Our customer DEPRAG manufactures a large range of electronic and pneumatic screwdrivers. For the electronic screwdrivers we have done most of the hardware design and all of the real-time control software. The screw tightening process can be freely programmed through a web-interface. Statistics, error checking, graphical analyzes and other features provide perfect monitoring of the process and a high level of quality control. Our motor controller design was optimized for precision, all engineering decision were taken in favor of minimal torque fluctuations and maximum speed.
The torque measurement is performed indirectly by measuring the phase currents of the 3 phase synchronous motor and applying a mathematical model for the torque at the spindle. The model was also designed by us and optimized in close cooperation with DEPRAG. As a result these screwdriver products provide high precision at moderate costs, sparing the need of an external torque sensor.
For further information please refer to the DEPRAG web-site.
This controller has been designed for fast, high precision industrial screw driving applications. The unit is capable to control very small torque values required for miniature screws used for instance in mobile phone mounting. Process monitoring and control is implemented through a user-supplied web-site.
We engineered this unit for cleaning applications to control brushes, a drive motor and a vacuum cleaner in one unit. The device is very compact and low-cost. The user can take full advantage of the PWM capabilities for silent and ECO operation modes on all loads.
We engineered this unit for cleaning applications to control a brush, and a vacuum cleaner in one unit. The device is very compact and ultra low-cost for an entry level cleaning machine.
This controller has been designed for fast, high precision industrial screw driving applications. The unit is capable to control a wide range of torque values between 0.05 – 4.5 Nm required for either miniature or larger screws. Process monitoring and control is implemented by an external Linux board and through a user-supplied web-site.
This unit was designed as an add-on module for cleaning machines that require road-worthy lightning. The module is universal so that 12 V lamps and valves can be used for all system voltages. All loads can be controlled through the RS485 interface, the applicable current limits can be arbitrarily set.
We designed this module for performing independent lift operations for parts of a cleaning machine. An additional motor output is provided for an auxiliary brush. All functions can be commanded through the RS485 interface.
This is a high power motor controller for electric drive applications. Machines up to 2 tons gross weight are being controlled with this device. Because of the inherent danger of such machines, all critical control paths are 2-way redundant. Speed, drive direction and current limits can be freely programmed through the RS485 interface.
There are two extension connectors provided to control further equipment if necessary.
High cost-efficiency: One high-side current measurement is shared between the three main outputs. The current sensor is multiplexed through intelligent software design. The three currents are precisely measured and offset calibrated every millisecond.
The scooter shown is one example of the many DC-motor control projects we have worked on. The scooter's motor current is up to 70 amps. The design includes a battery charger with a switching power supply. The motor and charger current are precisely controlled by a Microchip PIC micro controller.
The controller algorithm maintains a battery charge status and communicates that to the user by means of an LED display. Comprehensive error analysis and fault tolerance is incorporated. Our product is much more compact in its physical dimensions (See photo) as its predecessor designed by a competitor. Also lower component count provides higher reliability and lower manufacturing costs.
Through the cooperation with us, our customer MZ improved its competitive strength with a better product and better profit margins.
For further information on Microchip micro controllers that are highly versatile for a variety of applications while consuming only minimal quiescent power, check the Microchip home page.
This unit is being used as an id-tag of an electronic screwdriver. Calibration information specific to the load attached is stored in EEPROM and Flash. Our motor-controllers can read the information and control the motor with optimum performance.
We designed this unit as a master controller of a cleaning machine. The DC/DC converter is a pure software solution that also implements the power-cycling and the reset of the main controller. In sleep mode the DC/DC converter consumes minimum power before being waken up by a user action.