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US 5,703,418 AGranted
DC cooled linear motor
AssigneeNorthern Magnetics, Inc.
InventorShlomo Assa
Life of this patent
Estimating the term…
Abstract
A DC linear motor is cooled by providing a cooling duct extending transversely through the base mounting a coil. The coil is moveable along a track which is parallel to an extended permanent magnet. The cooling air is directed transversely along the width of the base. The compressed air passes through the duct and exits ports which extend transversely relative to the duct and the track. The air is ejected into the air gap between the permanent magnet and the coil.
Claims16
A DC linear motor, comprising:
- a primary extending in a linear direction,
- a current receiving coil mounted on a base for linear movement on a track extending in the linear direction, an air gap defined between the coil and the primary, a base including means for receiving a cooling fluid, and
- a duct for directing the cooling fluid through the base to effect cooling,
- the primary being a permanent magnet having two arms, and the coil extends between the arms, such that an air gap is defined between each arm and the coil, and wherein cooling is effected in each air gaps, and
- wherein the duct include multiple spaced ports exiting from the duct thereby to eject cooling fluid into the air gap.
2 more elements
A DC linear motor, comprising:
- a primary extending in a linear direction,
- a current receiving coil mounted on a base for linear movement on a track extending in the linear direction, an air gap defined between the coil and the primary, a base including means for receiving a cooling fluid, and
- a duct for directing the cooling fluid through the base to effect cooling,
- the primary being a permanent magnet having two arms, and the coil extends between the arms such that an air gap is defined between each arm and the coil, and wherein cooling is effected in each air gaps, and
- there being several ducts in the base, the ducts being relatively spaced from each other, and the ducts being directed transversely relative to the track, the ducts having multiple spaced ports.
2 more elements
A DC linear brushless motor comprising:
- a U-shaped permanent magnet extending in a linear direction,
- a coil having a multi-phased current receiving windings mounted in a base for linear movement in a track extending in the linear direction,
- a first air gap between one arm of the U-shaped magnet and the coil, and a second air gap between the second arm of the U-shaped magnet and the coil,
- a duct extending across a width of a base mounting the coil, and ports directed from the duct into both of the first air gap and the second air gap, and
- an inlet to the duct for a cooling gas such that the gas entering the duct exits from the ports into the air gaps between the base and the magnet.
2 more elements
A DC linear brushless motor comprising:
- a U-shaped permanent magnet extending in a linear direction,
- multi-phased current receiving windings of a coil mounted in a base for linear movement in a track extending in the linear direction, the base defining a width, and the duct including several ports, the ports being spaced from each other and being directed to project cooling air at spaced intervals along the width of the base,
- a first air gap between one arm of the U-shaped magnet and the coil, and a second air gap between the second arm of the U-shaped magnet and the coil,
- the ducts extending across a width of a base mounting the coils, the ducts being formed of a non-magnetic material molded into the base, the base being formed of a non-magnetic material, and
- an inlet to the ducts for a cooling gas such that gas entering the duct and an exit for the gas from the ducts.
2 more elements
Dependencies are inferred from the claim text.