Skip to main content
FW version: Stable

Motor sensors

Electric motors with permanent magnets are manufactured with various rotor position sensor types. The controller supports only some of them and paying attention to its selection is necessary.

Supported rotor position sensors are:

Sin-Cos signal is composed of two analog signals of sinusoidal shape. Signals are phase-shifted by a quarter of the period and one period of sine (or cosine) signal corresponds to one mechanical turn of the motor (see pic. below). This type of signal is usually produced by a sensor consisting of a cylindrical permanent magnet glued to the rotor and a sensor chip located on the stator at a defined distance from the cylindrical magnet.

SinCos signal

Sin-Cos motor sensor is supported by "a" Motor sensor assembly variant.

info

BLDC driver algorithm does not support Sin-Cos sensor

ProsCons
Absolute and continuous position sensingTypically sense mechanical revolutions. Angle multiplication error could occur when using a motor with many pole pairs.
Suitable for VECTOR driver algorithmAnalog interface – could be sensitive to electrical interference.
Suitable for position servo drivesNeeds output offset calibration (can be done automatically by the controller)