PLASTIFORM® Flexible Bonded Magnets p. 7.1 February 2003 Rev. B PLASTIFORM DIVISION

p. 7.2 February 2003 Rev. B PLASTIFORM® bonded magnets represent the culmination of years of research and development focused on enhancing the magnetic and physical properties of polymerized magnet material. Since their development in the mid-60s, bonded magnet materials have evolved from low-energy and limited geometries into high-energy materials of nearly unlimited versatility. From flexible rolls and sheets magnetized with dense multi-pole patterns, to intricate injection- and insert-molded shapes, Arnold PLASTIFORM® bonded magnets offer unprecedented design versatility and uncompromising...

p. 7.3 February 2003 Rev. B Energy product 1.4 MGOe flexible permanent magnet material • Strong resistance to demagnetization • Machinability permits simple and inexpensive shaping and assembly processing • Flexibility permits ease of handling, fabricating and assembly • Resilience prevents chipping, cracking or shattering • Close dimensional and magnetic tolerances allow substantial cost reduction • Adaptability to automated assembly and low reject rates provide economies of use PLASTIFORM® Flexible Permanent Magnet Material, energy product 1.4 MGOe, has a cured (vulcanized) nitrile rubber binder...

p. 7.4 February 2003 Rev. B PLASTIFORM® 1013 and 1030 Magnet Material Continuous strip capability The flexibility of this material allows it to be supplied in continuous strips. This is advantageous to the DC motor manufacturer both in terms of production cost and performance. Motor strips can be cut precisely to length, with all magnetic poles exhibiting precisely the same magnetic properties. In DC motors, this condition enhances smooth motor operation and minimizes brush wear. Continuous strip capability is also advantageous to the manufacturer who fabricates parts which may be used as automated...

p. 7.5 February 2003 Rev. B PLASTIFORM® 1013 and 1030 Magnet Material Arnold application engineering services Arnold Application Engineering Services personnel are available for assistance in the following areas: Application inquiries—provide answers to technical questions on magnet use for proposed applications. Magnetization requirements—assist in defining requirements for production magnetizers, poling fixtures, and peripheral equipment in accordance with specific application needs. Magnetic optimization—provide magnetic circuit design suggestions to achieve optimum product performance. Prototype...

p. 7.6 February 2003 Rev. B PLASTIFORM® 1013 and 1030 Magnet Material Typical Demagnetization Curve @ 23°C (73°F)* 5000 4500 4000 3500 3000 2500 2000 1500 1000 1500 1000 2500 2000 500 0 500 -H (Oersteds) B (Guass) INTRINSIC NORMAL * All values shown are typical and are not intended for specification purposes. Specification values will be provided upon request. PLASTIFORM® 1.4 Br 2450 Gauss Hc 2200 Oersteds Hci 3250 Oersteds BH max 1.40 MGOe * All values shown are typical and are not intended for specification purposes. Specification values will be provided upon request. ** Good—minor or no effect;...

p. 7.7 February 2003 Rev. B Tech Tips—PLASTIFORM® 1030 Magnet Material Prototyping for DC PM motors and brushless motors with PLASTIFORM® flexible permanent magnet material 1030 PLASTIFORM® Flexible Permanent Magnet Material 1030 consists of barium ferrite oriented in a cured (vulcanized) nitrile rubber binder. Combining the magnetic properties typical of barium ferrite with flexibility and excellent magnetic and dimensional tolerances, 1030 material provides a wide range of benefits in DC PM motor and brushless motor applications. When prototyping with a 1030 material, the following parameters...

p. 7.8 February 2003 Rev. B Tech Tips—PLASTIFORM® 1030 Magnet Material Determining magnet strip length Because of their flexibility, PLASTIFORM® 1030 magnets adapt to the shape of the surface to which they are applied. In DC motor and brushless motor applications, this property permits a snug or compression fit between magnet and motor housing without bonding or gluing. The result is minimization of the air gap, provided that the correct length of magnet strip has been used. Proper strip length may be calculated as follows: Magnet strip length = Nominal inner diameter of motor housing minus the...

p. 7.9 February 2003 Rev. B Tech Tips—PLASTIFORM® 1030 Magnet Material The importance of testing relative to proper magnet length stems from the fact that excessively long magnet strips may create so much compression at the butt joint that the magnet material is pushed into the air gap, possibly causing armature interference. On the other hand, magnet strips that are too short could cause armature interference by moving away from the inside wall of the housing. The use of strips of insufficient length may also contribute to axial movement. The motor housing inner diameter tolerances must also...

p. 7.10 February 2003 Rev. B Tech Tips—PLASTIFORM® 1030 Magnet Material Fabricating 1030 magnet samples 1030 Sample material is available in standard sheets 3" wide x 24" long, in thicknesses of .030", .060", .090", .125", .156”, .186", .250", .312" and .375". Finished parts can be fabricated from these sheets in a machine shop using standard tools such as knives, guillotine cutters, band saws, drills, punches and grinding equipment. The length of the finished magnet part should be cut from the web direction or the 24" length dimension of the sheet material (Figure C). It should not be cut from...

p. 7.11 February 2003 Rev. B Tech Tips—PLASTIFORM® 1030 Magnet Material Inserting magnet samples into motor housings A simple hand insertion tool can be made in a machine shop to provide uniform insertion of the magnet strip into the motor housing (Figure D). The magnet strip is hand-loaded into the wide opening of the inserter or strip former. The inserter is then placed on top of the motor housing. The curled magnet strip is pushed down the length of the inserter and into the motor housing by the plunger (Figure D). An arbor press can be used to aid this procedure. Arnold technical service...