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MAGNET FOR VIBRATING MOTORS IN MOBILE DEVICES

MAGNET FOR VIBRATING MOTORS IN MOBILE DEVICES
Magnet for vibrating motors in mobile devices

Overview

As the markets for mobile phones, videogame machines and other mobile devices grow, the devices are becoming increasingly compact and lightweight. Most of these devices are equipped with a vibrating motor for pagers. Restrictions on the shape and size of magnets and motors stemming from the demand for further compactness in these devices—particularly in coreless DC motors—have required increasingly compact and high-performance magnets and motors. Consequently, these devices are employing neodymium-sintered magnets as a material to replace more-conventional neodymium bonded magnets and samarium-cobalt sintered magnets.

Hitachi Metals has created a compact, high-performance neodymium sintered magnet to respond to such applications.

Features

Figure 1 shows an external view of representative products, while Chart 1 shows representative dimensions. Although there exist diametric anisotropic magnets for standard cylindrical motors as well as radial anisotropic magnets for compressed motors, these new products realize magnets of stable quality with little dimensional variation and of minimal diameter and thickness. Dimensional tolerance of the outer diameter and height is ±0.05mm.

Chart 1: Representative Dimensions of Magnet for Vibrating Motors in Mobile Devices

   Outer Diameter (mm) Height (mm) Surface Treatment
General type φ2.0—2.5 4—8±0.05 Nickel-plated or resin-deposed coating
(thickness: 5—25μm)
Compressed type φ4.0—12±0.05 0.5—1.5±0.05 Nickel-plated or resin-deposed coating
(thickness: 5—25μm)

Properties

Chart 2 shows representative measures of the magnetic properties of the magnet. The use of neodymium high-performance materials enables selection from a wide range of magnetic properties, from Br magnesium, which is commonly employed for general-use devices, to highly coercive magnets for applications in which thermal reliability is necessary.

Chart 2: Representative Magnetic Properties of Magnets for Vibrating Motors in Mobile Devices

Material Code Remanence
Br		 Coercivity Maximum Energy Type (BH)
(BH)max.
HCB HCJ
T kG kA/m kOe kA/m kOe kJ/m3 MGOe
NMX-S54 1.45—1.51 14.5—15.1 939—1153 11.8—14.5 ≥875 ≥11 405—437 51—55
NMX-S52 1.42—1.48 14.2—14.8 835—994 10.2—12.5 ≥875 ≥11 389—421 49—53
NMX-S50BH 1.39—1.45 13.9—14.5 1042—1122 13.1—14.1 ≥1114 ≥14 374—405 47—51
NMX-S49CH 1.36—1.43 13.6—14.3 1018—1106 12.8—13.9 ≥1273 ≥16 358—397 45—50
NMX-S45SH 1.30—1.37 13.0—13.7 970—1058 12.2—13.3 ≥1671 ≥21 326—366 41—46
NMX-S43SH 1.28—1.35 12.8—13.5 962—1042 12.1—13.1 ≥1830 ≥23 316—350 39—44
NMX-S41EH 1.24—1.31 12.4—13.1 923—1018 11.6—12.8 ≥1990 ≥25 294—334 37—42
NMX-S38EH 1.19—1.27 11.9—12.7 883—978 11.1—12.3 ≥2228 ≥28 270—310 34—39
NMX-S36UH 1.16—1.24 11.6—12.4 863—962 11.1—12.1 ≥2387 ≥30 254—294 32—37
NMX-S34GH 1.12—1.20 11.2—12.0 859—939 10.8—11.8 ≥2626 ≥33 238—278 30—35
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