Abstract
The creeping speed mode is studied with calculation of the resultant vector of the flux linkage ψ 0 of the double-fed machine. It is shown that use of the double-fed machine as the actuating motor in the creeping speed mode increases the working off accuracy of the motion law. A mathematical model of the double-fed machine to study various modes of the CNC machine including the creeping speed mode is developed. The method to estimate the load parameters of the double-fed machine is presented. Practical implication of the study is confirmed by the results obtained in the evaluation of the influence of load parameters on the dynamic indicators of actuating electromotor.
Highlights
Any measuring equipment incorporates the systems of the fixed current parameters, comparison with a reference element and compensation of the measuring error [1]
Two rotating electromagnetic fields arise during the double-fed machine (DFM) operation in the creeping speed mode for hodograph of the resultant vector of flux linkage ψ0: the first field is generated by the frequency f1=f2=50 Hz and the second one is generated by f3=f4=51 Hz from the primary and secondary elements respectively
The disadvantage is inability to investigate the model in case of simultaneous changes in the load parameters
Summary
Any measuring equipment incorporates the systems of the fixed current parameters, comparison with a reference element and compensation of the measuring error [1] In these systems, modern CNC machines are used; many engines with relatively small power are involved in their work, the basic modes of operation of these engines are “unnatural” [2]. The feature of the creeping speed mode is an operation at the speed of the tool movement from 2 to 10 mm/min [3] This mode is widely used in the CNC machines (for processing and plasma cutting), aboard mechanisms of antenna rotation, detection systems for mobile and ground equipment, fixation systems of outdoor surveillance, textile industry (warp sizing machine), and discrete measurement systems with CNC (two-dimensional electromagnetic displacement sensors) [10,11,12]. This type of the tool movement is often implemented due to the presence of linear asynchronous engines (LAE), actuating motor and ball-and-screw unit or electromagnetic frame
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