Resonant inductive position sensors and targets for measuring full absolute angle across 360°. The sensor connects to a Resonant Inductive Encoder IC such as the CAM622 to provide high-quality position and velocity data to a host device. The sensor design includes two pairs of PCB coils for detecting the target. Fine coils provide high accuracy and resolution and repeat 3 times around 360°. Coarse coils repeat once around 360° for full absolute measurement of angle. The matching non-contact target design includes a PCB printed resonator coil and SMD capacitor(s). These form a resonant circuit, owered without electrical contact by the sensor’s excitation coil. The resonator coil design is patterned to minimise the effect of misalignments on reported angle. The sensor and target are Type “B3” or “B5”. “B” refers to the resonator frequency band centred on 833kHz. “3” or “5” are the numbers of fine sensor coil periods per coarse.
Radial Misalignment | Angular Misalignment | Gap | 25 mm Sensor | 30 mm Sensor | 50 mm Sensor | |
Max. Linearity Error | no | no | 1 mm | +/- 0,05° | +/- 0,05° | +/- 0,025° |
Max. Linearity Error | up to 0,3 mm | up to 0,3° | 0…2 mm | +/- 0,14° | +/- 0,1° | +/- 0,06° |
Type B Sensor Reference Manual (PDF)
25mm Rotary Sensor Type B3 datasheet (PDF)
30mm Rotary Sensor Type B3 datasheet (PDF)
50mm Rotary Sensor Type B5 datasheet (PDF)
CAM622 Test Board with ABN output for Type B Sensors
CAM622 Resonant Inductive Encoder IC (ABN, SPI) for Type B Sensors
CAM622 evaluation kit with all necessary parts
C-Target for Rotary Sensor Type 6: 35mm/55mm Precision Through Hole
Rotary Sensor Type 6: 35mm/55mm Precision Through Hole