HIGH-PERFORMANCE MAGNET FOR MOTORS

Automotive-Related Products / Electric and Electronic Components
Automotive-Related Products/Magnets and Motor-Related Products
Magnets

High-Performance

Magnet for Motors

Overview

Recent concerns about the global environment have spurred a trend toward energy-saving and more-efficient electronic devices, resulting in a shift from wound motors to motors that use magnets, which are expected to grow in popularity.
In particular, the development of magnetic motors for use in energy-saving and more-efficient home electronics as well as electric and hybrid cars that aim to raise fuel efficiency is progressing. Magnetic motors are also garnering attention for use in elevators and the drivetrains of electric vehicles.
There is also potential for the use of magnetic motors in 'cleaner,' energy-conserving injection-molding machines, demand for which has led to the use of electric power in those devices.

Responses to diversity of motors:

(1) Correspond to high performance motors
(2) Minimal vibration and cogging for smooth rotation
(3) Higher efficiency in ferrite magnets, which have excellent cost performance

Magnets that will improve motors' functions are in demand.

The demand for high performance and improvements in magnetic properties of magnets used in motors is constant, making necessary improvements in features and performance other than magnetic properties to enable a wide range of applications and methods.
Hitachi Metals is developing magnets with comprehensive improvements as shown below.

High-Performance Magnets for Motors
Product		Material's Special Feature	Benefits with Use in Motors
Nd-Fe-B sintered magnet	Wet high-performance material	Highest magnetic property (see Figure 1)	Correspond to high performance motors
Nd-Fe-B sintered magnet	Radial anisotropic magnet	Enables skew magnetization sine wave (see Figure 2)	Improved cogging and higher efficiency
Ferrite magnet	Magnet with new composition including La, Co	Small coercive force temperature coefficient (see Figure 3)	Higher demagnetization resistance and thinner magnets

Figure1: NEOMAX ^® Standard Series
Figure 2: Skew Magnetization of Radial Anisotropic Nd-Fe-B Ring Magnet
Figure 3: Temperature coefficient of Intrinsic Coercive Force