6200-20-0977 Mindray PM7000 Patient Monitor Encoder Knob
The role of the encoder
1.Introduction
An encoder is a hardware/software device that converts an analog
video signal (such as a bit stream) or data into a digital signal
that can be used for communication, transmission and storage.
Encoders are widely used. They are mainly used to detect the speed,
position, angle, distance or count of mechanical motion. In
addition to being used in machinery, many motor controls such as
servo motors need to be equipped with encoders for motor
controllers as commutation , speed and position detection.
2. Classification
1. Classified according to different working principles (1)
Incremental type: It sends out a pulse signal every time the angle
of the unit is turned
(there is also a sine and cosine signal, and then subdivides it,
chopping out a pulse with a higher frequency) , usually A-phase,
B-phase, Z-phase
output, A-phase, B-phase is the pulse output of mutual delay 1/4
cycle, according to the delay relationship can distinguish positive
and negative,
and by taking the rise and fall of A-phase, B-phase The frequency
can be multiplied by 2 or 4 along the edge; the Z phase is a
single-turn pulse,
that is, a pulse is sent out per circle. (2) Absolute value type:
corresponding to one circle, each reference angle emits a unique
binary value
corresponding to the angle, and multiple positions can be recorded
and measured through an external circle recording device. 2.
According to
different readout methods, it can be divided into: contact type and
non-contact type. 3. According to the output type of the signal, it
is divided into:
voltage output, open collector output, push-pull complementary
output and long-line drive output. 4. Classified by encoder
mechanical installation
form (1) Shaft type: shaft type can be divided into clamping flange
type, synchronous flange type and servo installation type, etc. (2)
Shaft sleeve
type: The shaft sleeve type can be divided into half hollow type,
full hollow type and large diameter type. 5. According to the
working principle of
the encoder, it can be divided into: photoelectric type,
magnetoelectric type and contact brush type.
| Product Name | Mindray PM7000 Patient Monitor Encoder Knob 6200-20-0977
|
| Brand | Mindray |
| Part No | 6200-20-0977
|
| Use for | Mindray PM7000 Patient Monitor |
| MOQ | One piece |
What are the functions of the encoder?
Encoder is a kind of sensor (Sensor), which is mainly used to
detect the speed, position, angle, distance or count of mechanical
movement. In
addition to being used in industrial machinery, many motor control
servo motors and BLDC servo motors are An encoder is required for
the motor
controller to detect phase commutation, speed, and position, so it
has a wide range of applications. According to the detection
principle, the
encoder can be divided into optical, magnetic, inductive and
capacitive. According to its scale method and signal output form,
it can be divided
into incremental encoder and absolute encoder. Photoelectric
encoders use the principle of grating diffraction to realize
displacement-to-digital
conversion. They have been used in machine tools and computing
instruments since the 1950s. Because of their simple structure,
high
measurement accuracy, and long life, they have been valued and
promoted at home and abroad. Positioning, speed, length,
acceleration,
vibration, etc. have been widely used. Contact encoder—Using brush
output, a brush contacts a conductive area or an insulating area to
indicate
whether the state of the code is "1" or "0". Non-contact
encoder——The receiving sensitive element is a photosensitive
element or a magnetic
sensitive element. When a photosensitive element is used, the
light-transmitting area and the opaque area are used to indicate
whether the state
of the code is "1" or "0". Incremental encoder—converts the
displacement into a periodic electrical signal, and then converts
the electrical signal
into counting pulses, and uses the number of pulses to represent
the magnitude of the displacement. When the rotating shaft rotates,
there is a
corresponding pulse output, and the counting starting point can be
set arbitrarily, which can realize multi-turn infinite accumulation
and
measurement. Absolute encoder - a sensor that directly outputs
digital quantities, often used in motor positioning or speed
measurement
systems. Because each angular position corresponds to a unique
digital code, its indication value is only related to the start and
end positions of
the measurement, but has nothing to do with the middle process of
the measurement. Rotary Incremental Encoder——Output pulses when
rotating, and know its position through the counting device. When
the encoder does not move or is powered off, it relies on the
internal memory of
the counting device to remember the position. Multi-turn absolute
encoder——Using the principle of clock and watch gear machinery,
when the
central code disc rotates, another set of code discs (or multiple
sets of gears, multiple sets of code discs) are driven through the
gears, and then
on the basis of single-turn encoding Increase the coding of the
number of turns to expand the measuring range of the encoder, and
the coding is
determined by the mechanical position. The coding of each position
is unique and does not need to be memorized.
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