Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A globally exponentially stable position observer for interior permanent
  magnet synchronous motors   The design of a position observer for the interior permanent magnet
synchronous motor is a challenging problem that, in spite of many research
efforts, remained open for a long time. In this paper we present the first
globally exponentially convergent solution to it, assuming that the saliency is
not too large. As expected in all observer tasks, a persistency of excitation
condition is imposed. Conditions on the operation of the motor, under which it
is verified, are given. In particular, it is shown that at rotor
standstill---when the system is not observable---it is possible to inject a
probing signal to enforce the persistent excitation condition. {The high
performance of the proposed observer, in standstill and high speed regions, is
verified by extensive series of test-runs on an experimental setup.

22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess