JPS58182559A - Detecting apparatus of speed of revolution using resolver - Google Patents

Abstract

PURPOSE:To detect the speed of revolution, by carrying out a frequency-voltage conversion of an output of a resolver. CONSTITUTION:A two-phase exciting signal is given from a two-phase sine wave generator 2 to two phase stators windings Walpha, Wbeta of a resolver 1. An output signal of the resolver 1 is shaped 3 to a square wave and is inputted into the second monomultiple vibrator 11 and the second monomutiple vibrator 12 through an invertor 9 and the outputs of the mono stable multivibrators 11, 12 are added and are converted into direct current voltage by a low-pass filter 14. A bias direct current voltage is set so that the output voltage of the filter 14 becomes zero when the number of revolutions of the resolver 1 is zero.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a λ-phase excitation winding which is spatially arranged at different electrical angles and different phases, and a detection winding for detecting the rotational position of a rotating body. The present invention relates to a device for detecting rotational speed using a resolver having the present invention.

1 is the number a on the output voltage side of the detection winding of the resolver with co-phase excitation, and 1 is f, : f±Δf, (Δf=NP//λO)...(1
Formula) f is the carrier (excitation) frequency, M is the rotation speed (r, El wind), and P is the number of poles.

The sign is dependent on the direction of rotation V (if 10 is normal rotation, then - is reverse rotation.

The detection of one rotational speed is given by the following equation, and is achieved by extracting the frequency difference between the output voltage frequency f and the carrier frequency.

This specific circuit is disclosed in Japanese Patent Application Shoj3-≠010t (Japanese Unexamined Patent Publication No. Shokai-/J/73), and is shown in FIG. 7 for clarification.

Figure 18 is a block diagram of a conventional device for λ-phase excitation. The child winding WD can be placed on the stator side and made brushless, but here it is placed on the rotor side.

Also θ. is the electrical angle.

is λ for passing two-phase excitation current through the windings Wa and Wβ.
phase sine wave generator (excitation power supply), J, waveform shaping circuit for shaping the output signal of the 44-bar excitation power supply λ and resolver l into a square wave, j, AiX for converting the square wave pulse train into electricity and pressure. Frequency-voltage (f/' converter, 7 is f/ma converter j, differential amplifier for extracting deviation voltage of t,
Generally, the following (set) is attached to the detection winding WDK of the 0 resolver l, which is the JU detection speed output terminal.
A voltage indicated by , is induced.

eo= x 5stn(ci+t+#,)
-""・(J formula) % formula % Electrical angle θ of the rotor of 0° Hare solver l: f(N) Rotational speed NO function of one remoter.

It is.

Is (formula 2) the rotation of the resolver rotor? (2) Depending on the direction of rotation, a phase-shifted pA or frequency-modulated signal can be obtained. Δf is one change in frequency according to rotational speed.

Therefore, the carrier (excitation) frequency f of the excitation winding and the output voltage frequency fR of the detection winding total frequency - 1 pressure (f/
V) If the difference between the converted voltages is taken out, a component of frequency change ±Δf corresponding to the speed can be obtained.

Now, when detecting the rotation speed using this method,
K is used to increase the extraction feeling #(Δf/f).

■ The ultimate resolver? Pt - Increase.

0 Select a low carrier frequency ff.

There is a trick, but due to manufacturing limitations, it is not possible to increase the number of poles. Although the carrier frequency (2) can be easily changed, lowering the frequency often causes the problem that the detection response deteriorates.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lamp of the present invention and a rotational speed detection device for use on a resolver which overcomes the drawbacks of the conventional lamp.

FIG. 2 is a block diagram showing the configuration of the first embodiment of the present invention.

In each drawing, the same reference numerals represent the same or similar parts.

This is an inverter that inverts the output of the shaping circuit 3.

//l'J The first monostable i-multivibrother converts the output signal of the shaping circuit 3 into a pulse train with a constant periodic pulse width, and the inverted signal of the output of the 72nd position shaping circuit 3 is converted into a pulse train with a constant periodic pulse width. Xieko's monostable multivibrator converts into a pulse train with 13 is a monostable multivibrator //
Adder for adding pulse train of /2, adder 13 for /'l
A low-pass filter that converts the Norse sequence added in to DC pressure, /J is a high-speed low-pass filter whose rotation speed is O (r, n wind), so that the output voltage of /9 becomes Q (v). The output DC voltage /A is the detection speed output terminal. Next, one of the circuits in Figure 2 above is converted to #4 by the time chart shown in Figure 3. Changes in voltage and voltage from ■ to ■ marked on the circuit.

λO/ represents the output waveform of the shaping circuit 3, and -Qλ represents the output waveform of the innominate. Monomulti//.

/2 to -O/, the rising edge of the waveform represented by Q is given a constant pulse width of s + Tt (there is no limit to 'r, ,'r,) K conversion (203 Fuyopi 20g) .

When these are added by the adder 13, the carrier til wave V
A pulse train λθj with a frequency multiplied by In the case of n rr<
And the output waveform of the adder 13 changes as 204 and λ07, and similarly, when it is rotating in the reverse direction, Hiro 201
．． It changes like 20 ri.

