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Motor driving device

A motor drive and control device technology, applied in the direction of starting devices, measuring devices, motor control, etc., can solve problems such as complex calculations, easy loss of synchronization, and out of step

Inactive Publication Date: 2007-03-21
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the above-mentioned existing devices, in order to estimate the position of the rotor, it is necessary to grasp the motor constant, circuit parameters or motor load in advance, and to detect the error between the prescribed calculation value and the current measurement value; It needs to be calculated by a processor, so the calculation becomes very complicated, and a processor with high-speed and high-performance computing functions is required
In addition, when the motor load changes greatly, there is also the problem that it is easy to lose synchronization (that is, out of step).

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Fig. 1 is a block diagram of a motor drive device in the first embodiment. In FIG. 1 , AC power supply 1 adds AC power to rectifier circuit 2 and converts it into DC power. Such DC power is then converted into 3-phase AC power by inverter circuit 3 to drive motor 4 . Capacitors 21a, 21b are connected in series between the DC output terminals of the full-wave rectifying circuit 20 in the rectifying circuit 2, and the connection point between the capacitors 21a, 21b is connected with an input terminal of the AC power supply to form a DC voltage doubler circuit to improve The voltage applied to the inverter circuit 3.

[0036] The negative voltage side of the inverter circuit 3 is connected with a current detection device 5. By detecting the current flowing in the lower arms of the three phases of the inverter circuit 3, the output current of the inverter circuit 3, that is, the current of each phase of the motor 4 to test.

[0037] The control device 6 calculates the ou...

Embodiment 2

[0089] The second aspect of the present invention will be described below using Fig. 12, Fig. 13, Fig. 14 and Fig. 15.

[0090] Example.

[0091] Fig. 12 is a cross-sectional view of the motor drive device of the dishwasher in the second embodiment of the present invention, where the water pump and the motor adopt a single-motor-single-water-pump mode.

[0092] Wherein, tap water is added in the cleaning tank 7 from the water inlet valve 8, and the cleaning water 9 is accumulated in the cleaning tank 7. The bottom of the cleaning tank 7 is provided with a flat DC brushless motor 4a, the rotation axis of which is in the vertical direction, and the bottom of the motor 4a is provided with a water pump housing 10 . By rotating the impeller 11, a pressure is applied to the water in a centrifugal direction from the axis of rotation.

[0093] When the impeller 11 rotates in the forward direction, the washing water is sprayed from the spraying wings 12b provided with the spraying no...

Embodiment 3

[0110] Fig. 17 is a block diagram of the control device of the motor drive device in the third embodiment. The control device controls the reactive current Isinφ after detecting the motor torque, so as to maximize the working efficiency.

[0111] FIG. 17 is a partial improvement of the block diagram shown in FIG. 13 in the second embodiment, so only the improved part will be described below. Wherein, the output electric power calculation device 77 of the frequency converter calculates the output electric power of the frequency converter, that is, the input power of the motor from the output voltage Va of the frequency converter and the effective current Ia, and the input signal of the motor and the driving frequency signal are added to the torque current calculation device 79 On, and then according to the formula 6 to find the motor torque current Iq.

[0112] Active current calculation device 80 obtains motor current vector absolute value Im from formula 2, and motor current ...

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Abstract

The present invention provides a motor drive device to detect a motor load state in simplified sensor-less sine wave drive. AC power 1 is converted into DC power by a rectifying circuit 2, a motor 4 is driven by an inverter circuit 3, an output current of the inverter circuit 3 is detected by a current detection means 5, a reactive current is controlled so as to reach a prescribed value in the set number of revolutions, and the load state is discriminated by an output voltage of the inverter circuit or output power.

Description

technical field [0001] The invention relates to a motor drive device for sensorless sine wave drive. Background technique [0002] In this existing motor drive device, by eliminating the rotor position sensor and performing sensorless sine wave drive, the vibration and noise of the motor can be reduced, and the reliability can be improved (for an example, refer to Japanese Patent Publication No. 2000-350489 ). [0003] However, in the above-mentioned existing devices, in order to estimate the position of the rotor, it is necessary to grasp the motor constant, circuit parameters or motor load in advance, and to detect the error between the prescribed calculation value and the current measurement value; The calculation needs to be performed by a processor, so the calculation becomes very complicated, and a processor with a high-speed and high-performance calculation function is required. In addition, when the motor load changes greatly, there is also the problem of easy loss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06H02P6/18H02P6/06H02P6/08H02P6/182H02P6/28
CPCG01R31/343H02P6/085H02P6/18H02P6/20H02P21/24H02P2209/11
Inventor 木内光幸铃木将大中田秀树吉冈包晴
Owner PANASONIC CORP
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