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Air-conditioning apparatus

A technology of an air conditioner and an inverter is applied to the control of a motor used in a compressor. It can solve the problems of increased motor loss, expensive circuits, etc.

Inactive Publication Date: 2006-05-10
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] When a high voltage is applied to the motor by the power conversion circuit, when it is desired to further increase the speed, it is necessary to form an expensive circuit
Especially it is difficult to attach expensive circuits to household air conditioners
In addition, in the case of using vector control for field weakening control, if the number of turns of the motor winding is increased, the field weakening control will be entered at a lower speed. When the negative d-axis current increases, the current flowing in the winding of the motor will increase. , there is the problem that the loss of the motor increases

Method used

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Embodiment Construction

[0032] Fig. 1 is a diagram showing an embodiment of a circuit configuration of a control device for an air conditioner motor according to the present invention. In the figure, symbol 1 is a commercial power supply, symbol 2 is a power factor improving reactor, symbol 3 is a rectifier diode, symbol 4 is a switch for a rectification circuit, symbols 5, 6, and 7 are smoothing capacitors, and symbol 8 is a current detection resistor , symbol 9 is an input current detection coil, symbol 10 is a rectifier diode, symbols 11 and 12 are AD converters, symbols 13, 14 and 15 are drivers, symbol 16 is an arithmetic processing device, symbol 17 is an AD converter, and symbol 18 is Synchronous motor (DC brushless motor), symbol 19 is a three-phase inverter bridge circuit, symbol 20 is a microcomputer, symbols 21, 22, 23, and 24 are resistors, symbol 25 is a comparator, and symbol 26 is a power supply zero-crossing detection Circuit, symbol 27 is a switching element, Vs is a commercial power...

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Abstract

PURPOSE: To provide an air-conditioner that has realized the control of a high efficiency in each operational condition when a motor is controlled from a low speed to a high speed. CONSTITUTION: A power conversion circuit having a function of boosting the DC voltage by converting the alternating current to the direct current and a motor control device having a weak magnetic flux control function by vector-control of a synchronous motor are employed in controlling the motor to drive a compressor for an air-conditioner. A means to boost the DC voltage in preference to the magnetic flux weakening control when increasing the number of rotation of the motor is selected. Therefore, the magnetic flux weakening control of degraded efficiency is not performed without reason.

Description

technical field [0001] The invention relates to an air conditioner, in particular to the control of a motor for a compressor. Background technique [0002] A general method for variable speed control of a permanent magnet synchronous motor is disclosed in, for example, Non-Patent Document 1 below. [0003] In order to increase the rotational speed of the motor, it is necessary to increase the frequency applied to the motor from the power converter and simultaneously increase the voltage. Since the induced voltage generated in the stator increases in proportion to the angular velocity of the rotor, it is necessary to apply a voltage higher than the induced voltage in order to cause a current to flow in the motor to generate torque. Therefore, for high-speed rotation, a power converter that generates a high voltage is required, but there are problems such as an increase in the cost of the power converter and generation of noise. [0004] On the other hand, there is field wea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00F24F11/02F24F11/46F24F11/61F24F11/62F24F11/86F24F11/88F24F11/89F24F140/00H02M7/12H02M7/48H02P6/06H02P6/08H02P6/28H02P21/22H02P23/20H02P27/04H02P27/08
CPCF25B49/025H02P21/00H02P2201/09
Inventor 高仓雄八川端幸雄能登原保夫高木純一加藤浩二須藤一弘田村建司船山裕治
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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