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TTK70 motor feedback systems for linear measurement from Sick

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The TTK70 linear measurement system is a compact motor feedback system with a HIPERFACE interface. Its magnetic functional principle, long measurement lengths and very high resolution expand open the potential uses for absolute position detection, e.g. on linear motors. 

Sick Stegmann offer drive producers both rotative and linear motor feedback systems with integrated HIPERFACE interface.

The TTK70 was developed in response to a trend towards direct drive technology, particularly in high-tech applications, because unlike rotative drives, whose movement is ultimately “linearised,” they offer considerably greater precision, speed, dynamism, rigidity and regulatory quality.

While mechanically coupled systems (such as spindles or toothed belts) are increasingly being replaced by linear drives, the regulatory circuits of machines often still retain a HIPERFACE infrastructure for data transmission from the “old rotative” times. The TTK70 linear motor feedback system combines the above-mentioned drive and communication aspects.

The TTK70 linear measurement system consists of an “absolute” reading head and a 10 mm wide and up to 4,096 mm long magnetic tape as a reference. Compared to optical linear systems, the magnetic functional principle offers considerable advantages regarding price, immunity to contamination, and availability. The rugged metal housing of the reading head (including the plug connector) is roughly of the size of a matchbox. It is specified for a maximum operating distance of 0.4 mm between the tape and the TTK70 sensor head, which contains advanced sensor and evaluation technology.

The sensor circuit board aligned on the measurement level is equipped with Hall sensors on two parallel tracks. Their arrangement corresponds to the division of the magnetic tape into an incremental and an absolute component. In order to calculate the absolute position value during operation, the reading head first detects the absolute starting position via Manchester coding when the linear motor starts, and then determines all further actual drive positions via the increments on the magnetic track or sine/cosine signals.

The values thus formed by the TTK70 are transmitted to the higher-ranking evaluation electronics of the linear drive via the asynchronous semi-duplex HIPERFACE interface. The motor feedback system’s power supply is provided via two of the eight wires. Two more wires are required for the bi-directional, bus-enabled parameter channel via which, among other things, the absolute position data are transferred to the governor in digitalised form. The two remaining pairs of wires form the real-time process data channel.

Sine-shaped increment signals are transferred via these in analogue form and interpolated in the governor. The HIPERFACE serves as an interface standard for all common servo-drives covering all applications with a single type of signal cable. Another advantage is the possibility of autonomous initialisation of the drive system through the use of an electronic type label in the motor feedback system.

As a result of the analogue transmission of the sine-shaped incremental signals with a pole or period length of 1 mm as well as, for example, 10-bit interpolation, the TTK70 achieves a high resolution of 1 µm. The system accuracy is < 10 µm.

In addition, the measurement system is equipped for the high speeds that are common in direct drive technology. Thus, the TTK70 can generate and transmit sine/cosine output signals at speeds of up to 10 m/s. In adjustment and commissioning terms, the measurement system offers high tolerance regarding alignment of the sensor head to the magnetic tape. This considerably simplifies mounting and commissioning, and optimises availability during operation of the linear unit.

The TTK70 measurement system is available for linear drives as ready-to-connect solutions. This will be advantageous for a range of machines and applications, including eroding machines, handling systems in semiconductor production, assembly and placement machines, vertical lifting systems, pick & place applications in electronics production or the food industry, measurement and inspection machines, labelling plants, or multi-axle gantry systems.

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