Encapsulated outer stator isolated rotor stepper motor valve assembly
First Claim
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1. An electric motor assembly comprising:
- a rotor rotatable about an axis;
a stator spaced radially away from the rotor, with the stator presenting an outer circumferential surface and axial margins;
an isolation housing disposed between the rotor and the stator and defining an internal rotor chamber, in which the rotor is located,said isolation housing being configured to permit magnetic flux to flow therethrough between the rotor and the stator,said isolation housing being configured for attachment to a pressurized fluid conduit,said isolation housing fluidly isolating the internal rotor chamber from the stator; and
an encapsulating cover radially and axially surrounding the stator to overlie the outer circumferential surface and axial margins of the stator,said cover bonding the stator to the isolation housing to prevent relative movement therebetween,said cover being formed of a resin material,said isolation housing comprising a generally cylindrical sleeve portion,said sleeve portion presenting first and second axial margins,said isolation housing including an end wall radially spanning the first margin to substantially seal an end of the rotor chamber,said second margin being substantially open,said isolation housing further comprising a connecting bell portion,said bell portion presenting first and second axial margins,said first margin of the bell portion being secured to the second margin of the sleeve portion to define a junction therebetween,said second margin of the bell portion being configured for operable attachment to the pressurized fluid conduit.
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Abstract
An electric motor assembly includes a rotor rotatable about an axis and a stator spaced radially away from the rotor. An isolation housing, configured to permit magnetic flux to flow therethrough between the rotor and the stator, is disposed between the rotor and the stator and defines an internal rotor chamber, in which the rotor is located. The isolation housing fluidly isolates the internal rotor chamber from the stator. An encapsulating cover is provided that radially and axially surrounds the stator. The cover is formed of a resin material and bonds the stator to the isolation housing to prevent relative movement therebetween.
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Citations
17 Claims
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1. An electric motor assembly comprising:
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a rotor rotatable about an axis; a stator spaced radially away from the rotor, with the stator presenting an outer circumferential surface and axial margins; an isolation housing disposed between the rotor and the stator and defining an internal rotor chamber, in which the rotor is located, said isolation housing being configured to permit magnetic flux to flow therethrough between the rotor and the stator, said isolation housing being configured for attachment to a pressurized fluid conduit, said isolation housing fluidly isolating the internal rotor chamber from the stator; and an encapsulating cover radially and axially surrounding the stator to overlie the outer circumferential surface and axial margins of the stator, said cover bonding the stator to the isolation housing to prevent relative movement therebetween, said cover being formed of a resin material, said isolation housing comprising a generally cylindrical sleeve portion, said sleeve portion presenting first and second axial margins, said isolation housing including an end wall radially spanning the first margin to substantially seal an end of the rotor chamber, said second margin being substantially open, said isolation housing further comprising a connecting bell portion, said bell portion presenting first and second axial margins, said first margin of the bell portion being secured to the second margin of the sleeve portion to define a junction therebetween, said second margin of the bell portion being configured for operable attachment to the pressurized fluid conduit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification