Moulding stamper for magnetic shoe of permanent magnet DC motor stator and using method thereof

Abstract

The invention discloses a moulding stamper for a magnetic shoe of a permanent magnet DC motor stator and a using method thereof. An upper die head consists of a bias magnetic die insert which is embedded in the center of an upper die block and is made of a non-magnetic material, and the upper die block made of a magnetic material; an lower die head consists of a hyperboloid die block made of a non-magnetic material and a lower die holder made of a magnetic material; and the radius of a curved surface of an upper head face of the lower die holder is less than that of an inner cambered surface of the magnetic shoe. The bias magnetic die insert and the hypoid die block are arranged vertically opposite to each other so as to change the trend of magnetic lines of force in a die cavity and the distribution orientation of the magnetic field in the magnetic shoe; the magnetic field intensity in the center of an outer cambered surface of the magnetic shoe is about 10 gausses; the magnetic field intensity on two sides of the magnetic shoe is gradually increased; and the magnetic field intensity in the center of the inner cambered surface of the magnetic shoe is 7-10 times that in the center of the outer cambered surface. The permanent magnet motor is provided with the obtained magnetic shoe, so that leakage of magnetism, temperature rising and noises of the motor can be reduced; air-gap magnetic flux of the motor can be increased by 10 to 15 percent; and overall performance of the permanent magnet motor can be improved.

Description

Technical field: [0001] The invention relates to a forming die of a permanent ferrite magnetic tile. Background technique: [0002] The permanent magnet ferrite tile is an indispensable key part in all kinds of permanent magnet DC motors. The distribution of the magnetic circuit of the permanent magnet ferrite tile directly affects the air gap flux of the permanent magnet DC motor, thereby affecting the performance of the permanent magnet DC motor. performance. Permanent magnet DC motor plays a very important role in industrial automation and miniaturization. Most of the existing permanent magnet ferrite tiles are approximately parallel orientated, or approximately radially oriented. The difference in the center magnetic field of the inner and outer arc surfaces of this type of magnetic tile is small, the magnetic utilization rate is low, the motor flux leakage is serious, and the temperature rises. , Noisy. According to the performance characteristics of the motor and th...

AI Technical Summary

Problems solved by technology

Most of the existing permanent magnet ferrite tiles are approximately parallel orientated, or approximately radially oriented. This type of magnetic tile has a small difference in the center magnetic field of the inner and outer arc surfaces, and the magnetic utilization rate is low. The motor flux leakage is serious and the temperature rises. , noisy

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