User guide

14
Avago Technologies Motion Control Encoders in Electrical Motor Systems: Design Guide
dependent of the motor selected for the particular
application. Avago Technologies oers encoder systems
which match a wide range of motor shaft sizes.
5.4.1 Large shaft size
Encoders in the large shaft size category are suitable for shaft
sizes from 10mm or above, depending on the type of encoder
selected. Some of the encoders listed here can easily t larger
shaft sizes through the use of a larger OD codewheel.
5.4.2 Medium shaft size
Encoders in the medium shaft size category are suitable
for shaft sizes up to 8mm, depending on the type of
encoder selected. Some of the encoders listed here
can accommodate larger shaft sizes by using a larger
size codewheel.
5.4.3 Small shaft sizes
Encoders in the small shaft sizes category are suitable for
shaft sizes of 6mm and below. These encoders typically have
small form factors and used in space limited applications.
Some of the encoders listed here can accommodate larger
shaft sizes by using a larger codewheel.
5.5 Encoders for BL DC Motor System: By Motor Speed
Generally, an incremental encoder will have a maximum
electrical signal frequency at which it will operate.
The maximum rotational speed is determined by this
frequency. If the maximum speed is exceeded, the output
will become unreliable and inaccuracies will occur. Usage
of a high speed encoder for an application which only
requires much lower speed will not be cost eective.
Avago oers a wide range of rotation speeds to meet
the various types of speed requirements typically found
in applications. The encoders are classied into three
categories: below 3,000 revolutions per minute (rpm),
3,000 rpm to 6,000 rpm and those from 6,000 rpm
to 12,000 rpm.
It is important to note that the mechanical limit for the
encoders may be much higher than the electrical limit,
which typically is 12000 rpm or higher.
5.5.1 3,000 rpm and below
These solutions are specically designed in compact
form for an easier design-in to most applications, while
maintaining a low cost structure to assist customers.
Typical applications requiring low speed encoders include
oce automation and consumer products.
5.5.2 3,000 rpm to 6,000 rpm
Avago’s encoders ensure reliability and performance,
meeting or exceeding standard operating requirements
for feedback systems. It provides good price to
performance ratio and ensures an easy assembly process.
Typical applications that require these rotational
speeds include servo motor and drives, and various
other applications in the industrial and factory
automation process.
5.5.3 6,000 rpm to 12,000 rpm
Avago’s encoders ensure reliability and provide faster servo
response time with an improved dynamic performance.
The encoders are designed to cater to a variety of
dierent shaft and motor sizes, complete with a wide
range of resolutions and abilities to cater to compact
packaging requirements.
5.5 Selection Table: Encoders by Motor Speed
Speed
Size
< 20 20 to 40 40 to 60
< 3000
AEDR-8400
AEDR-850x
AEDR-83xx
AEDR-8400
AEDR-83xx
HEDS-97xx /90xx
HEDR-54xx
AEDB-9140
AEDR-8400
AEDR-83xx
HEDS-97xx /90xx
AEDB-9340
HEDS-974xx
HEDx-55xx /56xx
HEDB-9000
HEDx-90 /91xx
3000-6000
AEDR-83xx
AEDR-83xx
HEDS-97xx /90xx
HEDR-54xx
AEDB/T-9140
AEDR-83xx
HEDS-97xx /90xx
AEDB/T-9340
6000-12000
AEDx-8xxx
AEAT-6600-T16
AEDB-9140
HEDx-55xx /56xx
HEDB-9000
HEDx-90 /91xx
AEAT-7000
AEAT-9000