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Intorq’s new release calliper brakes, as found on the Techdrives website, are designed for safety-critical applications with large masses or falling loads.

Effectively, these calliper designs are developed from disc brakes and their kidney shape enables the creation of compact assemblies with disc diameters from 150mm to 850mm.

Interruption of the DC supply voltage results in a full clamping force being applied to the brake disc.

Depending on dimensions and the number of callipers, the brake torque can be from 100Nm to 10,000Nm.

The main calliper brake model, the BFK466, is robustly constructed for safety-critical applications.

Multiple helical springs apply force to a floating armature plate, which clamps onto a rotating brake disc – normally part of the machine construction.

High-stability friction material between the brake and the rotating disc increases the resulting torque.

To release the brake, a DC voltage is typically applied to four electromagnetic coils inside the brake, which pull back the armature plate to a released position, leaving no residual torque.

Intorq’s ‘cold brake’ technology applies over-excitation of the coils for the fast release and then a lower holding current.

This reduces energy consumption and the heat generated and also speeds the brake re-engagement when the DC supply is interrupted.

As well as the reliable design concept of multiple springs and coils, Intorq is said to give high priority to long service life and safety.

B10d lifetime data is available to allow evaluations of the performance level of machine braking systems; for the BFK466, it is 12 million hours.

The concept of a ‘redundant calliper’ is normally used in safety-critical applications, so that if one calliper fails there is another available to stop the load.

This is most effective where there are several callipers.

For example, a brake with five active callipers would only require one more to be added for redundant safety – on the basis that only one calliper would ever fail at one time.

As a result, costs are minimised and the redundant calliper only adds an extra 20 per cent torque, avoiding the over-braking of lighter loads.

Intorq also fits the micro-switch detection of brake actuation so a fault is immediately identified.

Spring-applied calliper brakes are described on the Techdrives website.

The BFK463, a new model, is suitable for smaller drives with typical braking torques of 100Nm.

There is an intermediate model, the BFK456, and a larger model, the BFK466, which can deliver around 1,500Nm per calliper.

These brakes are targeted at lifts and hoists, particularly where the motor is a direct drive without a gearbox.

They are also suitable for general braking duties for high loads, for example where safety integrity requires braking at the low-speed output rather than through a gearbox.

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