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Synchronous motor drives and equipment with a refrigeration cycle having the same

A technology of synchronous motor and driving device, which is applied in motor control, AC motor control, electronic commutation motor control, etc. It can solve the problems of inability to detect input AC current, complex inverter circuit structure, and consumption of compressors, etc.

Inactive Publication Date: 2016-08-17
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, an integrating circuit is required, and the structure of the inverter circuit becomes complicated
Moreover, the input AC current of the air conditioner is not only consumed by the compressor, but also by the heat loss of the fan motor and other power module parts, etc.
The structure of Patent Document 1 cannot detect the input AC current caused by these

Method used

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  • Synchronous motor drives and equipment with a refrigeration cycle having the same
  • Synchronous motor drives and equipment with a refrigeration cycle having the same
  • Synchronous motor drives and equipment with a refrigeration cycle having the same

Examples

Experimental program
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Effect test

Embodiment approach 1

[0038] refer to figure 1 , the configuration and operation of the synchronous motor drive device MD1 in Embodiment 1 of the present invention will be described.

[0039] The synchronous motor drive device MD1 is composed of a converter circuit 2, an inverter circuit 3, a current detection resistor (shunt resistor) R1, a current detection circuit 5, and a microcomputer A1.

[0040] Converter circuit 2 converts input AC power supplied from commercial AC power supply 1 with effective values ​​of AC voltage and AC current Vac and Iac, respectively, into DC voltage Vdc, and outputs it between positive DC line PL1 and negative DC line PL2. Inverter circuit 3 has three-phase (U-phase / V-phase / W-phase) inverters (Qu / Qx, Qv / Qy, Qw / Qz) connected between positive DC line PL1 and negative DC line PL2. Each of the three-phase inverters converts the DC voltage Vdc into a three-phase AC current (U phase / V phase / W phase), and supplies the synchronous motor 4 .

[0041] The microcomputer A1 g...

Embodiment approach 2

[0131] refer to Figure 8 , the configuration and operation of the synchronous motor drive device MD2 according to Embodiment 2 of the present invention will be described.

[0132] Figure 8 The synchronous motor drive device MD2 shown is composed of a converter circuit 2, an inverter circuit 3, a shunt resistor R1, a current detection circuit 53, and a microcomputer A3.

[0133] Converter circuit 2 converts input AC power supplied from commercial AC power supply 1 whose effective values ​​of AC voltage and AC current are Vac and Iac, respectively, into DC voltage Vdc, and outputs it between positive DC line PL1 and negative DC line PL2. Inverter circuit 3 has three-phase (U-phase / V-phase / W-phase) inverters (Qu / Qx, Qv / Qy, Qw / Qz) connected between positive DC line PL1 and negative DC line PL2. Each of the three-phase inverters converts the DC voltage Vdc into a three-phase AC current (U phase / V phase / W phase), and supplies the synchronous motor 4 .

[0134] The microcomputer...

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Abstract

The invention provides a synchronous motor driving device. In the synchronous motor driving device, the direct current (Idc) of the inverter circuit (3) having a 3-phase inverter is measured across a period of one mechanical revolution of the synchronous motor (4) by using a microcomputer (A1). , and calculate the instantaneous power of each inverter of the 3 phases. The effective power of the synchronous motor drive (MD1) is calculated from the instantaneous power of each inverter of the three phases, and the effective value of the commercial AC input current (Iac) is further estimated.

Description

technical field [0001] The present invention relates to a synchronous motor drive device and equipment including a refrigeration cycle having the same, and more particularly to a synchronous motor driving device and equipment including a refrigeration cycle having the same for supplying a three-phase alternating current generated by an inverter circuit to a synchronous motor. Background technique [0002] As an example, a synchronous motor drive for driving a synchronous motor is used in a facility having a refrigeration cycle consisting of a compressor, an evaporator, and a condenser. Examples of equipment having a refrigeration cycle include refrigerators and air conditioners (hereinafter also referred to as refrigeration and air conditioners). In refrigeration and air-conditioning devices, synchronous motors whose actions are controlled by synchronous motor drive devices are often used as compressors or fan motors. [0003] The synchronous motor drive device converts the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H02P27/06F24F11/02H02M7/48
CPCH02M7/53871H02P6/182H02P27/08H02P2205/03H02P2207/05H02M1/0009
Inventor 吉田充邦
Owner SHARP KK