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Motor driving device

A technology of motor drive and mechanical braking, which is applied in the direction of deceleration device of AC motor, motor control, output power conversion device, etc., can solve problems such as equipment failure, and achieve the effect of shortening the conduction time

Active Publication Date: 2019-07-16
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, equipment used in areas where the power supply voltage is likely to fluctuate may cause equipment failure regardless of the countermeasures against voltage rise.

Method used

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  • Motor driving device
  • Motor driving device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0076] (1) Summary

[0077] figure 1 It is a block diagram showing the overall configuration of a system 100 using the motor drive device 10 according to the first embodiment of the present invention and the internal configuration of the motor drive device 10 . figure 1 Among them, the system 100 is composed of a motor drive device 10 and a motor 51 .

[0078] (1-1) Motor 51

[0079] The motor 51 is a three-phase brushless DC motor and has a stator 52 and a rotor 53 . The stator 52 includes star-connected U-phase, V-phase, and W-phase drive coils Lu, Lv, and Lw. One end of each drive coil Lu, Lv, and Lw is connected to drive coil terminals TU, TV, and TW of the respective U-phase, V-phase, and W-phase wirings extending from the inverter 25 . The other ends of the drive coils Lu, Lv, and Lw are connected to each other as terminals TN. These three-phase drive coils Lu, Lv, and Lw are rotated by the rotor 53 to generate induced voltages corresponding to the rotation speed an...

no. 2 Embodiment approach

[0131] (1) Summary

[0132] image 3 It is a block diagram showing the overall configuration of a system 100 using the motor drive device 10 according to the second embodiment of the present invention and the internal configuration of the motor drive device 10 .

[0133] image 3 In the motor drive device 10 of the second embodiment, a resistive load 71 and a relay circuit 73 are provided instead of figure 1 The brake circuit 61 in the first embodiment is shown. Therefore, here, the resistive load 71 and the relay circuit 73 will be described, and since the other elements are the same as those of the first embodiment (configuration other than the brake circuit 61), the same names and numerals will be given, and A detailed description thereof is omitted.

[0134] (2) Detailed structure of the motor drive device 10

[0135] (2-1) Resistance load 71

[0136] image 3 Among them, the resistive load 71 is composed of three resistive elements 71u, 71v, and 71w. The resistanc...

no. 3 Embodiment approach

[0149] (1) Summary

[0150] Figure 4 It is a block diagram showing the overall configuration of a system 100 using the motor drive device 10 according to the third embodiment of the present invention and the internal configuration of the motor drive device 10 .

[0151] Figure 4 In the motor drive device 10 of the third embodiment, in the figure 1 In the structure in which the electric brake circuit 61 is removed in the first embodiment shown in , a mechanical brake 81 detachable from the output shaft of the motor 51 is newly provided. Therefore, here, the brake 81 will be described, and since the other elements are the same as those of the first embodiment (configuration other than the brake circuit 61), the same names and symbols will be used, and detailed descriptions will be omitted. .

[0152] (2) Structure of the motor drive device 10

[0153] The brake 81 is a mechanical brake and is composed of an electromagnetic clutch 83 and a load 85 , wherein the load 85 is ...

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Abstract

The present invention addresses the problem of providing a motor driving device equipped with a compact and low-cost overvoltage protection means that protects the device from momentary overvoltages.In this motor driving device (10), when an overvoltage occurs the overvoltage is divided between the ends of two series-connected transistors by turning off the transistors (Q3a-Q5b) of both the upperand lower arms, thereby reducing the overvoltage applied to any one of the transistors to one-half of the value if only one were operating, so the transistor can be protected from damage. Furthermore, it is highly likely that switching elements (diodes (D3a-D5b)) will be turned on by the energy of the inductance component of the motor (51) and the induced voltage of the motor (51), but by electrically braking and quickly stopping the motor (51) after the transistors of both the upper and lower arms have turned off, it is possible to minimize the amount of time the switching elements (the diodes) are on.

Description

[0001] This application is a divisional application of an invention patent application with application number 201480070191.7 (international application number: PCT / JP2014 / 084110, filing date: December 24, 2014, invention name: motor drive device). technical field [0002] The invention relates to motor drives. Background technique [0003] In a device that rectifies an AC voltage to obtain a DC voltage, the DC voltage fluctuates according to the AC voltage. In particular, equipment used in areas where power supply voltage is likely to fluctuate may cause failure of the equipment no matter how the countermeasures are taken when the voltage rises. Therefore, an overvoltage protection unit as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2007-166815 ) is provided. The overvoltage protection unit uses the input transformer as a transformer with on-load tap changer (load time tap changer), and when the voltage above the threshold is input to the inverter for mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/024H02P3/22H02M1/32H02M7/48
CPCH02M7/48H02P3/22H02M1/32H02P29/0241
Inventor 佐藤俊彰矢吹俊生田口泰贵畑山敬之
Owner DAIKIN IND LTD