JPS6034354B2 - Manufacturing method of Warren type synchronous motor rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a Warren-type synchronous motor rotor, which is a polymorphic body.

Conventionally, competitive alloy steels such as carbon steel or tungsten steel have been used as rotor materials for Warren type synchronous motors, all of which have isotropic magnetic properties.

As shown in FIG. 2, the rotor of the Warren type synchronous motor is a shape-variable body composed of an annular magnetic path section 5 and a central magnetic path section 6. In manufacturing a rotor body having an anisotropic shape for use in the above-mentioned Warren type synchronous motor, the present invention is produced by punching a material having magnetic anisotropy by changing the direction of the central magnetic path of the rotor. The purpose is to improve various characteristics of electric motors.

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a Warren-type synchronous motor. The motor consists of a rotor 1 and a stator 3 having a bear ring 4. This rotor 1 has an annular magnetic path section 5, a central magnetic path section 6, It consists of

Examples of materials having magnetic anisotropy include Bicaloy magnets, carbon steel magnets, Fe-Mn semi-hard magnets, etc. In the embodiment of the present invention, rolled Fe-Mn semi-hard magnets were selected, as shown in FIG. The central magnetic path section 6 of the rotor 1, which is an anisotropic body consisting of an annular magnetic path section 5 and a central magnetic path section 6, is oriented at different angles with respect to the rolling direction of the material 2 having rolling magnetic anisotropy. Punch out like this.

That is, in A, the central magnetic path portion 6 is oriented in the same direction as the rolling direction, and in B, the central magnetic path portion 6 is at 45 degrees with respect to the rolling direction.
C shows the case where the central magnetic path portion 6 is perpendicular to the rolling direction. In this way, by punching the central magnetic path part 6 of the rotor body 1, which is anisotropic in shape, from the material 2 having anisotropic magnetic properties while changing the direction, the central magnetic path part 6 and the annular magnetic path are formed. It is possible to obtain a rotor 1 in which the portions 5 have different combinations of magnetic properties.

Figure 3 shows rotors A, B, and C punched out of the magnetically anisotropic material shown in Figure 1, and heat-treated in each punching direction at a temperature that provides each coercive force. , A and B punched into a two-pole bear coil type Warren motor, respectively.
This figure shows the motor characteristics when several sheets of C and C are assembled separately.

The horizontal axis represents the holding force, and the vertical axis represents the starting voltage and starting torque.
The directions A, B, and C of the rotor's central feed passage with respect to the rolling direction are shown as parameters, and the coercive force value in FIG. 3 indicates the coercive force in the rotor's punching direction.

FIG. 4 shows the relationship between the heat treatment temperature and magnetism (coercive force, residual magnetic flux density) in each direction of A, B, and C with respect to the rolling direction of the Fe--Mn semi-hard magnet used in the present invention. The starting voltage is the voltage at which the rotor starts rotating with no load, and the starting torque is the maximum load at which the rotor starts rotating when a 100V voltage is applied. In FIG. 3, A shows the characteristics when a conventional rotor made of a material having isotropic magnetic characteristics is used in the electric motor.

For the rotors manufactured by the present invention in each punching direction, the starting voltage gradually increases as the coercive force increases, and the starting torque value decreases in the order of B, C, and A, and the maximum starting torque value decreases in the order of B, C, and A. The obtained coercive force level is higher in the order of C, B, and A, and the starting voltage at that time is lower in B and C than in A. The desired characteristics of a Warren type synchronous motor are low starting voltage and high starting torque.Judging from this point, B has the lowest starting voltage and the highest starting torque, followed by C, which has better characteristics than A. It can be seen that it has.

Comparing the characteristics of a motor between a rotor punched out of a material with magnetic anisotropy with the central passage direction changed and a rotor made of a conventional isotropic material, we find that the magnetic anisotropy An electric motor with a rotor punched so that the direction of the central magnetic path is perpendicular to the rolling direction and 45 degrees to the rolling direction can obtain high starting torque with a low starting voltage, and its characteristics are as follows. Get better.

In the present invention, a rotor having shape anisotropy was punched out in different directions was tested, and results were always obtained over several times in which the characteristics of the motor varied depending on the direction. Although this is not theoretically clear, it is thought that this is because the material has magnetic anisotropy, so that the combination of magnetic properties of the central magnetic path section and the annular magnetic path section differs depending on the punching direction. As described above, according to the manufacturing method of the present invention, the magnetic anisotropy of the material and the shape anisotropy of the rotor can be easily and appropriately combined, and the rotor using the conventional isotropic material can be easily and appropriately combined. The various characteristics of the electric motor, particularly the starting torque and starting voltage, can be improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing different punching directions according to the present invention;
FIG. 2 is a plan view showing the stator and rotor of a Warren-type synchronous motor, and FIG. 3 is a characteristic diagram of a Warren-type synchronous motor incorporating the rotor according to the present invention. FIG. 4 is a diagram showing the relationship between the rolling direction of the material and the magnetic properties. 1: rotor, 5: annular magnetic path section, 6: central magnetic path section. Spear' 2 diagrams outside the diagram (Kizu Zuto

Claims (1)

[Claims] 1. In a method for manufacturing a shape-anisotropic rotor consisting of an annular magnetic path section and a central magnetic path section, the central magnetic path section is rotated at different angles with respect to the rolling direction using a material having rolling magnetic anisotropy. A method for manufacturing a Warren-type synchronous rotor, which is characterized by punching out a child body.