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motor control unit

A technology of motor control and control unit, applied in the direction of AC motor control, emergency protection circuit device, control system, etc., can solve the problem of expensive devices and achieve the effect of simple structure

Active Publication Date: 2018-09-11
SANYO DENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, complex calculations such as three-phase to two-phase conversion and calculation of the normal phase part and the reverse phase part using complex coefficient filters are required
The setup used for the above calculations is expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0050] figure 1 It is a block diagram of the motor control device of Embodiment 1.

[0051] (Structure of motor control unit)

[0052] The motor control device 100 has a converter (converter) 114 and an inverter (inverter) 116 . The electromagnetic switch 112 is connected to the converter 114 .

[0053] The electromagnetic switch 112 is provided between the circuit 113 connecting the AC power source 110 and the converter 114 . The electromagnetic switch 112 has switch contacts corresponding to the respective phases. The circuit 113 is disconnected when the three switch contacts of the electromagnetic switch 112 are opened, and the circuit 113 is closed when the three switch contacts are closed. The three switch contacts are opened and closed simultaneously.

[0054] The converter 114 converts the three-phase AC from the AC power source 110 into DC through full-wave rectification. Converter 114 includes six diodes. A smoothing electrolytic capacitor 115 is connected to a...

Embodiment approach 2

[0087] image 3 It is a block diagram of the motor control device of Embodiment 2.

[0088] (Structure of motor control unit)

[0089] The motor control device 200 has a converter 214 and an inverter 216 . The converter 214 is connected to the electromagnetic switch 212 . The circuit 213 of each phase is connected to the AC reactor 211 .

[0090] Unlike converter 114 of Embodiment 1, converter 214 includes six semiconductor switches. The operation of converter 214 is controlled by converter control unit 243 .

[0091] AC power supply 210 , electromagnetic switch 212 , electrolytic capacitor 215 , inverter 216 , and motor 220 are the same as AC power supply 110 , electromagnetic switch 112 , electrolytic capacitor 115 , inverter 116 , and motor 120 in Embodiment 1.

[0092] In addition, the motor control device 200 includes a phase energization width detection unit 232 , a phase energization width calculation unit 235 , an unbalance rate calculation unit 236 , a first comp...

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PUM

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Abstract

The invention provides a motor control device which protects a converter when voltage is unbalance. The motor control device (100) comprises a converter (114) which converts alternating current from an AC power supply (110) to direct current, an inverter (116) which converts the direct current output by the converter (114) to alternating current and uses an AC drive motor (120), a communicated electric width detection portion (132) which detects communicated electric width of each phase of the AC power supply (110), a communicated electric width calculating portion (135) which calculates the maximum value or the minimum value of the communicated electric width and average value of the communicated electric width, and an unbalance rate calculating portion (136) which uses the maximum value or the minimum value of the communicated electric width to calculate unbalance rate of the AC power supply (110)

Description

technical field [0001] The present invention relates to a motor control device having a function of protecting a converter when voltage is unbalanced. Background technique [0002] In motor control units, a converter rectifies three-phase AC from a three-phase AC power supply to DC. An inverter converts the DC to AC again. [0003] The three-phase AC voltage input to the motor control device sometimes occurs due to the imbalance of the phase-to-phase or line-to-line impedance of the high-voltage power receiving and distribution equipment, and the load imbalance caused by the device connected to the single-phase power supply on the same three-phase power line. unbalanced. [0004] The converter consists of rectifying diodes. Therefore, when the current of a specific phase exceeds a predetermined current value due to the unbalanced three-phase AC voltage, the rectifying diode may be broken, or the life of the rectifying diode may be shortened. [0005] In order to suppress...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08H02P27/06
Inventor 井出勇治小山雅久山﨑悟史
Owner SANYO DENKI CO LTD