We are announcing Version 2 of the EPM, Electro Permanent Magnet and the OpenGrab CAN daughterboard (OGCAN). A simple solution for cargo gripping for UAV’s and robots.
Introduction EPM V2
Supported are RC PWM and CanBus with the CanAerospace daughter card. The EPM has an onboard PIC12F MCU with an in circuit programming header to allow easy reflashing.
Even lower power consumption; 400mA for 400ms at 5V per cycle or 800mJ.
On board tactile push button: Allows toggle testing the EPM on/off having only the power connected
Cycle time: The Cycle time is 400ms or 2.5Htz. This solves the problem when the EPM is turned on and the target does not make perfect contact, the majority of the energy is used to move the target into place rather than realign the magnetic domains, resulting in a much reduced holding force. With the fast cycle time one can turn the EPM on a few times in a row to make sure proper contact has been made.
Full bridge Thyrisotor drive circuit increases efficiency and reduces capacitor size .
Reduced magnetic interference allows mounting within 5cm of a magnetometer (please test it with your application)
Lighter- mass has been reduced to 47grams
OGCAN is an open hardware CAN bus interface that allows to control OpenGrab EPM and monitor its state via CAN bus or serial CLI. Supported CAN protocols: CANaerospace, UAVCAN (full UAVCAN support comes April 2014).
OGCAN is built on STMicroelectronics STM32F103 MCU running RTOS ChibiOS, implements one CAN bus interface (ISO 11898-2, up to 1 Mbps), one TTL UART for CLI and optional CAN termination resistor (via jumper). OGCAN can be directly connected to EPM via two board-to-board connectors, as shown below.
Supported CAN protocols: CANaerospace, UAVCAN"