Permanent magnet couplings, clutches and brakes are both safe, reliable and particularly economical to operate. They work without wear or contact, are virtually maintenance-free, operate with low bearing friction (concentric ring couplings) and, under conditions of normal use, have an almost unlimited working life. They are particularly
useful when it is necessary to ensure a strict, physical separation between the drive and driven side.
Permanent magnetic couplings, clutches and brakes can be divided into three basic types:
• Synchronous couplings, which include disc and concentric ring couplings
• Hysteresis clutches and brakes
• Eddy current clutches and brakes
For all types of coupling, clutch and brake the relevant efficiency equation is:
P1-Pv-P2=0
P1 is the influx power from the drive side,
P2 is the transmitted power in the driven side,
Pv is the power loss via the transmission mechanism in coupling, clutches and brakes.
For synchronous couplings Pv=0, as the slip, S=0 (instructions about applications and installation). On the drive and driven sides, permanent magnets are set opposite one another with an equal, even number of poles, mirror balanced (disc couplings) or are rotationally symmetric (concentric ring couplings). The magnetic requirements for synchronous couplings of
• permeability µrev ➝1
• coercive field strength and remanence flux density as great as possible are best achieved using ceramic barium, strontium ferrite material, or combinations of rare earth elements and cobalt.
In hysteresis clutches and brakes one half of the synchronous coupling – for cooling reasons, the drive side is advised – is replaced by a ring or disc made from a permanently magnetic material with relatively greater remanence and permeability and correspondingly smaller coercive field strength, so that this half of the coupling – against some resistance – can be magnetically reversed from the other half). In eddy current clutches and brakes, Pv>0, as S>0. One of the halves of the synchronous coupling – preferably the drive side – is replaced by an iron-backed electrical conductor in ring or disc form. disc magnetic coupling
The torque values printed here are minimum values and may be exceeded.
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