PERMANENT-MAGNETIC RADIAL ROTATING JOINT AND MICROPUMP COMPRISING SUCH A RADIAL ROTATING JOINT
The invention relates to a permanent-magnetic radial rotary coupling ( 100 ) comprising a first cylindrical permanent magnet ( 102 ) and a second hollow-cylindrical permanent magnet ( 104 ), wherein the inner diameter of the second permanent magnet ( 104 ) is larger than the outer diameter of the first permanent magnet ( 102 ). The first permanent magnet ( 102 ) and the second permanent magnet ( 104 ) are arranged coaxially and mounted such that they can rotate about the common axis ( 106 ). Both the first permanent magnet ( 102 ) and the second permanent magnet ( 104 ) comprise at least one pole pair. The first permanent magnet ( 102 ) comprises the same number of pole pairs as the second permanent magnet ( 104 ). The first permanent magnet ( 102 ) has a radial or a parallel magnetization and the second permanent magnet ( 104 ) comprises a Halbach array, the strong side of which is the inner side of the second permanent magnet ( 104 ).
1 . A permanent-magnetic radial rotary coupling for use in a micropump to facilitate fluid flow within a heart, the permanent-magnetic radial rotary coupling comprising:
a first cylindrical permanent magnet being mounted such that the first cylindrical permanent magnet is configured to rotate about a common axis, the first cylindrical permanent magnet comprising:
an outer diameter;
a first amount of pole pairs; and
a magnetization being radial or parallel;
a second hollow-cylindrical permanent magnet being arranged coaxially relative to the first cylindrical permanent magnet and being mounted such that the second hollow-cylindrical permanent magnet is configured to rotate about the common axis, the second hollow-cylindrical permanent magnet comprising:
an inner diameter being larger than the outer diameter of the first permanent magnet;
a second amount of pole pairs, the second amount being equal to the first amount of pole pairs; and
a Halbach array comprising a strong side, the strong side being located on an inner side of the second hollow-cylindrical permanent magnet.
2 . The permanent-magnetic radial rotary coupling of claim 1 , wherein an outer diameter of the second hollow-cylindrical permanent magnet is less than 10 mm.
3 . The permanent-magnetic radial rotary coupling of claim 1 , wherein the Halbach array of the second hollow-cylindrical permanent magnet has segments.
4 . The permanent-magnetic radial rotary coupling of claim 1 , wherein the first permanent magnet is a hollow-cylinder.
5 . The permanent-magnetic radial rotary coupling of claim 1 , further comprising a shaft being disposed inside the first permanent magnet.
6 . The permanent-magnetic radial rotary coupling of claim 1 , wherein an axial length of the first permanent magnet is equal to an axial length of the second hollow-cylindrical permanent magnet.
7 . The permanent-magnetic radial rotary coupling of claim 1 , further comprising a device for magnetic return being disposed on an outside of the second hollow-cylindrical permanent magnet.
8 . A micropump to facilitate fluid flow within a heart, the micropump comprising:
a first cylindrical permanent magnet being mounted such that the first cylindrical permanent magnet is configured to rotate about a common axis, the first cylindrical permanent magnet comprising:
an outer diameter;
a first amount of pole pairs; and
a magnetization being radial or parallel;
a second hollow-cylindrical permanent magnet being arranged coaxially relative to the first cylindrical permanent magnet and being mounted such that the second hollow-cylindrical permanent magnet is configured to rotate about the common axis, the second hollow-cylindrical permanent magnet comprising:
an inner diameter being larger than the outer diameter of the first permanent magnet;
a second amount of pole pairs, the second amount being equal to the first amount of pole pairs; and
a Halbach array comprising a strong side, the strong side being located on an inner side of the second hollow-cylindrical permanent magnet.
9 . The micropump of claim 8 , wherein an outer diameter of the micropump is less than 10 mm.
10 . The micropump of claim 9 , wherein the outer diameter of the micropump is less than 8 mm.
11 . The micropump of claim 8 , wherein an axial length of the first permanent magnet is different than an axial length of the second hollow-cylindrical permanent magnet.
12 . The micropump of claim 8 , wherein the first permanent magnet is positioned longitudinally offset in an axial direction relative to the second hollow-cylindrical permanent magnet.
13 . The micropump of claim 12 , wherein the axial direction is in a direction away from the second hollow-cylindrical permanent magnet.
14 . The micropump of claim 8 , further comprising:
a driving shaft connected to the first permanent magnet; and
an output shaft connected to the second hollow-cylindrical permanent magnet.
15 . The micropump of claim 1 , wherein the micropump is configured for driving an impeller-shaped rotor.
16 . The permanent-magnetic radial rotary coupling of claim 2 , wherein an outer diameter of the micropump is less than 10 mm.
17 . The permanent-magnetic radial rotary coupling of claim 1 , wherein an axial length of the first permanent magnet is different than an axial length of the second hollow-cylindrical permanent magnet.
18 . The permanent-magnetic radial rotary coupling of claim 1 , wherein the first permanent magnet is positioned longitudinally offset in an axial direction relative to the second hollow-cylindrical permanent magnet.
19 . The permanent-magnetic radial rotary coupling of claim 18 , wherein the axial direction is in a direction away from the second hollow-cylindrical permanent magnet.
20 . The permanent-magnetic radial rotary coupling of claim 1 , wherein an axial length of the permanent-magnetic radial rotary coupling is 5 mm.
21 . The permanent-magnetic radial rotary coupling of claim 1 , further comprising:
a driving shaft connected to the first permanent magnet; and
an output shaft connected to the second hollow-cylindrical permanent magnet.
22 . The permanent-magnetic radial rotary coupling of claim 1 , wherein the permanent-magnetic radial rotary coupling is configured for use in a micropump for driving an impeller-shaped rotor.