Question

什么是磁栅编码器?

Answer 1

磁栅式传感器（ magnetic grating transducer ）利用磁栅与磁头的磁作用进行测量的位移传感器。它是一种新型的数字式传感器，成本较低且便于安装和使用。精度较高,可达±0.01毫米／米，分辨率为1～5微米。
可有直线，角度编码器（传感器）
原理类此磁带录音，录上等距磁信号，由磁头读出，广泛用于机床等的位置测量。

Answer 2

Measuring standard
HEIDENHAIN encoders incorporate
measuring standards of periodic structures
known as graduations.
Magnetic encoders use a graduation carrier
of magnetizable steel alloy. A write head
applies strong local magnetic fi elds in
different directions, so that a graduation
consisting of north poles and south poles is
formed with a signal period of 400 μm
(MAGNODUR process). Due to the short
distance of effect of electromagnetic
interaction, and the very narrow scanning
gaps required, fi ner magnetic graduations
are not practical.
Magnetoresistive scanning principle
Measuring standard
Scanning
reticle
Magnetoresistive sensors for B+ and B– not shown
Magnetic scanning
The permanently magnetic MAGNODUR
graduation is scanned by magnetoresistive
sensors, whose resistances change in
response to a magnetic fi eld. When a
voltage is applied to the sensor and the
scale drum moves relative to the scanning
head, the fl owing current is modulated
according to the magnetic fi eld.
The special geometric arrangement of the
resistive sensors and the manufacture of
the sensors on glass substrates ensure a
high signal quality. In addition, the large
scanning surface allows the signals to be
fi ltered for harmonic waves. These are
prerequisites for minimizing position errors
within one signal period.
A structure on a separate track produces a
reference mark signal. This makes it
possible to assign this absolute position
value to exactly one measuring step.
Magnetoresistive scanning is used primarily
for comparatively low-accuracy applications,
or for applications where the machined
parts are relatively small compared to the
scale drum.
Incremental measuring method
With the incremental measuring method,
the graduation consists of a periodic
grating structure. The position information
is obtained by counting the individual
increments (measuring steps) from some
point of origin. The shaft speed is
determined through mathematic derivation
of the change in position over time.
Since an absolute reference is required to
ascertain positions, the scale drums are
provided with an additional track that bears
a reference mark. The absolute position on
the scale, established by the reference
mark, is gated with exactly one measuring
step. The reference mark must therefore
be scanned to establish an absolute
reference or to fi nd the last selected
datum.

Answer 3

是在园型磁铁表面充了多个S,N极，配合检测元件（霍尔）组成的。

Answer 4

阿是磁编码器啊？