JP3343466B2 - Rotary differential transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type differential transformer, and more particularly, to a rotary type differential transformer having an output voltage characteristic of ± 90.
It relates to a new improvement to be linear over time.

[0002]

2. Description of the Related Art Conventionally, as a rotary differential transformer of this kind used, for example, a configuration as shown in FIG. 9 has been adopted. That is, in FIG. 9, the reference numeral 1 indicates that the entire shape is formed in a ring shape, and the reference numerals 2, 3, 4,
The stator has a four-pole configuration indicated by reference numeral 5, and four slots denoted by reference signs A, B, C, and D are formed by the four poles. As shown in FIG. 10, the exciting winding 10 is wound around the first pole 2 and the third pole 4 which are arranged opposite to each other, and
1 is wound around the fourth pole 5 and the second pole 3 which are arranged opposite to each other. A rotor 13 is rotatably provided inside the stator 1 via a rotating shaft 12.
The large diameter portion 13a and the small diameter portion 13b are formed in a semicircular (180 °) shape. Accordingly, the rotor 13 is configured such that the gap permeance with the stator 1 is proportional to the rotation angle θ, and the output voltage V _OUT when the rotor 13 rotates is −180 ° as shown in FIG. In the angle range from 0 ° to + 180 °, the changing portion was a linear range from −45 ° to + 45 °.

[0003]

Since the conventional rotary type differential transformer is configured as described above, there are the following problems. That is, in the winding structure shown in FIG. 9 and FIG. 10, as shown in FIG.
Since the output voltage is saturated in a range deviating from 45 ° (or 180 ° + or −45 °), it is impossible to detect an angle that needs to be detected beyond this angle range. Therefore, when an angle detection of 45 ° or more is required, the rotation of the rotating shaft must be reduced by using a gear, and the cost is increased by using the gear, or the sensitivity is reduced by the reduction structure. There was a problem such as deterioration of the product.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and more particularly, to provide a rotary type differential transformer whose output voltage characteristic is linear over ± 90 °. With the goal.

[0005]

A rotary differential transformer according to the present invention has an exciting winding and an output winding provided on a stator, and a gap permeance with the stator is rotated inside the stator. In a rotary differential transformer having a rotor shaped in proportion to the angle θ, the exciting winding has 4 × n poles (n = positive number) , and the rotor is
Satisfies the conditions of the following expression is a gap [delta] _theta between over data and the rotor
It is a configuration to do.

(Equation 4)

A rotary differential transformer according to another embodiment of the present invention.
Has an excitation winding and an output winding provided on the stator.
And a gap between the stator and the inside of the stator.
A row with a shape whose permeance is proportional to the rotation angle θ
In the rotary differential transformer having the excitation winding,
4 × n poles (n = positive number), wherein the rotor is a stator
And rotor gap δ _θ satisfies the condition given by
Configuration .

(Equation 5)

[0007] Further , it has n poles and has the same radius.
Excitation winding and output winding provided on the stator
And a gap between the stator and the outside of the stator.
Outer shape with permeance proportional to rotation angle θ
In a rotary type differential transformer having a rotor,
The winding has a configuration of 4 × n poles (n = positive number).

Further, the outer rotor is provided with a stator.
Structure the gap [delta] _theta between rotor satisfies the conditions of the following formula
It is good.

(Equation 6)

In the rotary differential transformer according to the present invention, the excitation winding is applied to each pole of the stator, and the rotor has a substantially circular shape with one valley.
When this rotor is rotated, the output voltage changes from -90 ° to +
At 90 °, the range becomes a straight line, and angle detection in the conventional angle range of 45 ° or more can be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the rotary differential transformer according to the present invention will be described below in detail with reference to the drawings. The same or equivalent parts as those in the conventional example will be described using the same reference numerals. In FIG. 1, a stator denoted by reference numeral 1 is a stator having an overall shape formed in a ring shape and having a four-pole configuration denoted by reference numerals 2, 3, 4, and 5. The four slots shown are formed. As shown in FIG. 2, the excitation winding 10
The output winding 11 is wound in a state of being connected in series to the pole 5, and the first and second poles 4 and 4 are arranged opposite to each other.
It is wound around. Therefore, the exciting winding 10 is provided with 4 × n poles (n is a positive number), and the output winding 11 is provided with 2 × n poles (n
Are positive numbers).

A rotor 13 is rotatably provided on the inner side of the stator 1 via a rotary shaft 12. The rotor 13 has a substantially circular shape having one valley 20 on its outer periphery (FIG. 7). Shown). Further, as another embodiment, as shown in FIG. 4, the rotor 13 can be configured to have a pair of valleys 30a formed to face the outer periphery thereof. In the shape of the rotor 13 shown in FIG.
As shown in FIG. 3, the characteristic of the output voltage V _OUT from the output winding 11 has a linear range from + 90 ° to −90 °. Further, in the case of the shape of the rotor 13 shown in FIG. 4, the number of poles of the stator 1 is also n = 2.
The characteristics of the output voltage V _OUT of No. 1 are in the same range as in the related art as shown in FIG. 5, but the linearity can be improved.

