| Abstract |
The torque, acceleration and speed measurements in high transient conditions in rotating machines are
often a complicated and expensive matter. The methods and instruments for transient torque of an
electrical machine measurement without impact on mechanical system behaviour are described. For
this investigation a simple and effective angular acceleration sensor working on the Ferraris principle,
to determine the transient torque and velocity transients has been developed and used. The eddycurrent
acceleration-measuring sensor presented on this paper is able to give in real time the transient
shaft torque and by integration of the acceleration signal the speed of extremely wide range of all kind
of rotating machines. The torque, speed, currents and voltages of 2 various induction motors with 0,9
kW and 11 kW as test results for no-load running-up, reversing, star-delta switching transient
behaviour are presented. The calculated results of three-phase, star-connected, 4 pole, 230 V / 400 V,
11 kW and 50 Hz induction motor based on the space-phasor theory using a simulation program are
compared with measured results. |
