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6F3A4768
5.4.6.2 Resolver
A resolver is a sensor that detects the rotating angle (position) of the motor. This resolver converts changes in
position into speed signals at periodic intervals.
Two types of resolvers are available, 1x type and 4x type.
(1) 1x type
This type of resolver detects one electrical rotation as the motor rotates one rotation. This resolver is used
for relatively high-speed motors.
(2) 4x type
In this resolver, the number of resolver phases is increased. This resolver detects one electrical rotation as
the motor rotates 1/4 rotation. This resolver is used for low-speed motors (1000 min
1
or less).
Excitation
circuit 1 kHz
Detection circuit
Oscillation
circuit
1 kHz
Position detection circuit
Frequency
difference
detection circuit
VCO
A
B
C
D
E
F
G
H
S4
S1
S3
S2
R1
R3
R2
R
d/dt
SP_F
θ
0
detection
Resolver TS2118N24E10, 4 X type
Fig. 5.4.4 Resolver Speed Detection
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