Product Description:

The 11BRW-300-B-4 is an electromagnetic resolver produced by Danaher within the Dynapar Resolvers series. Used in industrial automation, the device converts mechanical shaft angle into two analog output signals that support closed-loop motor control and position feedback. The resolver can be installed in servo drives, indexing tables, or robotic joints to provide absolute angular data without relying on optical sensing elements that may be affected by high temperatures or vibration.

The sensor’s primary winding is designed for an excitation level of 12.0 Vrms at a reference input current of 10.9 mA. When driven at a carrier frequency of 400 Hz, the resolver produces sine and cosine secondary signals whose magnitudes correspond to the shaft position. Internal coupling between the primary and secondary coils provides a transformation ratio of 1.75, meaning the secondary amplitude is 1.75 times the primary amplitude under nominal operating conditions. The electrical phase shift is 12 degrees, and the connected resolver-to-digital converter can account for this offset when processing the output signals. Proper excitation and signal conditioning allow the controller to calculate angular position continuously as the rotor turns.

Residual output at electrical zero is limited to a null voltage of 30 mV, helping minimize position error when the rotor aligns with the stator reference mark. The resolver has a speed ratio of 1, so one electrical cycle corresponds directly to one mechanical revolution. Its primary accuracy is 10 arc-min, making it suitable for medium-precision motion axes such as conveyor steering systems and tool changers. The primary winding is housed in the stator, allowing excitation to be applied through the stationary portion of the resolver while the rotor follows shaft movement. The analog secondary outputs can be connected to compatible conversion electronics that calculate shaft position from the relative sine and cosine amplitudes.