JPH09265504A - Resolver / Digital signal output method - Google Patents

Abstract

(57) [Abstract] [Problem] The conventional resolver / digital signal conversion method is
Since the angle data was output only when the sampling pulse was input, it was impossible to obtain the angle data between each sampling pulse. A resolver / digital signal conversion method according to the present invention inputs a request signal at an arbitrary time between each sampling pulse and estimates its error .theta. This is a method that can output the angle θ _T.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resolver / digital signal output method, and more particularly to a novel improvement for outputting a true resolver angle without error even when a request signal asynchronous with a sampling pulse is input. Regarding

[0002]

2. Description of the Related Art As a conventional resolver / digital signal output method such as a phase method of this type, a sampling pulse is input at each timing of the frequency of an AC voltage for exciting the resolver to convert the resolver / digital data. I was trying to update.

[0003]

Since the conventional resolver / digital signal output method is configured as described above, the following problems exist. That is, even if a request signal is input at an arbitrary time asynchronous with the sampling pulse to extract the true resolver angle, a difference error occurs between the resolver angle and the resolver angle output for each sampling pulse. When rotating at, the error was large.

The present invention has been made to solve the above problems, and in particular, a resolver capable of outputting a true resolver angle without error even when a request signal asynchronous with a sampling pulse is input. / An object of the present invention is to provide a digital signal output method.

[0005]

SUMMARY OF THE INVENTION A resolver according to the present invention
The digital signal output method is a resolver / digital signal output method in which a resolver output signal from a resolver is converted into resolver / digital output data by a resolver / digital conversion unit, and the resolver / digital data is updated at every sampling pulse. In this method, the true resolver angle at the time of inputting the request signal in real time when the request signal is input asynchronously with the sampling pulse is estimated by the following equation (1).

[0006]

[Equation 2]

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a resolver / digital signal output method according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing a resolver / digital signal output method according to the present invention, and FIG. 2 is a waveform diagram. 1 is a well-known resolver, and the resolver output signal 1a shown in FIG. 2 from this resolver 1 is input to a well-known resolver / digital converter 2, and this resolver 1 is shown in FIG. The well-known resolver excitation signal 1b is applied.

The resolver / digital output data D' _{1 to} D' ₄ output from the resolver / digital converter 2 are updated by a sampling pulse 8 which will be described later, and are input to the first latch unit 4 to The true resolver angle θ _n when the first sampling pulse is input from the 1-latch unit 4 is input to the interpolation calculation unit 5 and simultaneously to the second latch unit 6. The true resolver angle θ _n-1 at the time of inputting the second sampling pulse from the second latch unit 6 is subtracted by the subtraction 7 together with the true resolver angle θ _n at the time of inputting the first sampling pulse. It is input to the interpolation calculation unit 5 as a true resolver angle difference Δθ _n . The true resolver angle 3 of FIG. 2 is formed by the above θ _n-1 , θ _n .

The timing pulse 8 from the resolver / digital converter 2 is supplied to the first, second and third latch units 4, 6, 6.
9 and the delay unit 10, the delay signal 10a from the delay unit 10 is input to the counter 12 to which the clock signal 11 from the resolver / digital conversion unit 2 is input, and the count data 12a from the counter 12 is 3, the fourth latch unit 9 and 13 are input, and the request signal 14 which is a data transmission command is input to the fourth latch unit 13 (which may be the interpolation calculation unit 5). Between each sampling pulse obtained from the third latch unit 9 (for example, t
The interval time Δt _{n-1 (} between _n-1 and t _n ), the sampling pulse t _n (t _n-1 or t _{n + 1,} etc.) obtained from the fourth latch section 13 and the request signal 14 The interval time T between and is input to the interpolation calculation unit 5.

In the above-mentioned structure, when the resolver 1 is excited and rotationally driven, the resolver output signal 1
a is output, count values D _{1 to} D ₄ corresponding to the angle of the resolver 1 are obtained by a counter (not shown) in the known resolver / digital conversion unit 2, and the count values D ₁ to
Based on D ₄ , R / D (resolver / digital) output data D ′ _{1 to} D ′ ₄ are obtained. The true resolver angle 3 is output by updating the data by the sampling pulse 8 according to the resolver angle θ of the resolver 1. The true resolver angle 3 is t of the sampling pulse 8.
_{where n−1} , t _n , t _{n + 1} , t _{n + 2} and t _{n + 3} ...
_n-1 , θ _n , θ _{n + 1} , θ _{n + 2} ...

Next, the request signal 14 is asynchronous with the sampling pulse 8 and the interpolation calculation section 5 or the fourth latch section 13
To the true resolver angle 3 at this time (that is, the true resolver angle θ _T when the request signal of the resolver 1 is input) and the true resolver angle 3 when the previous sampling pulse t _n is input (that is, Since an error of θ to = θ _T −θ _n occurs between the resolver 1 and the true resolver angle θ _n ), the true resolver angle θ _T at the time of inputting a request signal is interpolated by the following equation (1). Calculation is performed by the calculation unit 5.

[0012]

(Equation 3)

[0013] as a truly resolver angle 3 corrects errors θ~ in FIG 2 by the operation described above, it is possible to output the estimated true resolver angle theta _T the real time of the request signal input.

[0014]

Since the resolver / digital signal output method according to the present invention is configured as described above, the true resolver can be input at an arbitrary time irrespective of the cycle of each sampling pulse or can be highly accurate even by a request signal. The angle can be output, and the resolver / digital conversion output according to new needs can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a resolver / digital signal output method according to the present invention.

FIG. 2 is an operation waveform diagram of FIG.

[Explanation of symbols]

1 Resolver 1a Resolver output signal D' _{1 to} D' ₄ Resolver / digital data 8 Sampling pulse 14 Request signal θ _{T When} request signal is input True resolver angle

Claims (1)

[Claims] 1. A resolver output signal (1) from the resolver (1).
resolver / resolver / digital converter (2)
Convert it to digital data (D ′ _{1 to} D ′ ₄ ) and use this resolver /
Digital output data (D ′ _{1 to} D ′ ₄ ) is sampling pulse
In the resolver / digital signal output method in which the request signal (14) is input asynchronously with the sampling pulse (12a), the true resolver angle (θ _T Resolver / digital signal output method in which) is estimated by the following formula. [Equation 1]