JPS643000B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that can continuously measure the electrical error of a synchronized resolver.

Synchronous resolvers are used in various fields as detectors that can extract mechanical displacement as electrical signals. For example, when controlling the position of a table or tool in a numerically controlled machine, the amount of movement thereof is detected by a synchro resolver, and this signal is used as a feedback signal. When using a synchro resolver to detect rotation angle,
The detailed inspection is performed by measuring the electrical error of the synchro resolver. An ideal resolver called a resolver standard is used for this measurement. This resolver standard switches the secondary side tap of the transformer in the 3L resolver standard by rotating the dial, and the dial is set to set 1 to accurately adjust the value α.
Outputs the voltage sinαsinwt cosαsinwt. Figure 1 shows a commonly used method for measuring electrical errors in synchronized resolvers. 1 is resolver standard,
2 is the dial, S1' and S2' are the stator windings of the synchro resolver to be measured, _R1 ' is the rotor winding,
SH ₁ ′ is the rotor axis.

First, connect the sine output of the resolver standard to the stator winding S1'cos output of the synchronized resolver to be measured to S2'. First, the set value of the resolver standard is set to 0 degrees, the rotor is rotated so that the output voltage V _R1 ' of the rotor output winding of the synchronized resolver to be measured becomes OV, and this position is used as the reference point.
In this state, the set value of the resolver standard is set to α°, and the rotor winding output V _R1 ′ of the resolver under test is OV.
Rotate the rotor of the resolver to be measured so that the rotation angle θ' from the reference point at that time is read. The difference α-θ' between this θ' and the set value α of the resolver standard becomes an electrical error. In this measurement method, the measurer had to manually set the resolver standard and read the rotor rotation angle, which was very inefficient, and the measurement points were intermittent, making accurate measurements impossible.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a synchro resolver that can continuously change the rotation axis of the synchro resolver to be measured and continuously measure its electrical error, and that also allows easy measurement. The object of the present invention is to provide a measuring device that can measure the electrical error of.

Next, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a circuit block diagram of a synchronized resolver electrical error measuring device according to the present invention. In the figure, reference numeral 1 denotes a two-pole synchro resolver to be measured, which has two stator windings 1S ₁ and 1S ₂ and a rotor winding 1R. 3 is a drive motor for driving the rotating shaft 2 of the synchro resolver. A rotary encoder 4 has a shaft 4a directly connected to the rotation shaft 2 of the synchro resolver 1 to be measured, and outputs the rotation angle of the synchro resolver in binary code. This output becomes the set angle of the resolver standard. 5 is a carrier oscillator that generates a sinwt AC signal. 6 is a synchronous rectifier 7 and an amplifier 8 is a recorder. is a resolver standard, and when the setting angle α is input in binary code, the output terminals S1-S3 and S2-S
4 outputs the following voltage.

Vs ₁ −s ₃ = Asinαsinwt (1) Vs ₂ −s ₄ = −Acosαsinwt (2) However, A is a constant and Sinwt is a carrier. Angle θ
represents the case where the stator windings 1S ₁ and 1S ₂ are excited by 1S ₂ (1S ₁ is short-circuited) at the angle (electrical angle) normal to the composite magnetic field vector generated in the synchro resolver. Let it be zero degree. Also, θ' is the mechanical rotation angle of the rotor, which is θ=0 degrees, that is, 1
The position where the voltage induced in the rotor winding 1R becomes OV when only the _S2 coil is excited is defined as zero degree.

Resolver standard output Vs ₁ −s ₃ , Vs ₂ −s ₄
When applied to the stator windings 1S ₁ and 1S ₂ of the synchro resolver to be measured, respectively, the following voltages are induced in the rotor winding 1R.