Therefore, if the bias voltage 15 is applied so that the output voltage of the low-pass filter becomes 0 (V) when the rotor is stationary, a countercurrent voltage proportional to the number of rotations can be obtained. The positive and negative polarities of the voltage values are determined by the rotor rotation direction. Also, as a multiple example of the speed λ of the present invention, as shown in the time chart of figure W41, the rotation speed = O(r.

p m), the output voltage of mono multi//, /2 is 10E.
(V) If the SO power is configured to be a square wave, the output voltage of the booster 13 will be 0 (V), and the bias 15 will be unnecessary for the purpose. Low-pass filter/4C) It is not possible to obtain positive and negative DC voltages at the output.

In the reference figure, 30/~JOj are the output of the quadrature circuit 3, the output of the inverter, the output of the mono multi//, the output of the mono multi 12, and the output of the adder 13 when the rotation is stopped. This is the input waveform of the pass filter/shi.

307 is the output of the shaping circuit 3, the output of the mono multi//, the output of the mono multi 12, and the input waveform of the low-pass filter/4' in the normal rotation direction. 30! , 7.2, 30 is the output waveform in the reverse rotation direction, which is the same as in the forward rotation direction.

In the seventh and coupling embodiments, λ phase excitation windings Va, Vβ
Although the case of a resolver l having a J-phase excitation winding # or generally a multi-phase excitation winding ls\r is used, the speed can be detected in exactly the same way. FIG. 3 is a block diagram of a third embodiment of the invention.

The three-phase excitation winding #W,, 'W@, v, is excited by a resolver toss-phase sine wave generator ν, and the voltage B at the detection voltage = BB 5in (#t + 6.)
1 is a constant.

Figure 1 is a schematic detailed diagram of the first embodiment of the present invention.
The voltage Eゎ at ωt+08) is a constant.

In addition, the three-phase sine wave generator m or the polyphase sine wave generator λ00 shown in Fig. By b.
Easy to configure.

In addition, 2,1 of resolver l@ excitation winding V, , Vβ and relationship 1 with detection winding VD are replaced, detection unit 1IISt
PJ) In the case of J magnetism, the co-phase excitation winding IW (!# Y/ has an amplitude modulation signal CO@ corresponding to the rotation angle θ8 of the rotor.
ωt-coa#. and cosa+t-5in#, or induced (Fig. 1).

Using these amplitude modulation coefficients, sinω$ and eolωt, the phase modulation signal coo(伽z+#,)
By combining one signal, a speed detection circuit can be constructed in the same manner as in the previous embodiments (jth embodiment of the present invention).

According to the present invention, the following effects are recognized. When the speed detection sensitivity is the same as that of the conventional method, the low-pass filter 0 time constant 'Ik or less and -(, bc and i
Therefore, it is possible to completely improve the responsiveness of speed detection◎ ■ Also, if the responsiveness, i.e., g + / Since the speed detection sensitivity can be doubled, the influence of 011 degree drift caused by the amplifier (not shown) that forms one circuit can be halved, and the responsiveness of speed detection can be improved. For example, if the carrier frequency is /l series 1, resol no polarity t
If the fuco, resolver rotation speed is 1000 r, and m is included, then lf
z 400 Hz.

If carrier circumference JlI number ffKHM, detection sensitivity (Δ
f/f) is a fist i Tp, ADD Tl* //lKnw is 60
0 Ez/9 KHz. However, the higher the carrier frequency, the better the response.
In order to improve responsiveness even when the carrier frequency decreases,
In the present invention, the pulse frequency input to the low/< filter? By setting (@+■ in Figure 3 and the reference figures) to one time the carrier frequency ■, the time constant a1 of the low-pass filter can be made smaller, resulting in better response.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional device, FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention, FIG. 3 is a time chart showing its operation, and FIG. 5 is a block diagram of the J□ embodiment of the present invention, the 4th cape is a route map of the D embodiment of the present invention, and FIG. 7 is its polyphase diagram. Block diagram of a sine wave generator,
FIG. 1 is an explanatory diagram showing a partial circuit of the jc) embodiment of the present invention. /, 10.100--Resolver, λ, co & ta #
Koo. ...Sine wave generator, B...λ phase → polyphase switch, J
. Da... shaping circuit, t, a... f/ma converter, 7...
・Differential amplifier, I, /4...detection speed output terminal, de...inver J, //, /co...mono multi, /J
-・φ addition 11h, Hiroshi...4-pass filter,
/3...Bias (electronic EE). Applicant's agent Kiyoshi Inomata C03(i)
t -CO8ee CO3(JJt-5jTtθe

Claims (1)

[Scope of Claims] A resolver connected to a rotating shaft, a shaping circuit that converts a phase modulated signal phase-modulated by the rotation angle of the resolver into a square wave signal, and a shaping circuit that converts a phase modulated signal into a square wave signal at the time of rising of the square wave signal. a first monostable multivibrator that operates; a λ-th monostable multivibrator that operates at the rising edge of the inverted signal of the square wave signal; The output signal of this adder is equipped with an adder for adding the output signals of the monostable multi-biplane, and a low-pass filter converting the output signal of this adder into a DC voltage. A large rotational speed detection device using a resolver that detects the t-% sign.