T7 stabilized camera or payload mount

The Gremsy T7 is a three-axis stabilized gimbal from Gremsy, a mid-size camera gimbal for industrial aerial payloads. It keeps a camera or sensor pointed in a set direction on pan, tilt and roll axes while the airframe moves, and it is built for inspection, mapping and professional aerial imaging work on multirotor and other unmanned platforms.

The T7 supports payloads up to 3,175 g (7 lb), and its camera cage is large enough for medium-format, thermal and hyperspectral sensors. Cage limits are 150 mm in depth measured from the center of gravity on the base plate, 130 mm in height above the plate (170 mm with the extension bar) and 180 mm in width. Gremsy lists payloads such as Phase One iXM cameras, the Corocam 8 UAV, Specim AFX10 and AFX17, Workswell Wiris GIS 320 and Senop HSC-2 as compatible. An optional extra camera slide allows a second camera on the same gimbal.

Motion control is handled by a 32-bit ARM microprocessor driving motors with encoders. Angular vibration is specified at ±0.02°, and each axis can be commanded at up to 180 °/s. Mechanical end points are ±345° in pan, ±150° in tilt and +80° to -264° in roll; the controlled ranges are ±300°, ±120° and ±45°. The inertial sensor is heated and temperature controlled to within 0.2 °C and uses a six-point calibration, so the gimbal can be set up for cold and hot operating conditions. A temperature sensor is built in, and operating modes are lock, follow or mapping, and inverted.

The gimbal weighs 1,860 g and measures 260 mm wide, 253 mm deep and 345 mm high. It runs from a 15 V to 52 V supply, which covers many battery architectures without a separate regulator. Static current is 300 mA and dynamic current 600 mA, both at 14.5 V, and locked-motor current is 4 A at 15.5 V. Operating temperature is 0 °C to 50 °C. The housing is rated IP5X, so the gimbal must be kept away from rain and direct water spray, and the power polarity must be checked before connection because reverse polarity can damage it.

For integration, the T7 provides USB 2.0, CAN, UART, S-Bus, Spektrum, PPM and Bluetooth 4.0, plus an auxiliary port with nine optional signals for functions such as camera trigger or AV signals. The HDMI quick-release interface carries video from the camera and allows the gimbal to be exchanged quickly between airframes. A CAN cable for a Pixhawk-type flight controller (COM2 or COM4), an S-Bus cable, two auxiliary cables, a power cable and a PWT cable are supplied. A COM2 port and the Gremsy SDK let integrators connect the gimbal to their own control systems.

Typical applications are aerial survey and mapping, infrastructure and industrial inspection, multispectral and hyperspectral data collection, and aerial cinematography. Before flight, the camera must be mounted and the three axes balanced, and a gyroscope calibration is recommended after the gimbal is moved to a different location.