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AD2S1205 Datasheet(PDF) 8 Page - Analog Devices |
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AD2S1205 Datasheet(HTML) 8 Page - Analog Devices |
8 / 20 page AD2S1205 Rev. A | Page 8 of 20 RESOLVER FORMAT SIGNALS Vr = Vp × Sin(ωt) Vb = Vs × Sin(ωt) × Sin(θ) (A) CLASSICAL RESOLVER S1 S3 Va = Vs × Sin(ωt) × Cos(θ) S2 S4 R1 R2 θ Vr = Vp × Sin(ωt) Vb = Vs × Sin(ωt) × Sin(θ) (B) VARIABLE RELUCTANCE RESOLVER S1 S3 Va = Vs × Sin(ωt) × Cos(θ) S2 S4 R1 R2 θ Figure 3. Classical Resolver vs. Variable Reluctance Resolver A classical resolver is a rotating transformer that typically has a primary winding on the rotor and two secondary windings on the stator. A variable reluctance resolver, on the other hand, has the primary and secondary windings on the stator and no windings on the rotor, as shown in Figure 3; however, the saliency in this rotor design provides the sinusoidal variation in the secondary coupling with the angular position. For both designs, the resolver output voltages (S3 − S1, S2 − S4) are as follows: Sinθ t Sin E S1 S3 0 × ω = − ) ( (1) Cosθ t Sin E S4 S2 0 × ω = − ) ( where: θ is the shaft angle. Sin(ωt) is the rotor excitation frequency. E0 is the rotor excitation amplitude. The stator windings are displaced mechanically by 90° (see Figure 3). The primary winding is excited with an ac reference. The amplitude of subsequent coupling onto the secondary windings is a function of the position of the rotor (shaft) relative to the stator. The resolver therefore produces two output voltages (S3 − S1, S2 − S4), modulated by the sine and cosine of the shaft angle. Resolver format signals refer to the signals derived from the output of a resolver, as shown in Equation 1. Figure 4 illustrates the output format. 0° S2 – S4 (COSINE) S3 – S1 (SINE) R2 – R4 (REFERENCE) 90° 180° θ 270° 360° Figure 4. Electrical Resolver Representation |
Similar Part No. - AD2S1205_15 |
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Similar Description - AD2S1205_15 |
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