ETEL: Ironcore Linear Motors (LMS Series)

ETEL offers the most comprehensive standard linear motors range in the industry. With more than 50 models to choose from, almost any requirement can be successfully fulfilled.

LMA, LMG and LMS motors benefit from ETEL's patented cogging-free design. This construction enables an exceptional peak force density in the magnetic gap, as well as unparalleled thermal efficiency, which is a significant advantage for thermal-drift-sensitive precision machines.

Why choose ETEL:

Direct Drive Advantages:

Reduced Cost of Ownership

Direct coupling of the payload to the motor’s moving part eliminates the need for mechanical transmission elements such as leadscrews, timing belts, rack and pinion, and worm gear drives. Unlike brushed motors, there is no contact between the moving parts in a direct drive system. Therefore there is no mechanical wear resulting in excellent reliability and long lifetime. Fewer mechanical parts minimize maintenance and reduce the system cost. The direct drive technology intrinsic to a linear motor based system results in an efficient and effective gearless assembly

Easy Integration

ETEL linear motors are available in a wide range of sizes and can be easily adapted to most applications. ETEL’s unmatched standard product offering includes ironless and ironcore linear motors. Each technology has specific advantages:

Dynamic Performance

Linear motor applications have a wide range of dynamic performance requirements. Depending on the specifics of a system’s duty cycle, the peak force and maximum speed will drive the selection of a motor:

Wide Force-Speed Range

Direct drive linear motors deliver high force over a wide range of speeds, from a stalled or low speed condition to high velocities. Linear motors can achieve very high velocities (up to 15 m/s) with a trade off in force for ironcore motors, as technology becomes limited by eddy current losses.

Linear motors achieve very smooth velocity regulation, with low ripple. The performance of a linear motor over its velocity range can be seen in the force-speed curve present in the corresponding data sheet.

Principle

Linear motors are a special class of synchronous brushless servo motors. They work like torque motors, but are opened up and rolled out flat. Through the electromagnetic interaction between a coil assembly (primary part) and a permanent magnet assembly (secondary part), the electrical energy is converted to linear mechanical energy with a high level of efficiency. Other common names for the primary component are motor, moving part, slider or glider, while the secondary part is also called magnetic way or magnet track.

Since linear motors are designed to produce high force at low speeds or even when stationary, the sizing is not based on power but purely on force, contrary to traditional drives.

The moving part of a linear motor is directly coupled to the machine load, saving space, simplifying machine design, eliminating backlash, and removing potential failure sources such as ballscrew systems, couplings, belts, or other mechanical transmissions. Finally, the bandwidth and the stiffness of the motion system are much higher, giving better positional repeatability and accuracy over unlimited travel at higher speeds.

Given that frameless linear motors do not include a housing, bearings, or feedback device, the machine builder is free to select these additional components in order to best fit the application requirements.

LMS Ironcore Linear Motors

The LMS linear motors provide substantially higher continuous force than the existing LMG range while being very similar in terms of mechanical integration. LMS is close enough to LMG to allow easy machine upgrade to existing LMG customers looking for higher performance. Applications for LMS can be found in any machines where a high power density is required together with a high dynamic for mid-range moving masses. LMS will successfully fulfill demanding motion requirements from high-end automation machines to demanding semicon/electronic motion systems.

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