DS2100 User's Manual SECTION 5: DS2100 FUNCTIONAL OVERVIEW
PAGE 5-18
5.5 Resolver Input
The resolver input allows the connection of various resolvers for drive position feedback, velocity feedback or for
motor commutation (rotor angle feedback).
The drive supplies the resolver with a sinusoidal reference signal (R1 - R2). The resolver output signals have the
same frequency as the reference but the amplitude changes depending on the rotational angle. The output signals
are normally referred to as Sine (S1 - S3) and Cosine (S2 - S4). By measuring the amplitude of both Sine and
Cosine Signals and applying an arctan function the drive can determine the rotor angle of the motor.
0
0 360
o
Resolver
S1 - S3
Amplitude
(Sine)
Resolver
S2 - S4
Amplitude
(Cosine)
Resolver
Angle
0
Resolver
R1 - R2
Supply
Amplitude
Resolver
Angle
Resolver
Angle
Figure 5.2: Resolver Signal Amplitude
The picture shows the amplitude of the Sine and Cosine signals depending on the rotation angle of the resolver.
Normally the reference voltage is about 4 Volts and the maximum Sine or Cosine voltage is about 2 Volts. The
frequency is 5 kHz.
5.5.1 Resolver Configuration
5.5.1.1 Number Resolver poles
The number of resolver pole pairs determines the number of full Sine or Cosine amplitude cycles per full
mechanical revolution. In order to function properly, the parameter resolver_poles
(index 0x2171, subindex 3) has
to be set to the number of resolver poles (pole pairs multiplied by 2). Refer to the motor manufacturers datasheet
for further information. For standard motors in the motor database this parameter is configured as part of the motor
parameter download.
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