ABSOCODER (Rotary Position Sensor) , Cảm biến vị trí Quay VRE-P062SAC - NSD Vietnam

Principle of ABSOCODER (Rotary Position Sensor)

Single-turn type ABSOCODER

"The principle is based on this single-turn type ABSOCODER.
As shown in the ABSOCODER operating principle diagram, a coil of wire is wound around each of the four stator poles, to which ""a sin ωt"" and ""a cos ωt"" inputs are supplied. When the rotor, eccentric to the stator poles, is turned θ degrees, a four-pole-aggregate output of ""k sin (ωt-θ)"" will be induced, and the rotation degree θ can be calculated from the ""a sin ωt"" input and the ""k sin (ωt-θ)"" output. The calculated θ will be output as an absolute value. "

Fig.1 ABSOCODER Operating Principles

Structure of single-turn type VRE

Multi-turn type ABSOCODER

This unit actually contains two separate single-turn type sensors which are described above:VRE1 and VRE2, connected to each other to the "n to n-1" gear ratio. Through the whole range up to n-th turn, there is only one point where the two sensors can be coincident. With this, the difference of degrees between VRE1 and VRE2 will indicate the number of rotations the unit has actually turned, providing an all-range absolute position detection. (See Figures 2 and 2-2.)

Fig.2 Multi-turn type MRE-32SP□ (32-turn type sensor)

Fig.2-2 Multi-turn type MRE-G type (64 ～ 2560-turn type sensor)

Principle of ABSOCODER (Linear Position Sensor)

Linear-type ABSOCODER (single-rod),CYLNUC
Inrodsensor

The basis of the linear-type ABSOCODER (VLS) principle is the same as the single-type ABSOCODER (VRE). The length uivalent to one- rotation of VRE is the same as the length of one-pitch of VLS. As shown in the rod sensor operating principle diagram, the rod comprises a series of magnetic and non-magnetic materials arranged in a straight line and alternating at an identical pitch. Primary and secondary coils are wound concentrically to this rod, with "a sin ωt" and "a cos ωt" inputs supplied to the primary coil.

When the rod has moved distance X within a single pitch length, "k sin (ωt-2πx/p)" will be induced in the secondary coil. With this, the value of X, or displacement within a single-pitch length, can be calculated from the "a sin ωt" input and the "k sin (ωt-2πx/p )" output to be output as an absolute value. (The structures of sensors are different, but the principle of Inrodsensor is same as the linear type of sensor. See Figure 4.)

The position of the rod length is output by counting pitches at a converter or controller when the travel length is more than one-pitch. The semi-absolute is a method that the converter counts pitches and outputs the value.

Fig.3 Linear-type ABSOCODER (VLS) Operation Principle Diagram

Fig.4 Inrodsensor Operating Principle

Linear-type ABSOCODER (dual-rod)

When the same length rods, "P1-pitch X n" and "P2-pitch X (n-1)" are paired, all-range absolute position can be detected by the difference between L1(the current position value of "P1-pitch X n" rod) and L2(the current position value of P2-pitch X (n-1)rod". (See Figure 5.)

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