【正文】 or overheating in advance, taking into account, and to take measures to prevent overheating. In the past to protect the motor way is to use fuses, overcurrent relays, thermal relays, thermostats, etc., but these approaches also have their pros and cons of this change for the electrical device load devices, is absolutely reliable protection method is not. Must therefore take all methods bined approach. However, as the load on each electrical device is different, it is difficult to propose a unified approach. In most cases, but generally, you can also find mon ground. Overload protection taken by the way, be grouped into two types: 1. Changes in input current to the motor to judge。 2. Lockedrotor protection of motor thermal relay 3. Pairs of short circuit faults using fuse or overcurrent relays. Valve electric device to prevent overload of the right choice and is very much related and should pay attention to.In consideration of economic aspects limiting torques is a continuous challenge when developing Torque Limiters as an overload protection. The new generation of the backlashfree Torque Limiters. The new generation of the backlashfree Torque Limiters has been designed for being used in powertransmission and servo applications. Important requirements such as beingFor limited installationsThe further development and optimization of the already well established backlashfree Torque Limiter series SK has brought about an appropriate design for each application. The transmittable torques can be accurate defined and set. Even in regard to restricted installation space now, the couplings represent the latest stateoftheart.Torque limiters with damping PropertiesR+W has designed and launched a new overload protection with damping Properties. This bines the known elastomer couplings with a torque limiting portion.Between the safety element with clamping hub and the other coupling half, there is an elastomer insert made of thermoplastic polyurethane (TPU) absorbing the drive vibrations. Owing to its elasticity, it is able to pensate axial, angular and lateral misalignment, vibrations, and impacts. During operation in machines with frequent impact, change or vibration load, its high damping capacity can have a positive effect on the service life of the connected aggregates. This however only applies to firstquality couplings which consist of individual elements showing the necessary truth of running and concentricity of the bores.Poor manufactured couplings may cause pulsating radial forces onto the rotational axle during operation.Choice of different Shore hardnessThere is a choice of elastomer inserts with different Shore hardness 98 A, 64 D, and 80 A. Costly solutions where the coupling was sealed with a housing are therefore unnecessaryThe plete programm is additionally offered in stainless steel version. Nitrocarburizing, oxidizing, or nickelplating is possible for steel types. Aluminum can be anodized, other materials and surfaces can be offered on request.Function of the patented R+W prinzipleR+W’s patented operational principle guarantees reliable and safe protection against overload even with heavy loads. Due to the spring loaded ball detent design of the coupling high repeating accuracy of the preset disengagement torque is reached and continuous operation is ensured when using a ball detent design Torque Limiter vs. a slip clutch. Overload protection does not allow any ofmises in regard to reliability and quality of the individual ponents although Torque Limiters are always designed for an economic use. R + W conceived a solution which stands out.Function always assuredAt the factory the Torque Limiters are adjusted to the exact disengagement torque requested by the customer. After installation the disengagement value can easily be changed to siut actual requirements.The torque adjustment range is engraved on the adjustment nut. An outstanding feature opf the R+W design is an easy radial adjustment which clearly facilitates adjustment of the coupling. Due to the positive stop on the adjustment nut, disengagement of the coupling is allways assured.For each coupling model there are four different function systems available:single position = attempting reengagement automatically in the same position (360176。 = no disengagement occurs but an external sensor can be instantly triggered.With these four function systems R+W offers