobbin to support the coil and an outside steel tube for containing the magnetic flux. DC voltage applied to the coil causes the assembly to move and when the polarity is reversed the direction of travel is reversed.
- All specifications are for reference only.
- Motors listed above are only a sample of Baldor extensive array of Non-Commutated DC Linear Motors.
- Non-Commutated DC linear motors can be customized to meet any specific requirements.
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 | Linear Piezoelectric Motor
The NanoMOVE single axis or dual-axis stages are driven by unique piezo-friction motors, offering an extremely compact size. Each stage includes a non-contact linear scale encoder, built-in limit switches and an amplifier. The stages can be stacked to create an XY combination.
The NanoMOVE stage is designed for applications where size, weight, speed, accuracy, resolution and repeatability are critical. The compact size particularly suits fiber optic applications ,as well as any other application, where miniaturization and positioning accuracy are essential.
Applications -
fiber-optics
scanning probe microscopy
electronic component alignment
biological sample manipulation
automated manufacturing |
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