Variable magnetic flux motor drive system

A magnetic flux motor and driver technology, which is applied in the direction of motor generator control, electromechanical brake control, AC motor control, etc., can solve the problems of increased capacity of switching elements, increased current capacity of switching elements, and increased costs, so as to prevent the application of Effects of braking force, suppression of deterioration of torque accuracy, and improvement of efficiency

Active Publication Date: 2009-07-22
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if an excessive current is required, not only the current capacity of the switching elements of the inverter increases, but also the withstand voltage of the switching elements of the inverter must be increased.
Therefore, the capacity of the switching element increases only for the magnetization process, resulting in an increase in cost

Method used

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  • Variable magnetic flux motor drive system

Examples

Experimental program
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Effect test

no. 1 approach

[0098] figure 1 It is a block diagram of the variable magnetic flux motor drive system of 1st Embodiment of this invention. First, the main circuit including the variable magnetic flux motor 4 of the drive system will be described. Inverter 1 converts DC power from a DC power supply into AC power and supplies it to variable magnetic flux motor 4 . Currents Iu and Iw supplied to variable magnetic flux motor 4 are detected by current detector 2 and converted into D-axis current Id and Q-axis current Iq by coordinate conversion unit 7 and input to voltage command calculation unit 10 . The D-axis voltage command Vd from the voltage command calculation unit 10 ＊ , Q-axis voltage command Vq ＊ is input to the coordinate converter 5 and converted into a three-phase voltage command Vu ＊ 、Vv ＊ 、Vw ＊ Then input to PWM circuit 6. The PWM circuit 6 controls the switching elements of the inverter 1 to be turned on and off using the gate command Gst from the gate command generator 15...

no. 2 approach

[0176] Figure 10 It is a block diagram of the variable magnetic flux motor drive system of 2nd Embodiment of this invention. In this second embodiment, relatively figure 1 In the first embodiment shown, the magnetization request generation unit 29 generates the front-stage magnetization request flag FCReq 0 output to the torque command generation unit 38 instead of the magnetization request flag FCReq output to the variable magnetic flux control unit 13, and the torque command generation unit 38 In addition to the torque permission flag TrqON, also input the previous stage magnetization request flag FCReq 0 and the magnetization completion flag FCCmp, in addition to the torque command Tm ＊ In addition, a magnetization request flag FCReq is also generated. That is, the torque command generator 38 generates a torque command Tm that reduces the torque when the variable magnet is magnetized. ＊ , and outputs the magnetization request flag FCReq to the variable magnetic flux co...

no. 3 approach

[0187] Figure 13 It is a block diagram of the variable magnetic flux motor drive system of 3rd Embodiment of this invention. In this third embodiment, relatively figure 1 In the first embodiment shown, a modulation rate calculation unit 61 and a field weakening control unit 62 are additionally provided, and an output signal of the field weakening control unit 62 is input to the magnetization request generation unit 29 . Thus, the magnetization request generator 29 generates a magnetization request according to the modulation factor of the inverter 1 . right with figure 1 The same reference numerals are attached to the same elements, and repeated explanations are omitted.

[0188] exist Figure 13 Among them, the DC-side voltage Vdc of the inverter 1 is detected by the DC voltage detector 60 and input to the modulation factor computing unit 61 . The DQ-axis voltage command Vd, which is the output of the voltage command calculation unit 10, is also input to the modulatio...

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Abstract

The present invention provides a variable-flux motor drive system including a permanent-magnet motor 4 having a permanent magnet, an inverter 1 to drive the permanent-magnet motor, and a magnetize means to pass a magnetizing current for controlling the flux of the permanent magnet. The permanent magnet is a variable magnet whose flux density is variable depending on a magnetizing current from the inverter 1. The magnetize means passes a magnetizing current that is over a magnetization saturation zone of magnetic material of the variable magnet. This system improves a flux repeatability of the variable magnet 53 and a torque accuracy.

Description

technical field [0001] The present invention relates to variable flux motor drive systems. Background technique [0002] In place of the conventional induction motor (IM motor), permanent magnet synchronous motors (PM motors) that are excellent in efficiency and can be expected to be smaller and lower in noise have begun to spread. For example, PM motors are used as drive motors for railway vehicles or electric vehicles. [0003] Since the IM motor generates magnetic flux itself by using the field current from the stator, there is a technical problem of loss due to the flow of the field current. [0004] On the other hand, a PM motor is a motor that has permanent magnets in its rotor and outputs torque using its magnetic flux, so it does not have the problems that such an IM motor has. However, PM motors generate induced voltages corresponding to the rotational speed due to their permanent magnets. In applications with a wide rotation range such as railway vehicles and au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P6/08H02P27/04H02K1/27H02P6/06H02P6/17H02P21/02H02P21/13H02P23/02H02P27/08
CPCY02T10/643Y02T10/7241Y02T10/644Y02T10/641
Inventor 结城和明堺和人饼川宏
Owner KK TOSHIBA
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