Many friends are curious about the rotary transformer, and hope to learn more about what exactly is a rotary transformer? Vacuz gives you an introduction to it!

What is a rotary transformer:

Rotor transformer is often used in cars, such as Toyota, BYD, is a position sensor, mainly for the drive motor or generator, can accurately detect the direction of the rotor, position and speed, so as to carry out effective control, as if the drive motor “eyes”, usually also called the corner sensor or resolver.

Rotor transformer structure composition:

The rotor winding is almost the secondary side of the transformer, where the induced voltage is obtained under electromagnetic induction; the stator winding is almost the primary side of the transformer, where the excitation voltage is input and the frequency is controlled by the control unit.

Rotor transformer stator mainly consists of three coils, respectively, the excitation coil, 2 into 90 degrees of the output coil, a sine, a cosine.

How to wind the stator of a rotary transformer:

Rotating transformer stator winding process is very important, the general wire diameter of about 0.1mm, most of the winding method, need to wind multiple layers, the number of turns is also more, also need to wrap the terminal pin, the time is generally longer, manual winding is not realistic, rotary transformer manufacturers use professional 2/4/6 stations high-speed internal winding machine, not only can quickly complete the rotary transformer stator winding work, and the winding effect is good, will not hurt the wire break. Will not hurt the line broken line.

Rotating transformer working principle:

Excitation coil through the controller, input a certain alternating current, the specific frequency generated added to the two output coils, this time will not affect the rotor speed, the size of the stator-rotor gap, following the rotor rotation change, so that the two coils of the waveform peak also with the rotor position and change.

Whether it is a motor or a generator, the output coil peak detection, connect these results into a theoretical waveform, through the difference between the two coils, you can estimate the rotor position, according to the two coils theoretical waveform phase difference can determine the direction of rotation, through a certain time range, how much the rotor angle change, you can roughly calculate how much rotational speed.

The above is the working principle and structural composition of the rotary transformer, and the stator winding method, to understand these basic knowledge and details, to help everyone on the rotary transformer, have a deeper understanding!

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