The rotary transformer is a precision sensor that uses the electromagnetic induction principle to measure the angle, and is widely used in CNC milling machine. Rotary transformers are made of fixed, rotor core and windings, durable, unlike the encoder in the photoelectric encoder vulnerable to shock or vibration damage, suitable for use in harsh environments. Milling machine servo motor in addition to optional optoelectronic encoder, but also optional rotary transformer, as shown.
The milling machine revolving transformer is actually a special two-phase motor. There are two orthogonal decomposition of winding stator windings, and the excitation voltage, when the rotor rotates, and the relative position of the rotor windings changes, the decomposition of the rotor winding of the induction voltage into a functional relationship with the rotor angle.
The induced voltage varies with the rotation angle of the rotor, and the induced voltage can be detected to detect the rotor rotation angle. In order to lead the rotor coil on the induced voltage, the actual use of the rotary transformer consists of two parts: a part of the decomposition device, composed of stator and rotor, the other part of the transformer. The primary winding of the transformer and the rotor winding of the resolver are fixed on the rotating shaft and rotate together with the rotor. The rotor winding lead wire in the resolver is connected to the primary winding of the transformer. The secondary winding of the transformer and the stator in the resolver are fixed to the housing, respectively. The stator winding of the resolver is applied with an excitation voltage, and the induced voltage of the rotor winding when the rotor rotates is fed by the primary winding of the transformer by the secondary winding of the transformer.
Above is the basic working principle of CNC milling machine rotary transformers, thank you for your attention.