Motor Control Device
A control device and motor technology, applied in motor control, electronic reversing motor control, single motor speed/torque control, etc., can solve the problem of damage to the switching element of the inverter 12, disconnection of the power circuit breaker, and cut-off of the power fuse And other issues
Active Publication Date: 2012-04-25
三电株式会社
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[0012] However, since the overcurrent protection function performed by the rotation control unit 15 of the above-mentioned motor control device is based on the normal operation of the overcurrent detection unit 18, when an abnormality such as a failure occurs in the overcurrent detection unit 18, even if an overcurrent occurs Also, the overcurrent protection function cannot be performed, and due to the overcurrent, many problems such as damage to the switching element of the inverter 12 or cutoff of the power supply fuse or disconnection of the power supply circuit breaker may occur.
[0013] In addition, even when the above-mentioned many problems occur due to the abnormality of the overcurrent detection part 18, it takes a long time to find out the cause, and even after the cause is found out, it is necessary to resume the processing of various problems. time consuming and costly
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[0030] figure 2 It is a figure which shows the motor control apparatus of this invention, 11 in a figure is a motor, 12 is an inverter, 13 is a DC power supply, and 14 is a controller with built-in microcomputer. The controller 14 includes a rotation control unit 15 , an inverter control unit 16 , a phase current detection unit 17 , an overcurrent detection unit 18 , and an overcurrent inspection unit 19 .
[0031] figure 2 The motor control unit shown with the figure 1 The structure of the shown existing motor control device differs in that:
[0032] - Equipped with an overcurrent inspection unit 19 for diagnosing an abnormality in the overcurrent detection unit 18
[0033] · It has a function of diagnosing the abnormality of the overcurrent detection part 18 by the overcurrent detection part 19.
[0034] Due to other figure 1 The conventional motor control devices shown are the same, so the same reference numerals are used, and descriptions thereof are omitted.
[00...
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To provide a motor control device that can diagnose an abnormality in overcurrent detection means and can previously avoid various problems caused by the abnormality MEANS FOR SOLVING THE PROBLEMS The motor control device has an overcurrent test unit 19 to send a first test voltage Vt1 lower than a reference voltage Vref for overcurrent determination and a second test voltage Vt2 not lower than the reference voltage Vref to an overcurrent determination unit 18 when a synchronous motor 11 is not rotated. The motor control device determine that an abnormality occurs in the overcurrent detection unit 18 when the overcurrent determination unit 18 determines that the first test voltage Vt1 from the overcurrent test unit 19 causes no overcurrent on the basis of a comparison result, or when the overcurrent determination unit 18 determines that the second test voltage Vt2 from the overcurrent test unit 19 causes an overcurrent on the basis of a comparison result.
Description
technical field [0001] The present invention relates to a motor control device including an overcurrent detection unit for an inverter. Background technique [0002] figure 1 The structure of this conventional motor control device is shown, 11 in a drawing is a motor, 12 is an inverter, 13 is a DC power supply, and 14 is a controller with a built-in microcomputer. The controller 14 includes a rotation control unit 15 , an inverter drive unit 16 , a phase current detection unit 17 , and an overcurrent detection unit 18 . [0003] The motor 11 is constituted by a three-phase direct current (DC) brushless motor, and includes a stator (not shown in the figure) including three-phase coils (U-phase coil Uc, V-phase coil Vc, and W-phase coil Wc), and a rotor (not shown) including permanent magnets. omitted in the figure). The U-phase coil Uc, the V-phase coil Vc, and the W-phase coil Wc are connected in a star shape or in a delta shape around a neutral point N as shown in the fi...
Claims
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IPC IPC(8): H02P6/12H02M1/32H02P6/18H02M7/48H02P6/06H02P6/08H02P6/182H02P6/28
CPCH02P29/021H02M7/53875H02P6/182H02H7/1225H02P29/027H02M1/32H02P6/12H02H7/0805H02P29/0241
Inventor 广野大辅
Owner 三电株式会社