The customer told us they wanted to replace an old resolver on a servo motor with something digital, but without redesigning the motor’s mechanical mounting. This comes up a lot when a machine builder is moving away from analogue resolvers to digital feedback, and the Hengstler ACURO AD36 was built for exactly this swap.
This looks simple, but “resolver-compatible” is a real mechanical spec here, not just a phrase – the AD36 mounts to the same installation footprint as a size 15 resolver, so it can go into a motor originally designed for one without machining changes. It uses an 8 mm through hollow shaft (not the single-sided version like the AD35), supported by dual ball-bearings and a flexible torque support, and is built for BLDC servo motors with small frame heights.
In actual application, the AD36 gives up to 22-bit single-turn plus 12-bit multi-turn resolution using a geared optical multi-turn mechanism (not battery-backed), runs on SSI or BiSS digital interface, handles continuous speeds up to 10,000 rpm, and is rated across a wide -40°C to +120°C operating range – useful if the motor sees cold starts as well as running hot.
From our experience, before we quote this, we would normally check the resolver frame size you’re replacing, the motor shaft diameter at the mounting point, and which interface (SSI or BiSS) your drive is set up for. Hope this helps.
