Vr = V
參數(shù)資料
型號: ADW71205WSTZ
廠商: Analog Devices Inc
文件頁數(shù): 19/20頁
文件大?。?/td> 0K
描述: IC ADC RDC 12BIT W/OSC 44-LQFP
標準包裝: 1
位數(shù): 12
數(shù)據(jù)接口: 串行,并聯(lián)
轉(zhuǎn)換器數(shù)目: 3
功率耗散(最大): 50mW
電壓電源: 單電源
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 44-LQFP
供應商設備封裝: 44-LQFP(10x10)
包裝: 托盤
輸入數(shù)目和類型: 1 個差分,單極
AD2S1205
Rev. A | Page 8 of 20
RESOLVER FORMAT SIGNALS
06
33
9-
0
03
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
633
9-
0
04
S2 – S4
(COSINE)
S3 – S1
(SINE)
R2 – R4
(REFERENCE)
90°
180°
θ
270°
360°
Figure 4. Electrical Resolver Representation
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