Two pole permanent magnet rotor construction method
First Claim
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1. A method of making a two pole magnet rotor for an electrical machine, comprising the step of:
- forming a cylindrical two pole permanent magnet from a plurality of small magnet blocks aligned with the same axis of magnetic polarity assembled in a solid overlaying relationship;
bonding a first end piece onto one end of said cylindrical two pole permanent magnet;
bonding a second end piece onto the other end of said cylindrical two pole permanent magnet; and
installing a thin cylindrical retaining hoop in interference fit fashion around said cylindrical two pole permanent magnet and the portions of said first and second end pieces adjacent to said cylindrical two pole permanent magnet.
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Abstract
A two pole permanent magnet rotor which utilizes a single cylindrical two pole permanent magnet mounted between two end pieces and surrounded by a retaining hoop. The cylindrical two pole permanent magnet, which is made of high energy product material, is "straight through" diametrically magnetized to provide a sinusoidal air gap flux distribution which eliminates losses due to harmonics. The cylindrical two pole permanent magnet may be made of a plurality of smaller magnet blocks which are stacked and machined to form cylindrical configuration.
49 Citations
11 Claims
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1. A method of making a two pole magnet rotor for an electrical machine, comprising the step of:
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forming a cylindrical two pole permanent magnet from a plurality of small magnet blocks aligned with the same axis of magnetic polarity assembled in a solid overlaying relationship; bonding a first end piece onto one end of said cylindrical two pole permanent magnet; bonding a second end piece onto the other end of said cylindrical two pole permanent magnet; and installing a thin cylindrical retaining hoop in interference fit fashion around said cylindrical two pole permanent magnet and the portions of said first and second end pieces adjacent to said cylindrical two pole permanent magnet. - View Dependent Claims (2, 3, 4, 5)
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6. A method of making a two pole permanent magnet rotor for an electrical machine comprising the steps of:
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assembling and bonding together a plurality of small magnet blocks in overlaying relationship with aligned axis of magnetic polarity to form a solid cylinder of magnetic material having the magnetic axis aligned along a diameter of the cross section of said solid cylinder and all magnetic flux lines through said solid cylinder of magnetic material parallel to the magnetic axis; bonding a first end piece of non-magnetizable material at one end of said solid cylinder of magnetic material; bonding a second end piece of non-magnetizable material mounted at the other end of said solid cylinder of magnetic material; and retaining said solid cylinder of magnetic material and those portions of said first and second end pieces adjacent to said solid cylinder of magnetic material within a thin cylindrical hoop. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification