5.1.3
Explain the position sensors
b.
resolvers
– Rotary
electrical transformer used for measuring degrees of rotation. It is considered
an analog device, and has a digital counterpart, the rotary (or pulse) encoder.
– Resolver Applications
Permanent
Magnet (PM) Motor Commutation and Speed
Control
AC & DC Servo Motor Commutation
and Speed Control
What are Position Sensors?
ReplyDelete- Most common way of classifying the wide spectrum of sensors is based on the specific application of the sensor.
- Sensor used for measuring humidity is termed as humidity sensor,
- the one used for measurement of pressure is called pressure sensor,
-sensor used for measurement of liquid level is called level sensor and so on though all of them may be using the same sensing principle.
source : http://www.engineersgarage.com/articles/position-sensors
Receiver resolvers
ReplyDelete- These resolvers are used in the opposite way to transmitter resolvers (the type described above).
- The two diphased windings are energized, the ratio between the sine and the cosine representing the electrical angle.
- The system turns the rotor to obtain a zero voltage in the rotor winding.
- At this position, the mechanical angle of the rotor equals the electrical angle applied to the stator.
Differential resolvers
- These types combine two diphased primary windings in one of the stacks of sheets, as with the receiver, and two diphased secondary windings in the other.
- The relation of the electrical angle delivered by the two secondary windings and the other angles is secondary electrical angle, mechanical angle, and primary electrical angle.
- These types were used, for instance, as analog trigonometric-function calculators.
source : http://en.wikipedia.org/wiki/Resolver_(electrical)