Delta RMC101 User Manual download pdf (Page 604)

100

101

RMC100 and RMCWin User Manual

6-60

Resolvers are rotary transformers with one primary winding and two secondary windings. The

primary winding is generally on the rotor and the two secondary windings are on the stator. The

secondary windings are arranged 90 degrees from each other such that when one is lined up with

the rotor winding (full coupling) the other is at a right angle (no coupling).

The primary winding is driven with an alternating current signal at a specified voltage and

frequency. The position measurement is determined by the ratio of the amplitudes of the signals

on the secondary windings and their phase with respect to the primary signal.

The RMC100 Resolver Interface Module

Resolvers are commercially available in many varieties with different specifications. The primary

specifications of interest as applied to the RMC are:

a. Frequency

The frequency of the signal driving the primary winding.

b. Voltage

The specified voltage of the signal driving the primary winding.

c. Output Voltage

The output voltage from the secondary windings or the transformation ratio between primary and

secondary windings.

The RMC resolver interface card is designed to work with only a subset of all resolver types

available. The Resolver Specifications topic lists the range of values compatible with the standard

RMC Resolver module. In addition, a wider range of resolvers can be used by modifying

components on the interface card module or by using external reference generators to drive the

primary winding. Contact Delta for more details.

Determining Absolute Position

There are several conditions when the resolver axis establishes its absolute position within one

turn of the resolver. These conditions are:

• On power-up

• After a transducer fault

• After a Reset Position command

• After a Set Parameters command if the Scale or Coordinate Limit parameters have changed

The axis determines its absolute position as follows.

1. The 16-bit value read from the resolver is added to the Count Offset

2. If the result is outside the range of -32768 to +32767 then 65536 is added or subtracted to force

it into the range. (This is the range that can be represented by a 16 bit number.)

3. This value is converted to Position Units:

Position Units = Scale x Counts / 32768

1 2 ... 599 600 601 602 603 604 605 606 607 608 609 ... 950 951

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Delta RMC101 User Manual Page 604

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