German Harmonic clutch Harmonic model Harmonic price

Harmonic clutch refers to a friction clutch in which the clamping force is generated by electromagnetic force. Because it enables remote operation, requires low control energy, facilitates machine tool automation, features fast response and simple structure, it has also gained wide application.

Harmonic clutch classification

Electromagnetic clutches are available in two types: fixed-coil and rotating-coil. In the former, the electromagnetic coil is fixed to the compressor housing and does not rotate; in the latter, the electromagnetic coil is connected to the pulley and rotates. 1) Fixed-coil clutch: The electromagnetic coil is mounted on the compressor end cover and does not rotate; the rotor is held above the electromagnetic coil by bearings and retaining rings, and the outer part of the rotor serves as the pulley. The armature (clutch plate) is installed at the end of the compressor crankshaft. A fixed-coil electromagnetic clutch mainly consists of a pulley, electromagnetic coil, pressure plate, and hub assembly. One terminal of the electromagnetic coil is grounded, and the other is connected to the power supply via an air conditioning relay. When the air conditioning switch is turned on, the air conditioning relay energizes, supplying current to the compressor's electromagnetic coil, generating a strong magnetic field that engages the driven plate of the compressor's electromagnetic clutch with the freely rotating pulley, thereby driving the compressor main shaft to rotate and enabling the refrigeration system to operate. When the air conditioning relay is de-energized, the current to the electromagnetic clutch coil is interrupted, the magnetic field disappears, and a spring separates the driven plate from the pulley, stopping the compressor. 2) Rotating-coil clutch: Its operating principle is the same as that of the fixed-coil clutch, but the position of the electromagnetic coil differs. In the rotating-coil design, the electromagnetic coil is part of the rotor and rotates with it; current flows to the electromagnetic coil through brushes mounted on the compressor, establishing a magnetic field. The magnetic field brings the armature into contact with the rotor, and the rotation of the entire electromagnetic clutch assembly, consisting of the armature, rotor, and coil, drives the compressor. Both types of electromagnetic clutches have several flux grooves machined into the armature and rotor to concentrate the magnetic field and increase the attraction between them.

Harmonic clutch features

1) High-speed response: As it is a dry type, torque transmission is rapid, enabling convenient operation. 2) High durability: Good heat dissipation and the use of high-grade materials ensure excellent durability even under high-frequency, high-energy operation. 3) Easy assembly and maintenance: The magnetic coil is stationary and housed within ball bearings, so neither core removal nor carbon brushes are required, making it simple to use. 4) Reliable operation: Plate springs are used, preventing loosening even under strong vibration and ensuring good durability.

Harmonic clutch usage methods

1) Engagement and disengagement: When installed between the drive side and the starting side, engagement and disengagement can be performed as needed without stopping the drive side. 2) Speed change: When speed changes are required during operation, using the clutch allows speed variation without shutting down the drive side. 3) Forward and reverse rotation: When switching forward and reverse rotation at the load point, using the clutch allows the drive side to simply rotate in the forward direction. 4) High-frequency operation: For intermittent operation in rapid cycles, the frequency provided by repeatedly turning the motor ON and OFF is limited; therefore, using a clutch enables rapid response and high-precision braking. 5) Inch/jogging: When starting the machine or aligning positions, momentary clutch actuation is sufficient.

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