Air conditioning valve actuator for a motor vehicle
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United States of America Patent
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Feb 8, 2005
Grant Date -
N/A
app pub date -
May 17, 2002
filing date -
Nov 17, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
An air conditioning valve actuator for a motor vehicle operating on an electric step motor with a permanent magnet capable of delivering mechanical power at least equal to 50 mW, and a reduction unit for decreasing the amplitude of the angular pitch and increase the output torque. The motor is defined by the following relationship: 10.sup.-6 <.gamma..sup.2 /R.sub.0 <, wherein: .gamma. is the torque constant, proportional to the magnet volume and, R.sub.0 is the characteristic coefficient of the volume of copper and the length of the average turn of the coils, in which R.sub.0 =.rho..Lsp/(Scu..sigma.), .rho. being the resistivity of copper, Lsp being the length of the average turn of a coil, Scu being the copper section of a coil and .sigma. the filling coefficient of a coil. A controller is cooperative with the motor power supply enabling to accelerate gradually the frequency of the supply of the windings.
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