V _1R ′=Asinθcosθ′sinwt−Acosθsinθ′sinwt=Asi
n(θ−θ′) sinwt(3) If the resolver to be measured is ideal with no error, the electrical angle θ is Tanθ=Asinα/Acosα=Tanα (4) and θ and α match. Generally, due to the error in the transformation ratio when the stator windings 1S ₁ and 1S ₂ are excited individually and the spatial orthogonal error of the stator windings,
θ and α do not match, so θ=α+Δθ (5). This Δθ is an electrical error.

In addition, in the measurement method according to the present invention, the mechanical rotation angle θ' of the rotor is set as the set angle α of the resolver standard, so θ=α at all rotational positions (6) Therefore, equation (3) becomes V _1R = AsinΔθsinwt (7) Since Δθ is usually on the order of several minutes, it can be approximated by V _1R =A′・Δθ・sinwt (8).

That is, when the standard setting angle is changed in synchronization with the rotor rotation angle, a voltage proportional to the electrical error at that rotation angle is output from the rotor winding 1R. The carrier component of this error voltage is removed in the synchronous rectification circuit 6, and after being amplified to a predetermined value by an amplifier, it is recorded by a recorder.

In the above embodiment, electrical error measurement of a two-pole type synchro resolver was described, but in a four-pole type synchro resolver, θ=2θ', and in a six-pole type synchro resolver, θ=3θ'...
In order to measure such a synchro resolver, a multiplier 10 is inserted between the encoder 4 and the resolver simulator 9, and the rotation angle signal output from the encoder 4 is set to a predetermined value depending on the type of synchro resolver to be measured. It is sufficient to multiply the result by the magnification and input it to the resolver simulator 9 as a rotation angle signal.

In addition, the electrical error tolerance of the synchro resolver to be measured is set in advance, and the electrical error of the measured synchro resolver covers the entire rotation angle.
If an inspection is to be conducted in which the electrical error within the tolerance range is passed and the electrical error exceeds the tolerance at any rotation angle is rejected, a judgment circuit 11 having a comparator may be provided. The measurement efficiency can be improved by inputting the output of the amplifier 7, and when the output voltage of the amplifier 7 exceeds a predetermined value, the measurement operation is stopped by emitting an alarm, etc., and the synchro resolver concerned is determined to be a defective product. . In this case, if the recorder 8 is unnecessary, it may be removed.

As explained in detail above, according to the present invention,
Since the electrical error can be determined while the rotation axis of the synchro resolver to be measured is continuously rotated, the measurement result is more detailed than the conventional method of measuring by discontinuously plotting the rotation angle of the rotation axis. is obtained. Further, in the present invention, since it is only necessary to rotate the rotating shaft of the synchro resolver to be measured, electrical error measurement can be easily performed, and automatic electrical error measurement is also possible.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram illustrating a conventional electrical error measuring method, and FIG. 2 is a circuit block diagram illustrating an embodiment of the present invention. 1... Synchro resolver, 2... Rotating shaft, 3...
... Drive motor, 4 ... Encoder, 5 ... Carrier oscillator, 6 ... Synchronous rectifier circuit, 8 ... Recorder, 9 ... Resolver simulator.

Claims (1)

[Claims] 1. A drive source that automatically rotates the rotation axis of the synchro resolver to be measured, an encoder that outputs an angle signal corresponding to the rotation angle θ of the rotation axis, and a drive source that is dependent on the angle signal output from the encoder. 2 whose amplitudes are (Acosθ) and (−Asinθ) and whose frequencies are the same
The two AC signals output from the resolver simulator are applied to the two stator coils of the synchro resolver to be measured, and the two AC signals output from the resolver simulator are 1. An electrical error measuring device for a synchro resolver, characterized in that it continuously measures an electrical error with respect to a rotation angle of a synchro resolver. 2. Claims characterized in that a multiplier is inserted between the encoder and the resolver simulator, and the rotation angle output from the encoder is multiplied by a predetermined magnification and input as an angle signal to the resolver simulator. 2. An electrical error measuring device for a synchro resolver according to item 1.