Affiliations: [a] Beijing Key Laboratory of Thermal Science and
Technology, Technical Institute of Physics and Chemistry, Chinese Academy of
Sciences, Beijing, China | [b] University of Chinese Academy of Sciences, Beijing,
China
Correspondence:
[*]
Corresponding author: Huiming Zou, Beijing Key Laboratory of
Thermal Science and Technology, Technical Institute of Physics and Chemistry,
Chinese Academy of Sciences, Beijing, China. Tel.: +86 010 8254 3433; Fax: +86
010 8254 3696; E-mail: zouhuiming77@126.com
Abstract: The stroke and natural frequency are key controlling quantities for
linear compressor controller. This paper proposes a phasor algorithm for the
linear compress stroke and natural frequency calculation. The phasor algorithm
employs vectors to express the voltage, current and velocity respectively for
the calculation in frequency domain. A test bench has been installed, and the
feasibility of phasor algorithm is verified with the linear compressor load
changing. The relative deviation of the calculated stroke can be achieved
within ± 3% experimental results at 0.4 MPa, 0.5 MPa
and 0.6 MPa discharge pressure respectively. The calculated results shows that
the computation time of phasor algorithm is one-third shorter than that of time
domain algorithm, which means it is possible to employ relatively low energy
consumption and low cost hard ware. The calculation natural frequency decreases
with the stroke increases at 0.4 MPa, 0.5 MPa and 0.6 MPa discharge pressure
respectively, and the tested motor efficiency reaches a maximum when the
calculated natural frequency equals to the operating frequency.
Keywords: Linear compressor control, stroke estimation, natural frequency estimation, phasor algorithm
