Permanent magnet brakes impress primarily due to their compact dimensions and their comparatively low weight. The torque achievable in the space available is twice as great as that which is typically achievable from spring-applied brakes, thanks to the high power density of the permanent magnets.
Furthermore, permanent magnet brakes are free from backlash and wear due to their design principle. Permanent magnet brakes are therefore ideally suited for servomotor applications, for example, in material handling and robotics.
The typical operating principles of permanent-magnet and spring-applied brakes and their typical friction pairs - steel on steel for permanent-magnet brakes versus organic friction linings on steel for spring-applied brakes - result in defined key features and typical fields of application of the two brake types. Permanent-magnet brakes are ideal for servo motors used on handling equipment and robots, for example. Their compact dimensions and relatively low weight make them the perfect solution for these applications.
If you are looking for magneta Permanent Magnet Brakes, please call us at (800) 894-0412 or email us at email@example.com we will do our best to help you find the magneta PM line brake that you are looking for at the most competitive prices possible. If you are searching for Kendrion high torque brake technical information (data-sheets) please use the datasheets or product selection guide page links.
Owing to the use of permanent magnets, their power density is twice the density of spring-applied brakes. In addition to their low weight and minimal abrasion, dynamic permanent-magnet brakes offer additional benefits that make them the number one choice in robotics. The abrasion resistance of permanent-magnet brakes is the result of their typical operating principle. The armature is entirely released by the spring. In spring-applied brakes, wear occurs during starting because the speed increase requires an air buffer to be created between the friction lining and the friction surfaces.
Additional wear may occur if the friction disc accelerates as a result of gravitational acceleration in vertical drive arrangements or as a result of centrifugal forces during rotation of the rotor blades of wind turbines, for example. However, this kind of wear usually affects only one friction lining. When used as a mere holding brake with emergency stop function, the behaviour of permanent-magnet brakes is different compared to spring-applied brakes. Owing to its specific design, the permanent-magnet brake has zero residual torque.
Abrasion only occurs during emergency stops. During operation, the armature is completely released by the spring. By contrast, the spring-applied brake requires a starting torque, which produces a certain amount of wear at each start. As already mentioned, additional wear occurs as a result of acceleration forces. In many cases, this additional wear cannot be determined accurately because, in general, only one side of the friction disc is affected. Permanent-magnet and spring-applied brakes also differ in terms of their behaviour across a specific temperature range. Permanent-magnet brakes have excellent temperature stability and provide a constantly high torque across the entire temperature range.
The situation is different with spring-applied brakes. Their temperature stability is decisively determined by the composition of the organic friction lining. In a way, this can be compared to the different types of car tyres developed for different applications. Similarly to a Formula 1 tyre which cannot be used in winter, some organic friction linings of brakes are simply not suitable for certain applications. Friction linings with a high coefficient of friction are characterized by good adhesion. The torques that can be achieved are high, but the friction linings are subject to early wear.
As far as the friction linings in spring-applied brakes are concerned, this means that linings with high coefficients of friction show faster torque reduction over the entire temperature range. In some cases the torque may drop to 50% at 120°C or -40°C. In general, it can be said that spring-applied brakes either reach excellent torques at the expense of their temperature stability or that their friction linings have excellent temperature stability at the expense of their coefficient of friction. However, it is worth noting that based on a given temperature range the torque of spring-applied brakes can be accurately rated for the customer-specified torque during the design process.
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ICN, HAN & M12 Connectors (only for IG128-24V-H incremental encoder) are available for the three-phase AC motors. A connector is used for the power connection, connection of the brake, and the temperature monitoring connection. The feedback and blower connections are implemented via a separate connector in each case. The connectors can be rotated by 270° and are equipped with a bayonet catch for SpeedTec connectors.
The INTORQ Range of spring-applied brakes is being expanded with the addition of the BFK470 series of sealed designs. This brake has been specifically developed for application areas that place increased requirements on the degree of protection. It is a self-contained system available in three sizes, and with braking torques of 40-250 Nm. It is ideal for use in wind power plants, cranes and textile machines.