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jvl20213cover story

Hannover Messe Hall 15, Stand H39

Integrated servo technology is enjoying increasing popularity in Europe and is causing many designers to rethink. Today, the systems are available in a wide variety of designs, dimensions and performance levels to meet all requirements. JVL presents motors from 400 W with integrated PLC functionality at the Hannover Messe.

jvl10213The Danish company JVL Industrie Elektronik A / S was founded in the year 1986. Initially conceived as a fixed idea in addition to studying, quickly developed a company from it. The basis for the early success was the use of the latest technologies, which the two company owners skillfully used in their products. At the beginning, the development and marketing focused on extremely modern and compact driver stages for stepper motors, which brought the young company a high level of acceptance in the market. By acquiring a Danish company, the product portfolio has been expanded to include AC and DC servo amplifiers. In the founders Bo Valeur Jessen and Mads Vernon Jørgensen, this move sparked the idea of ​​providing the engine and the booster as one unit.

Servomotor with amplifier and drive unit in one

The integrated servomotor is a complete AC servomotor with amplifier and drive unit in one device. It offers a modular, exactly fitting solution. The integration of the electronics into a motor was practiced until around the market launch of the first integrated servomotor before about 10 years only with inverters, but not with motors, which Servo performance could offer. For these compact servos, the engine, the Hall sensors, the encoder, the power amplifier and the controller have been redesigned to withstand shocks and avoid unnecessary temperature build-up, for example.

jvl30213The motor used is a brushless servo motor whose rotor consists of high-performance magnets. At the rear end of the motor is the Hall sender, which gives information about the position of the rotor magnets during startup. The signals from the Hall sensors ensure correct motor commutation by adjusting the voltage at the 3 motor phases to optimize the magnetic alignment for maximum torque with minimum current. After motor startup, only the encoder located behind the Hall sender is responsible for the feedback of position and speed, and motor operation is 100% digital.

The control circuit that controls the torque, speed and position consists of a digital controller and driver stage. The computer center is an extremely powerful high-performance microprocessor. The processor receives its specifications via a built-in expansion module and accordingly performs the digital current, speed and positioning control. The signals of the optical or mechanical encoder are processed to determine the speed and position.

The integrated servo motor is equipped with different operating modes to work with the Basic configuration to cover as many applications as possible. The operating mode is selected via a parameterization software which includes speed, torque control or positioning via ± 10 VDC as well as control via pulse / direction signal. The latter offers the simple option of upgrading a previous stepper motor application to servo performance. The zero setting of the drive can be selected according to the application, either by reference point switch, a mechanical stop in the torque procedure or setting the zero point by software. This is only required once for a servomotor with a mechanical absolute value encoder.

Decentralization of system intelligence

The advantages of an application solution with compact servomotors include the decentralization of system intelligence and the saving of expensive cables between motor and amplifier. This simplifies installation, saves cabinet space, eliminates wiring errors and reduces EMC issues. Another advantage is the adaptation of the drives to the needs of the application through the use of expansion modules. In addition to modules with "Nano PLC", the conventional field buses Profibus, CAN open, Devicenet and Modbus, but also more exotic networks such as Bluetooth, Zigbee and WLan are available. Of course, Industrial Ethernet modules such as Ethercat, Profinet, Powerlink, and Ethernet / IP are also offered.

At this year's Hannover Messe the company JVL presents another highlight. The default Integration of the well-known PLC functionality into motors as from 400 W. This gives the user the opportunity to process motor-specific or application-specific program parts directly in the motor in real time, without detours via the PLC.

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