Patent ID: 6814549
Filing Date: 2004-11-09
Classification: F04B,F04C,F04D,H02K

Abstract:
An apparatus for protecting a fluid pump motor, the apparatus comprising:an electric motor for driving a pump head to pressurize a fluid, the electric motor comprising: a stator with one or more magnetic field producing elements for producing a magnetic field in response to a flow of electrical current through the one or more magnetic field producing elements; a rotor having a rotor shaft for driving the pump head in response to the magnetic field produced by the stator; an air gap between the stator and the rotor, wherein at least a portion of the pressurized fluid from the pump head substantially continuously flows through the motor during operation; and a liner positioned in said air gap to inhibit pressurized fluid which enters the air gap from contacting the one or more magnetic field producing elements of the stator, said liner including a thin liner wall that deforms during operation of the apparatus to bear against said one or more magnetic field producing elements for structural support as a result of loading imparted by the pressurized fluid on the liner wall.