Rotary Modulated Wave Resolver

Abstract

To provide a rotary modulated wave resolver significantly improving detection accuracy of a displacement amount of a turning angle, etc., by suppressing third and fifth harmonics included in a detection signal.SOLUTION: A rotary modulated wave resolver comprises a detection coil having a coil pattern including S types of segments with different arrangement relations of Δλ: when S is the number of types of segments and λ is a coil pattern pitch, including a reference segment having an arrangement of Δλ=0, and S-1 types of segments respectively displaced in a rotational direction of S-1 types of different Δλ rotational axes excluding Δλ=0 with respect to the reference segment. The S types of Δλ are determined by the following expressions: Δλ=λ×[a / 3×n+b / 5×n'], where S=n×n', λ is a basic pitch of the coil pattern, n and n' are integers of 2 or more, (a) is an integer of 0 or more and n-1 or less (0≤a≤n-1), b is an integer of 0 or more, and n'-1 or less (0≤b≤n'-1).SELECTED DRAWING: Figure 7

Claims

1. A rotary modulated wave resolver having an excitation coil or a detection coil having a coil pattern having S types of segments having different Δλ arrangement relationships, where S is the number of different types of segments in the coil pattern and λ is the pitch of the basic shape pattern of the coil pattern, and S-1 different types of segments are arranged in the rotational direction of the rotational axis, excluding Δλ = 0. A rotating modulated wave resolver characterized in that the S types of Δλ (including Δλ = 0 with respect to the reference segment) for S types of segments having the aforementioned different Δλ arrangement relationships are determined by the following formula 1. Δλ=λ×[a / 3×n + b / 5×n'] (Formula 1) During the ceremony λ: Pitch of the basic coil pattern shape n, n': Two or more integers satisfying S = n × n'. a: an integer between 0 and n-1 (0 ≤ a ≤ n-1) b: an integer between 0 and n'-1 (0 ≤ b ≤ n'-1)

2. The rotary modulated wave resolver according to claim 1, characterized in that the coil pattern having S types of segments having different Δλ arrangement relationships forms a coil pattern of S rows of segments, and each row of coil patterns is formed by a coil substrate in which the segments are arranged offset in the rotational direction of the rotation axis by S types different Δλ.

3. The rotary modulated wave resolver according to claim 1, characterized in that the coil pattern having S types of segments having different Δλ arrangement relationships is formed by a coil substrate having a coil pattern having segments of a shape formed such that the segments are divided into S equally spaced regions in the height direction, and the positions of the patterns in each region are shifted in the rotation direction of the rotation axis by S different Δλ.

4. The rotary modulated wave resolver according to claim 3, characterized in that, by connecting points obtained by dividing the patterns of each region in a predetermined ratio, the positions of the patterns in each region of the segment are formed in such a way that they are shifted in the rotational direction of the rotation axis of the S different types of rotation axes by Δλ.

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