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Rotating electric machine system, driving device for rotating electric machine, driving method thereof, and vehicle

A technology of rotating electrical machines and voltages, which is applied in the direction of electric devices, electric vehicles, battery/battery traction, etc. It can solve the problems of inability to reduce the magnetic flux density and obtain sufficient effects, and achieve the effect of suppressing the reduction of output

Active Publication Date: 2020-08-07
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, permanent magnets with high magnetic flux density such as Nd-Fe-B sintered magnets cannot sufficiently reduce the magnetic flux density during high-speed rotation.
[0006] As such, in a rotating electrical machine using permanent magnets with a high magnetic flux density, sufficient effects cannot be obtained even if the field weakening control method is used during high-speed rotation

Method used

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  • Rotating electric machine system, driving device for rotating electric machine, driving method thereof, and vehicle
  • Rotating electric machine system, driving device for rotating electric machine, driving method thereof, and vehicle
  • Rotating electric machine system, driving device for rotating electric machine, driving method thereof, and vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、 Embodiment 2

[0122] After weighing and mixing the raw materials used in the permanent magnet at a certain ratio, arc melting is performed in an Ar atmosphere to produce an alloy ingot. The above-mentioned alloy ingot was kept at 1160° C. for 19 hours for heat treatment, and then the alloy ingot was coarsely pulverized and pulverized by a jet mill to prepare alloy powder as the raw material powder of the magnet. The obtained alloy powder is press-molded in a magnetic field to produce a compression molded body.

[0123] Then, as shown in Table 2, the compression molded body was left at a humidity of 30% and a temperature of 23°C for a period of 2.5 hours to perform oxidation treatment. Furthermore, the compression molded body of alloy powder is placed in the sintering furnace chamber, the chamber is kept in a vacuum state, and then the temperature is raised to 1175°C, and the temperature is maintained for 30 minutes, after which Ar gas is introduced, and the temperature is raised to 1200 in an ...

Embodiment 3、 Embodiment 4、 Embodiment 5

[0128] After the raw materials are weighed and mixed in a prescribed ratio, they are melted by high-frequency induction in an Ar atmosphere to produce alloy ingots. After the alloy ingot was coarsely pulverized, it was heat-treated at 1160°C for 2 hours, and then cooled to room temperature by rapid cooling. Then, coarse pulverization and pulverization with a jet mill are used to prepare alloy powder as the raw material powder of the magnet. Then, the alloy powder is press-molded in a magnetic field to produce a compression molded body.

[0129] Then, as shown in Table 2, the compression molded body was left at a humidity of 36% and a temperature of 18°C ​​for a period of 20 hours to perform oxidation treatment. Next, the compression molded body of alloy powder is placed in the chamber of the sintering furnace, the chamber is set to a vacuum state of 8.8×10-3Pa, and then the temperature is raised to 1175°C, and the temperature is maintained for 60 minutes, and then Ar is introduc...

Embodiment 6、 Embodiment 7

[0133] After the raw materials are weighed and mixed in a specific ratio, high-frequency induction melting is performed in an Ar atmosphere to produce an alloy ingot. After the alloy ingot was coarsely pulverized, it was heat-treated at 1170°C for 10 hours, and then cooled to room temperature by rapid cooling. Then, coarse pulverization and pulverization with a jet mill are used to prepare alloy powder as the raw material powder of the magnet. Then, the alloy powder is press-molded in a magnetic field to produce a compression molded body.

[0134] Then, as shown in Table 2, the compression molded body was left at a humidity of 24% and a temperature of 28° C. for a period of 12 hours to perform oxidation treatment. Next, the compression molded body is placed in the chamber of the sintering furnace, the chamber is set to a vacuum state of 7.5×10-3Pa, and then the temperature is raised to 1165°C, and the temperature is maintained for 10 minutes, and then Ar gas is introduced into t...

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Abstract

In the system according to the embodiment, the rotating electrical machine is a permanent magnet type rotating electrical machine in which the magnetic poles of the rotor are formed using permanent magnets. The inverter generates AC voltage through switches, and outputs it to the rotating electric machine as driving power. The control device detects the excitation component current in the rotating electric machine, estimates the rotor speed of the rotating electric machine based on the detected current, obtains the exciting component voltage in the rotating electric machine based on the difference between the estimated rotor speed and the target speed, and controls the The inverter switches so that the rotor speed follows the target speed. The permanent magnet is an R-Co type (R is at least one element selected from rare earth elements) permanent magnet containing 25 to 40 atomic % of iron. In addition, the control device increases or decreases the field component voltage based on the negative field component current characteristic corresponding to the rotor speed of the permanent magnet raw material to perform field weakening control.

Description

Technical field [0001] The present embodiment relates to a permanent magnet type rotating electric machine system, a driving device of the rotating electric machine, a driving method thereof, and a vehicle. Background technique [0002] Motors and generators of automobiles, railway vehicles, etc. use permanent magnet type rotating electrical machines, and Nd-Fe-B type magnets are used in order to improve the efficiency of the permanent magnets. The Nd-Fe-B type magnet has a higher magnetic flux density, and therefore, a higher torque can be obtained by using the Nd-Fe-B type sintered magnet in a rotating machine. [0003] The motors used in the above-mentioned automobiles or railway vehicles can perform variable-speed drive from low-speed rotation to high-speed rotation. In contrast, the conventional motor using Nd-Fe-B based sintered magnets can obtain high torque on the low-speed rotation side, but generates an induced voltage (back electromotive force) on the high-speed rotatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/02H02P6/18H02P23/00B60L50/51
CPCB60L2210/42B60L2220/16B60L50/51H02K1/02H02P6/18H02P23/009Y02T10/64Y02T10/70Y02T10/72
Inventor 堀内阳介樱田新哉
Owner KK TOSHIBA