Next, a description will be given of the results of a rotor shape calculation study in which the shape of the rotor 13 shown in FIG. 1 is specified.
First, in FIGS. 7 and 8, assuming that the permeance of the gap is Pg (θ), Pg (θ) = P ₀₀ + P ₀₁ ·
θ: The structure changes according to the expression (1). Here, assuming a gap length δθ at an arbitrary position θ of the rotor 13, the permeance is equal to the equation (1), and Bg = μ ₀ / δ
θ (δθ = μ ₀ / Bg), δθ = μ ₀ / P ₀₀
+ P ₀₁ · θ Expression (2), when θ = 0, δ ₀ = μ ₀
/ P ₀₀ , P ₀₀ = μ ₀ / δ ₀ (3)
When = π / 2, the gap between the stator 1 and the rotor 13 is the minimum gap, and the following equations (4) and (5) are obtained.

[0013]

(Equation 7)

[0014]

(Equation 8)

(Equation 9) Therefore, when the inner diameter of the stator 1 (radius) and gamma _1, the distance between the outer periphery and the center of the rotor 13 at an angle theta gamma (theta)
Is the following equation (7)

[0015]

(Equation 10) Becomes

In the configuration shown in FIG. 4, since n = 2, the number of status lots = 4 × n slots, and the rotor shape is expressed by the following equation (8).

[0017]

[Equation 11] Becomes

In the case of the outer rotor type shown in FIG.
The stator 1 having the same outer periphery radius is formed in an inner shape, and one trough 20 is formed on the inner periphery of the ring-shaped outer rotor 13A.
Is rotated, it is possible to obtain the same output characteristics as in FIG. The configuration of the outer rotor 13A in the configuration of FIG. 6 is a configuration that satisfies Expression (5) of Equation 1. 6, the inner diameter (radius) of the stator 1 is shown.
Is γ ₁ , the distance γ (θ) between the outer periphery and the center of the rotor 13 at the angle θ is given by the following equation (9).

[0019]

(Equation 12) Becomes

[0020]

The rotary type differential transformer according to the present invention is constructed as described above, so that a wide linearity from + 90 ° to −90 ° can be obtained, and a low cost and sensitive angle. Detection can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a rotary differential transformer according to the present invention.

FIG. 2 is a connection diagram of the windings of FIG. 1;

FIG. 3 is a characteristic diagram of the output voltage of FIG. 1;

FIG. 4 is a configuration diagram showing another embodiment of FIG. 1;

FIG. 5 is a characteristic diagram of the output voltage of FIG. 4;

FIG. 6 is a configuration diagram showing another embodiment of FIG. 1;

FIG. 7 is a configuration diagram illustrating gap permeance of the rotor of FIG. 1;

FIG. 8 is a characteristic diagram showing a permeance change in FIG. 7;

FIG. 9 is a configuration diagram showing a conventional configuration.

FIG. 10 is a connection diagram of FIG. 9;

FIG. 11 is a characteristic diagram of the output voltage of FIG. 9;

[Explanation of symbols]

 Reference Signs List 1 stator 10 exciting winding 11 output winding 13 rotor 20 valley 30a, 30b valley 13A outer rotor

Claims (4)

(57) [Claims] An exciting winding (10) provided on a stator (1)
And an output winding (11), inside the stator (1),
In a rotary differential transformer having a rotor (13) shaped such that the gap permeance with the stator (1) is proportional to the rotation angle θ, the exciting winding (10) has 4 × n poles (n =
The rotor (13) is fixed to the stator (1)
Motor (13) satisfying the gap [delta] _theta is the condition by the following equation between child
And a rotary differential transformer. (Equation 1) 2. An exciting winding (10) provided on a stator (1).
And an output winding (11), inside the stator (1),
The gap permeance with the stator (1) is the rotation angle
Rotary difference with rotor (13) shaped to be proportional to θ
In the dynamic transformer, the exciting winding (10) has 4 × n poles (n =
The rotor (13) is fixed to the stator (1)
Motor (13) satisfying the gap [delta] _theta is the condition by the following equation between child
And a rotary differential transformer . (Equation 2) 3. An n-pole having the same radius.
The excitation winding (10) and the output winding (1) provided on the stator (1)
1), outside the stator (1), the stator (1)
So that the gap permeance with is proportional to the rotation angle θ
Rotary Differential Transformer with Outer Rotor (13A) of Various Shapes
In the above, the excitation winding (10) has 4 × n poles (n = positive number).
A rotary differential transformer, characterized in that: 4. The outer rotor (13A) includes a stator (1).
Satisfy the conditions by the following equation as a gap [delta] _theta between rotor (13)
4. The rotary differential transformer according to claim 3, wherein
vessel. (Equation 3)