Magnet for Motors
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
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