Siemens SLI-5310 Instrucciones de operaciones descargar pdf (Pagina 39)

General information

Aligning the rotary encoders to the motor EMF

Synchronous motors require information

on the rotor position immediately after

switch-on. This information can be provided

by rotary encoders with additional

commutation signals, which provide

relatively rough position information. Also

suitable are absolute rotary encoders in

multiturn and singleturn versions, which

transmit the exact position information

within a few angular seconds (see also

Electronic commutation with position

encoders). When these encoders are

mounted, the rotor positions of the

encoder must be assigned to those of the

motor in order to ensure the most constant

possible motor current. Inadequate

assignment to the motor EMF will cause

loud motor noises and high power loss.

Rotary encoders with integral bearing

First, the rotor of the motor is brought to a

preferred position by the application of a

DC current. Rotary encoders with com-

mutation signals are aligned approximate-

ly—for example with the aid of the line

markers on the encoder or the reference

mark signal—and mounted on the motor

shaft. The ﬁ ne adjustment is quite easy

with a PWM 9 phase angle measuring de-

vice (see HEIDENHAIN Measuring and

Testing Devices): the stator of the encoder

is turned until the PWM 9 displays, for ex-

ample, the value zero as the distance from

the reference mark. Absolute rotary en-

coders are at ﬁ rst mounted as a complete

unit. Then the preferred position of the mo-

tor is assigned the value zero. The adjusting

and testing package (see HEIDENHAIN

Measuring and Testing Devices) serve this

purpose. They feature the complete range

of EnDat functions and make it possible to

shift datums, set write protection against

unintentional changes in saved values, and

use further inspection functions.

Rotary encoders without integral

bearing

ECI/EQI rotary encoders are mounted as

complete units and then adjusted with the

aid of the adjusting and testing package.

For the ECI/EQI with pure serial operation,

electronic compensation is also possible:

the ascertained compensation value can be

saved in the encoder and read out by the

control electronics to calculate the position

value. ECI/EQI 1300 also permit manual

alignment. The central screw is loosened

again and the encoder rotor is turned with

the mounting aid to the desired position

until, for example, an absolute value of

approximately zero appears in the position

data.

Motor current of adjusted and very poorly adjusted rotary encoder

Aligning the rotary encoder to the motor EMF with the aid of the adjusting

and testing software

Manual alignment of ECI/EQI 1300

Encoder aligned

Encoder very poorly aligned

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Siemens SLI-5310 Instrucciones de operaciones Pagina 39

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