TPA-UH Model Linear Motor Type with Ironless Core

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Product Detail
UH3
UH4
UH5

Technical Term

Selection Guide

Direct Drive Motor Options

Wiring Instructions Of Sensor

Maintenance And Lifespan

Technical Term

Selection Guide

Direct Drive Motor Options

Wiring Instructions Of Sensor

Maintenance And Lifespan

FORCER & STATOR Series Electromagnetic force driven

■ Inner Structure

TPA-UH Model Linear Motor Type with Ironless Core

■ Product Principle

The synchronous AC current passes through the three coils in the forcer, reversing the current direction to generate a changing magnetic field. This magnetic field interacts with the stator to produce attractive and repulsive forces, creating continuous thrust that keeps the mover in motion.

■ Product Advantages

1. Zero Cogging Effect

The forcer adopts a fully resin- or epoxy-encapsulated construction without laminated silicon steel cores. This ironless configuration eliminates the periodic variation in magnetic reluctance between the permanent magnets and iron teeth, removing the physical source of cogging force. The absence of an iron core also results in extremely low inductance and several-fold faster current response, providing ample control bandwidth for high-frequency micro-motion and vibration compensation.

2. Ultra-High Repeatability

With a nanometer-scale linear scale or laser interferometer used for position feedback, the extremely low mechanical time constant of the ironless forcer allows higher control-loop gains without eddy-current losses. The resulting increase in system stiffness helps minimize steady-state positioning error. This level of precision supports demanding applications such as kerf alignment in 12-inch wafer dicing and hole-array positioning in femtosecond laser drilling, helping improve overall process yield.

3. Extremely Low Attraction Force

The ironless design generates virtually no magnetic attraction to the mounting base, simplifying the mechanical structure while reducing the tendency to attract ferromagnetic contaminants. Iron filings, tool debris, and wafer fragments are less likely to accumulate around the motion system, significantly reducing the risk of guideway scratching or jamming caused by foreign particles. This makes the motor particularly well suited to Class 1 and Class 10 cleanroom environments. The guideway and slide are subjected primarily to inertial loads, resulting in a more uniform loading condition and helping maintain positioning accuracy over extended operation compared with iron-core designs.

4. Excellent Performance at Ultra-Low Constant Speeds

The ironless construction performs exceptionally well during constant-speed motion at ultra-low velocities down to the micrometer-per-second range, without the stick-slip behavior commonly associated with conventional iron-core motors. The combination of cogging force and friction in iron-core designs can cause repeated transitions between static and dynamic friction, leading to unstable low-speed motion. With very low thrust ripple, typically below 1%, together with a high-frequency disturbance observer (DOB) and friction feedforward compensation, the driving force can be maintained above the threshold required for smooth movement within the linear friction regime.

TPA-UH Model Linear Motor Type with Ironless Core

The stator and forcer are the basic components of a linear motor. The stator is typically composed of permanent magnets that generate a magnetic field, while the forcer contains electromagnetic coils and moves linearly along the stator. When current flows through the mover coils, an electromagnetic field is generated, interacting with the stator’s magnetic field to produce force, driving the mover in linear motion. The TPA-UH features a coreless mover and U-shaped stator, providing a direct replacement solution for compatible linear motor systems. By eliminating the iron core, the coreless mover and U-shaped stator design effectively remove cogging effects and fluctuations in magnetic attraction commonly associated with conventional iron-core motors. This enables exceptionally low speed variation and high positioning accuracy. The lightweight mover delivers fast dynamic response, while the high-strength U-shaped stator provides a robust structural platform. In addition to optimizing electromagnetic performance, this configuration offers excellent mechanical compatibility and can directly replace existing linear motor modules of matching specifications, significantly reducing the technical complexity and time required for equipment upgrades and retrofits. The TPA-UH is widely used in applications requiring precise linear motion and scanning performance, including laser processing equipment, semiconductor manufacturing equipment, precision CNC machinery, electronic production equipment, medical equipment, and 3D printing systems.