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AD2S1205YSTZ Datasheet(PDF) 8 Page - Analog Devices |
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AD2S1205YSTZ Datasheet(HTML) 8 Page - Analog Devices |
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8 / 25 page  AD2S1205 Preliminary Technical Data Rev.PrB | Page 8 of 25 RESOLVER FORMAT SIGNALS Vr = Vp × Sin(ϖt) Vb = Vs × Sin(ϖt) × Sin(θ) (A) CLASSICAL RESOLVER S1 S3 Va = Vs × Sin(ϖt) × Cos(θ) S2 S4 R1 R2 θ Vr = Vp × Sin(ϖt) Vb = Vs × Sin(ϖt) × Sin(θ) (B) VARIABLE RELUCTANCE RESOLVER S1 S3 Va = Vs × Sin(ϖt) × Cos(θ) S2 S4 R1 R2 θ Figure 3. Classical Resolver vs. Variable Reluctance Resolver A resolver is a rotating transformer typically with a primary winding on the rotor and two secondary windings on the stator. In the case of a variable reluctance resolver, there are no wind- ings on the rotor as shown in Figure 3. The primary winding is on the stator as well as the secondary windings, but the saliency in the rotor design provides the sinusoidal variation in the secondary coupling with the angular position. Either way, the resolver output voltages (S3–S1, S2–S4) will have the same equations as shown in Equation 1. Amplitude Excitation Rotor E Frequency Excitation Rotor t Sin Angle Shaft Cos t Sin E S S Sin t Sin E S S = = = × = − × = − 0 0 0 4 2 1 3 ω θ θ ω θ ω Equation 1. 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 stator secon- dary 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 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 TO S4 (Cos) S3 TO S1 (Sin) R2 TO R4 (REF) 90° 180° θ 270° 360° Figure 4. Electrical Resolver Representation |
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