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RESOLVER EQUIPPED MOTORS
The resolver supplied with POW ERTEC motors is a
frameless, single speed, transmitter type, mounted on the back of
the motor. The rotor element is mounted on the shaft.
See the table at the right for resolver specifications.
Resolver Wiring Configuration
R1
Excitation
Winding
(Primary )
R2
Positive resolver rotation is CW facing the resolver end of the motor.
The resolver puts out two sinusoidal waves which are in
quadrature, i.e., 90° out of phase with each other. The leading
wave is called the SIN output (S1 and S3) and the trailing wave
is called the COS output (S2 and S4).
There is one electrical cycle of each signal for each revolution of
the motor. The difference between the two waves reveals the
position of the motor. By looking at the period of the waveforms,
the drive can determine the speed of the motor. And by looking
at which waveform is leading, the drive knows in which direction
the motor is turning.
Phasing Voltage for 8 Pole Motor
for clockwise rotation at drive end
V
T1-T2
V
T2-T3
V
T3-T1
1 Mechanical Revolution
Resolver Output
S1-S3
(SINE)
S2-S4
(COSINE)
© copy right 2012 by P O WE R TEC Industrial Motors, Inc
POW ERTEC "F" Series Motor Manual
+
S1
Sine
Output
(Secondary )
S3
Cosine
Output
(Secondary )
S4
S2
Primary Feedback Devices - - Technical
Data
Frameless Resolvers
typical output @ 25°C
Parameter
Units
Frame Size
Ty pe
Primary
Speeds
Input Voltage
Vrms
Frequency
kHz
Input Current, max
mA
Input Pow er, nom
mW
Transformation
Ratio
Phase Shift
Deg
Impedances
ZRO
ohms
ZRS
ohms
ZSO
ohms
ZSS
ohms
DC Resistances
Stator
ohms
Rotor
ohms
Null Voltage
mV
Max
Electrical
minutes
Error
Output Voltage
Vrms
Weight
lb.
NOTES:
R1 resolvers are used in standard motors except as follows:
R2 resolvers are used in all double shaft and TEFC 280 and 320
frames and all single shaft 500 frames.
R1* resolvers are used with special drive excitation conditions.
Data is for estimation purposes only. For certified data, consult the
factory.
PHASING DIAGRAM OF MOTOR STATOR
Phase T1
Phase T3
R1
R2
31
49
Transmitter
Transmitter
Transmitter
Rotor
Rotor
1
1
8
8
6.5
6.5
68
85
404
510
0.5 :1
0.5 : 1
0.4856:1
-3
-5
87+j82
84+j59
82+j79
83+j59
298+j519
905+j1860
131+j248
278+j497
885+j850
122+j230
42
195
57
62
45
30
±20
±20
4.0
4.0
1
2.43
CW
Phase T2
R1*
31
Rotor
1
4
5
46
100
-5
49+j73
45+j67
52
33
15
±20
1.94
1.3
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