Absolute precision
The new generation of motion measurement

The deve­lo­p­ment with the pro­ject name IMU+ has meanwhile 
resul­ted in our new sen­sor genera­ti­on with the name GEMAC Motus®.

Highly accurate measured values even with movement 

Incli­na­ti­on sen­sors are among the stan­dard com­pon­ents in mobi­le machi­nes. Until now, sen­sor manu­fac­tu­rers, as well as users, have often been con­fron­ted with a chal­len­ge: The incli­na­ti­on mea­su­re­ment of the­se sen­sors based on con­ven­tio­nal acce­le­ro­me­ters, which can­not dis­tin­guish bet­ween the acce­le­ra­ti­on due to gra­vi­ty and other exter­nal acce­le­ra­ti­ons. GEMAC from Chem­nitz is now respon­ding to the incre­a­sing demand for acce­le­ra­ti­on-com­pen­sa­ted sen­sors with its new IMU+ iner­ti­al mea­su­re­ment system.

Three years of development work on the algorithm

The new sys­tem enab­les 6‑axis moti­on detec­tion on the mobi­le machi­ne, based on raw data acqui­si­ti­on for acce­le­ra­ti­on (3‑axis) and rota­ti­on rate (3‑axis). High-pre­cisi­on data pro­ces­sing is per­for­med in the sen­sor using a sophisti­ca­ted sen­sor fusi­on algo­rithm. Inte­gra­ted sen­sor fusi­on fil­ters sup­port the user in ori­en­ta­ti­on cal­cu­la­ti­on by sup­pres­sing extern­al­ly acting accelerations.

Rico Gräßler, an engineer at GEMAC and team leader sensor development at IMU+:

From the very begin­ning, it was the requi­re­ment in deve­lo­p­ment to achie­ve a new dimen­si­on of accu­ra­cy by com­bi­ning an abso­lu­te mea­su­re­ment with a spe­ci­fic eva­lua­ti­on algo­rithm. Three years of deve­lo­p­ment time inves­ted in the self-desi­gned algo­rithm alo­ne. The new IMU+ sys­tem offers the decisi­ve advan­ta­ge over the pre­vious IMU sys­tems that, in addi­ti­on to the raw data for acce­le­ra­ti­on and rota­ti­on rate, it can also out­put intern­al­ly cal­cu­la­ted values such as tilt or rota­ti­on ang­le in dif­fe­rent axes. So in the future, it will be able to detect devia­ti­ons in the defi­ned machi­ne sys­tem even more quick­ly, enab­ling the user to take tar­ge­ted action”.

By com­bi­ning and cal­cu­la­ting the­se six mea­su­red values, one mea­su­ring sys­tem can now be inte­gra­ted ins­tead of several. The user saves space and con­si­der­ab­ly redu­ces the inte­gra­ti­on effort. Sin­ce time-cri­ti­cal cal­cu­la­ti­ons now per­for­med in the sen­sor sys­tem, the user saves addi­tio­nal time. Also, the new IMU+ offers signi­fi­cant­ly impro­ved sta­tic and dyna­mic accu­ra­cy com­pa­red to the exis­ting sensors.

IMU+ Produktbild

The new sen­sor generation:
IMU+ iner­ti­al mea­su­re­ment system.
High­ly accu­ra­te mea­su­re­ment values des­pi­te movement.

Mobile monitoring for mobile machines

Auto­ma­ti­on has long sin­ce found its way into many indus­tries. Com­mu­ni­ca­ti­on bet­ween several devices makes work more strai­ght­for­ward but also incre­a­ses the deman­ds on sen­sors, elec­tro­nics, and net­wor­king of a mobi­le machi­ne. Unplan­ned mal­func­tions can occur due to sys­tem errors and cau­se cost-inten­si­ve downtimes.

With the field bus dia­gnostic sys­tems CAN-Bus Tes­ter 2 and CAN­touch© deve­lo­ped by GEMAC, para­me­ters can be tes­ted alrea­dy during the machi­ne design pha­se, to detect fre­quent sources of error at an ear­ly sta­ge. A qua­li­fied final pro­duc­tion inspec­tion and sub­se­quent­ly through tar­ge­ted long-term moni­to­ring over the ent­i­re life cycle of the mobi­le machi­ne (pre­dic­ti­ve main­ten­an­ce), the requi­re­ments for avai­la­bi­li­ty, relia­bi­li­ty, and long-term sta­bi­li­ty met. GEMAC offers its dia­gnostic devices for the dif­fe­rent inter­faces CAN, CANopen, Device­Net, and SAE J1939. “GEMAC is the world’s only sup­plier of such dia­gnostic sys­tems that mea­su­re phy­si­cal­ly and thus pro­vi­de reli­able infor­ma­ti­on about the bus qua­li­ty in the mobi­le machi­ne,” says Ralf Mei­sch­ner from the Fiel­dbus Deve­lo­p­ment Team.

GEMAC CANtouch CAN-Bus Messgerät

Fiel­dbus dia­gno­sis sys­tem CAN­touch©

Research and development part of DNA

For 28 years, GEMAC from Chem­nitz has been deve­lo­ping and manu­fac­tu­ring modu­les, com­pon­ents, and com­plex assem­blies accord­ing to indi­vi­du­al cus­to­mer requi­re­ments in the fiel­ds of sen­sor tech­no­lo­gy, mea­su­re­ment tech­no­lo­gy, and medi­cal elec­tro­nics. With a team of over 70 experts, many years of indus­try expe­ri­ence, and exten­si­ve deve­lo­p­ment and manu­fac­tu­ring know-how, GEMAC has beco­me an out­stan­ding spe­cia­list for incli­na­ti­on and acce­le­ra­ti­on sen­sors as well as for Fiel­dbus dia­gnostics of CAN-based systems.

Direct con­ta­ct:

Tho­mas Kiessling

head of sales


Pho­ne: +49 (0)371 3377–211

Mar­ke­ting / Public Relations:

Laris­sa Anton


Pho­ne: +49 (0)371 3377–103

GEMAC Chem­nitz GmbH

Zwi­ckau­er Str. 227, 09116 Chemnitz


The arti­cle first publis­hed in the Bau­ma­ga­zin,  May/June 2020