Foot spa with UV lights
A spa is provided that includes: a basin; a motor having a shaft defining a rotation axis; a hub mounted to the shaft, the hub having North and South pole domains spaced apart from each other and arranged to encircle the rotation axis in alternating relation; and an impeller which is disposed in the basin in axially spaced relation to the hub and is at least substantially constrained against movement but for rotation about the axis, the impeller including a rotor body of a non-magnetic, electrically-conductive material having relatively low magnetic permeability. The improvement in which is that there are lights and coils coupled to the impeller for rotation therewith, the lights and coils being coupled and adapted such that, in use, the rotating magnetic fields associated with the drive hub created induced currents in the coils which actuate the lights and create a net force that rotates the impeller.
1. A spa comprising:
a basin for containing water;
a motor mounted exteriorly of the basin and having a rotating shaft, the shaft defining a rotation axis orientated towards the interior of the basin;
a drive hub mounted to the shaft for rotation therewith, the hub having two or more North pole domains and two or more South pole domains, the North and South pole domains being spaced apart from each other and arranged to encircle the rotation axis in alternating relation; and
an impeller which is disposed in the basin in axially spaced relation to the drive hub and is at least substantially constrained against movement but for rotation about the rotation axis, the impeller including a rotor body of a non-magnetic, electrically-conductive material having relatively low magnetic permeability,
wherein the improvement comprises:
one or more lights coupled to the impeller for rotation therewith; and
one or more coils coupled to the impeller for rotation therewith and coupled to the lights,
the lights and coils being adapted such that, in use, the rotating magnetic fields associated with the drive hub created induced currents in the coils which actuate the lights and create a net force that rotates the impeller.
2. The spa according to claim 1 , wherein each of the North pole domains is defined by a respective permanent magnet and each of the South pole domains is defined by a respective permanent magnet.
3. The spa according to claim 2 , wherein the number of North pole domains equals the number of South pole domains.
4. The spa according to claim 3 , wherein, in use, the permanent magnets are equally spaced about the rotation axis.
5. The spa according to claim 4 , wherein the rotor body is a made of a paramagnetic material.
6. The spa according to claim 4 , wherein the rotor body is made of an aluminum alloy.
7. The spa according to claim 4 , wherein the permanent magnets are disc-shaped.