Flexible machine mounting

Claim 2

A mounting for a dynamoelectric machine having rotary vibration, said mounting comprising, in combination, a frame having an axis, a plurality of first pin members extending substantially parallel to and spaced around said axis, a plurality of first support members each for a respective first pin member, first flexible connecting means between said first members, said plurality of first support members defining support wall means engaging said first flexible connecting means to support same, a plurality of second pin members extending substantially parallel to and spaced around said axis, a plurality of second support members each for a respective second pin member, second flexible connecting means between said second members, said plurality of second support members defining support wall means engaging said second flexible connecting means to support same, a plurality of substantially rigid links one each interconnecting one of said first and one of said second members and extending substantially radially, first fastening means fastening the other of said first members to said machine, second fastening means fastening the other of said second members to said frame, the diameter of the first pin members being sufficiently small to establish the natural frequency of rotary vibration fc about said axis equal to 1/2 pi square root KR/IM, where KR is the spring constant of said first flexible connecting means, IM is the moment of inertia of the stator of the dynamoelectric machine, and fc is less than one-half and preferably less than about one-fifth of the applied frequency of magnetic vibration.

Claim 3

A mounting as set forth in claim 1, wherein said first pin members are each paced at substantially the same radial distance from said axis, each of said second pin members being spaced substantially equally from said axis and at a greater distance from said first pin members.

Claim 4

A mounting as set forth in claim 1, wherein said first fastening means includes spokes interconnecting said first pin members and said machine.

Claim 5

A mounting as set forth in claim 1, wherein said second fastening means includes relatively rigid rods fastening said second pin members to said frame.

Claim 6

A mounting as set forth in claim 4, including a ring substantially normal to said axis and interconnecting said rods.

Claim 7

A mounting as set forth in claim 1, wherein each of said rigid links includes a first and a second support member on opposite ends thereof.

Claim 8

A mounting as set forth in claim 1, wherein said first fastening means includes a plurality of symmetrically disposed spokes radiating from and fixed to said machine, and a right angle bend in each spoke so that the outer end thereof lies parallel to said axis and constitutes the respective first pin member.

Claim 9

A mounting as set forth in claim 1, wherein the radial length of each of said links is in the order of 40 percent of the radial distance from said axis to said first pin members, and said first pin members being spaced closer to said axis than said second pin members.

Claim 10

A mounting as set forth in claim 1, wherein the center of gravity of said machine is in a plane normal to said axis and which plane passes through each of said rigid links.

Claim 11

A mounting as set forth in claim 1, wherein said first support members are first collar members defining aperture wall means at least partially surrounding a respective first pin member.

Claim 12

A mounting as set forth in claim 1, wherein said second support members are second collar members defining aperture wall means at least partially surrounding a respective second pin member.

Claim 13

A mounting as set forth in claim 1, wherein said firSt and second support members are collar members at least partially surrounding a respective pin member.

Claim 14

A mounting as set forth in claim 12, wherein said first and second flexible connecting means includes an elastic sleeve substantially filling the space between the respective pin member and the respective collar member.

Claim 15

A mounting as set forth in claim 12, wherein the respective pin member and collar member are substantially coaxial.

Claim 16

A mounting as set forth in claim 12, wherein each of said collar members is substantially cylindrical surrounding a respective cylindrical pin member, and said flexible connecting means are compressible elastic rubber-like members disposed between the pin members and the respective collar members.

Claim 17

A mounting as set forth in claim 12, wherein each of said collar members circumscribes at least 180* of the respective pin member.

Claim 18

A mounting as set forth in claim 12, wherein each of said rigid links has a rigid connection to one of said first and second collar members.

Claim 19

A mounting as set forth in claim 12, wherein each of said rigid links has a rigid connection to one of said first and one of second collar members on opposite radial ends thereof.

Claim 20

A mounting as set forth in claim 1, wherein each of said rigid links includes a first and a second pin member on opposite ends thereof.

Claim 21

A mounting as set forth in claim 12, wherein each of said rigid links has a rigid connection to one of said first pin and collar members.

Claim 22

A rotationally flexible mounting for an electric motor having rotary vibration in the order of 120 Hz when operated at 60 Hz alternating voltage, said mounting comprising, in combination, a mounting panel having a fan aperture, three relatively rigid rods extending perpendicularly to said panel and generally symmetrically surrounding said fan aperture in said panel, three spokes radiating from and fixed to said electric motor in the direction toward said three rods, a first ring substantially parallel to said panel and interconnecting said three rods to add structural stiffness in a direction perpendicular to the axis of said motor and panel aperture, a second ring substantially parallel to said panel and interconnecting said three spokes to add structural stiffness thereto in a direction perpendicular to said axis, each of said spokes having a right angle bend to have a leg portion substantially parallel to said axis and disposed relatively closely to a respective one of said rods, three rigid radial links, each having two tubular collars and an interconnecting web, a compressible elastic sleeve within each collar of each link and embracing a spoke leg portion and a rod respectively to mount said motor coaxially relative to said fan aperture, the radial length of each of said links being in the order of 40 percent of the radial distance from the motor axis to said leg portions, the center of gravity of said motor lying in a plane normal to said axis which passes through said links, said elastic sleeves being slightly compressed between the link collars and respective leg portion and rod to permit rotational flexibility of the motor and consequent slight oscillation of each link about the respective rod without transmitting any appreciable amount of said rotational vibration to said fan mounting panel.

Claim 23

A rotationally flexible mounting for an electric motor having rotary vibration in the order of 120 Hz when operated at 60 Hz alternating voltage, said mounting comprising, in combination, a mounting panel having a fan aperture, three relatively rigid rods extending perpendicularly to said panel and generally symmetrically surrounding said fan aperture in said panel, three spokes radiating from and fixed to said electric motor in the direction toward said three rods, a first ring substantially parallel to said panel and interconnecting said three rods to add structural stiffness in a direction perpendicular to the axis of said motor and panel aperture, a second ring substantially parallel to said panel and interconnecting said three spokes to add structural stiffness thereto in a direction perpendicular to said axis, each of said spokes having a right angle bend to have a leg portion substantially parallel to said axis and disposed relatively closely to a respective one of said rods, three rigid radial links, each having two tubular collars and an interconnecting web, a compressible elastic sleeve within each collar of each link and embracing a spoke leg portion and a rod respectively to mount said motor coaxially relative to said fan aperture, the radial length of each of said links being in the order of 40 percent of the radial distance from the motor axis to said leg portions, the center of gravity of said motor lying in a plane normal to said axis which passes through said links, said elastic sleeves being slightly compressed between the link collars and respective leg portion and rod to permit rotational flexibility of the motor and consequent slight oscillation of each link about the respective rod without transmitting any appreciable amount of said rotational vibration to said fan mounting panel.

Claim 24

A mounting as set forth in claim 1, wherein each of said pin members has a diameter less than 10 percent of the distance from said axis to said first pin members.

Claim 25

A flexible mounting as set forth in claim 21, wherein each of said leg portions of said spokes has a diameter less than 10 percent of the distance from said leg portion to the axis of said motor.

Claim 26

A mounting as set forth in claim 1, wherein each of said rigid links interconnects a pin member to a support member.