German LIEDTKE clutch LIEDTKE model LIEDTKE price

LIEDTKE clutches transmit torque based on electromagnetic principles using magnetic powder. They feature a basically linear relationship between excitation current and transmitted torque, can transmit a certain torque independent of slip, and offer advantages such as fast response, simple structure, no pollution, no noise, no shock or vibration, and energy savings. They are versatile, high-performance automatic control components. Classified by shaft type: double-shaft magnetic powder clutch, hollow shaft magnetic powder clutch, and through-hole shaft magnetic powder clutch. Classified by cooling method: self-cooling, air-cooling, and water-cooling.

LIEDTKE clutch principle

1) Linear relationship between excitation current and torque: Magnetic powder clutches and brakes transmit torque based on electromagnetic principles using magnetic powder. The transmitted torque is basically linearly related to the excitation current. Therefore, changing the excitation current allows easy control of the torque magnitude. Under normal conditions, within the rated torque range of 5% to 100%, the excitation current and transmitted torque are directly proportional. 2) Stable slip torque: When the excitation current remains constant, the transmitted torque is unaffected by the speed difference (slip speed) between the driving and driven components; i.e., static torque equals dynamic torque. This allows stable transmission of constant torque. If applied to tension control, users only need to adjust the excitation current to accurately control and transmit the required torque, thereby simply and effectively controlling web tension. 3) Applications of magnetic powder clutches: Due to the above characteristics, magnetic powder clutches and brakes are widely used in unwind and rewind tension control in industries such as papermaking, printing, plastics, rubber, textiles, dyeing, wire and cable, metallurgy, and other winding processing sectors. Additionally, magnetic powder clutches can be used for soft starting, overload protection, and speed regulation. Magnetic powder brakes are often used for dynamometer loading and braking in transmission machinery. 4) Selection of magnetic powder clutches is generally based on the maximum required transmitted torque, while ensuring that the actual slip power is less than the allowable slip power of the magnetic powder clutch.

LIEDTKE clutch features

1) Magnetic powder clutches and brakes are high-performance automatic control components. 2) High linearity and high-precision torque control. 3) Uses high-temperature resistant coils and superalloy magnetic powder for long service life, smooth engagement, and shock-free operation. 4) CNC precision manufacturing ensures high accuracy, fine machining, good linearity, and superior performance. 5) High-purity magnetic powder without black carbon powder ensures stable performance and long life. 6) Aluminum alloy construction provides excellent heat dissipation, good demagnetization, and fast response. 7) Smooth operation with no vibration, shock, or noise during start-up, running, and braking. 8) Torque is proportional to excitation current within the specified torque range, allowing use as a linear adjustment component. 9) Constant output torque, as torque magnitude depends solely on excitation current and is independent of slip speed. 10) Frequent engagement/disengagement with fast response and high frequency, reaching up to 40-60 times per minute, suitable for rapid operation and high-frequency applications. 11) High power amplification factor allows control of large transmitted power with small excitation current, facilitating automatic control. 12) Smooth operation with no vibration, shock, or noise during start-up, running, and braking. 13) Overload protection: Automatic slip operation under torque overload conditions provides overload protection. 14) Compact size and light weight for easy installation and long service life.

LIEDTKE clutch selection

1) Operating torque range: The maximum torque of a magnetic powder clutch during operation depends on coil temperature rise, magnetic saturation characteristics, powder life, and mechanical strength. It can be selected as 130% of the theoretical torque. The lower torque limit is determined by idle torque and torque stability, typically above 50% of the theoretical torque. 2) Structural type: Rotating coil magnetic powder clutches with slip rings have good heat dissipation but are prone to failure during operation, resulting in poor reliability. Additionally, this structure requires frequent reversal during operation, which adversely affects bearing life and is unsuitable for high-speed transmission systems. Stationary coil magnetic powder clutches without slip rings are reliable, have low idle torque, and fast torque rise after energization, but slightly increase excitation power, volume, and weight. 3) Working surface shape: Cylindrical rotor structures are large with uneven magnetic powder distribution but stable performance, suitable for large machinery. Drum-shaped rotors have smaller moment of inertia and dimensions, suitable for mechanical transmissions requiring high sensitivity. Disc-shaped rotors have low moment of inertia and rapid action, suitable for high-frequency engagement applications.

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