The rotary transformer of CNC machine tool factory is a common angular displacement measuring device on CNC machine tools. It has the characteristics of simple structure, sensitive action, reliable T operation, low requirements for environmental conditions, large amplitude of input H signal and strong anti-interference ability. Signal processing is more complicated, and resolvers are widely used in semi-closed-loop controlled CNC machine tools.
According to the functional relationship between output voltage and rotor angle, resolvers can be divided into the following j basic types:
① sine and cosine resolver. The excitation of single-phase AC power supply is applied externally on the primary side, and the two output voltages of =ik r are related to the sine and cosine functions of the rotor angle respectively.
② Linear resolver. In a certain working angle range gate, the output voltage and the angle of rotation are linear functions.
③ Proportional resolver. It is similar to the sine and cosine resolver, with the addition of a device for adjusting and locking the rotor position in structure. In the system as a proportional component to adjust the voltage.
The structure of the rotary transformer in the CNC machine tool factory
The rotary transformer of the CNC machine tool factory consists of two parts, the stator and the rotor, as shown in Figure 4-16. Two distributed windings whose axes are perpendicular to each other in space, that is, two-pole two-phase windings, are embedded in the fixed and rotated iron core slots, respectively. CNC Machine Tool Factory S, S. and S: S. They are identical in structure for the purpose of setting the windings. R, wind and R, R are rotor windings, and their structures are exactly the same. The stator winding is the primary side of the transformer, the rotor is the secondary side of the transformer, the excitation voltage is connected to the primary side, and the frequency is usually /iOOHz, oOOHz, 1000Hz and 5000Hz. The mutual inductance between the stator and rotor windings of the CNC machine tool factory changes according to the sine and cosine laws of the rotor deflection angle. One signal changes in proportion to the sine of the rotor angle, and the other signal changes in proportion to the cosine of the rotor angle. The stator winding lead wire Directly to the terminal block, while the rotor windings are connected to the terminal block through slip rings and brushes.
The two-pole resolver commonly used in CNC machine tool factories has a pair of magnetic poles for the stator and rotor. In addition to this, there is a multi-pole resolver.

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