阅读说明：本技术 电机控制装置以及空调机 (Motor control assembly and air conditioner ) 是由 植村启介 高桥健治 和田康彦 津村晃弘 于 2017-04-27 设计创作，主要内容包括：电机控制装置(100)具备：逆变器(4),包括多个支路(4a)；平滑单元(3),对逆变器(4)供给直流电压；分流电阻(7u、7v、7w),被插入于逆变器(4)的各相下支路的开关元件与平滑装置(3)的负极侧之间；主电机电流传感器(9),输出与在并联连接于逆变器(4)的第一电机(51)中流过的电流对应的电压；以及运算器(6),基于主电机电流传感器(9)的输出和与分流电阻(7u、7v、7w)的电压降对应的输出而生成对多个开关元件的驱动信号。(Motor control assembly (100) has: inverter (4), including multiple branches (4a)；Smooth unit (3) supplies DC voltage to inverter (4)；Shunt resistance (7u, 7v, 7w) is inserted under each phase of inverter (4) between the switch element of branch and the negative side of smoothing apparatus (3)；Main motor current sensor (9) exports voltage corresponding with the electric current flowed through in the first motor (51) for being connected in parallel in inverter (4)；And arithmetic unit (6), output and output corresponding with the voltage drop of shunt resistance (7u, 7v, 7w) based on Main motor current sensor (9) and generate to the driving signal of multiple switch element.)

1. a kind of motor control assembly, has:

Inverter, including multiple branches；

DC power supply supplies DC voltage to the inverter；

Shunt resistance, be inserted into the switch element of branch and the DC power supply under each phase of the inverter negative side it Between；

Current sensor, output and the electric current flowed through in the n-1 platform motor in the n platform motor for being connected in parallel in the inverter Corresponding voltage；And

Arithmetic unit, output and output corresponding with the voltage drop of the shunt resistance based on the current sensor, generation pair The driving signal of multiple switch elements, wherein

The n is 2 or more integer.

2. motor control assembly according to claim 1, wherein have:

Inverter overcurrent test section carries out overcurrent detection according to the voltage drop of the shunt resistance；And

Motor overcurrent test section carries out overcurrent detection according to the output voltage of the current sensor.

3. motor control assembly according to claim 2, wherein have:

N-2 relay, be inserted into n-2 platform motor in the n-1 platform motor for being provided with the current sensor with it is described inverse Become between device；And

Relay is inserted into and is not connected with having between the motor of the current sensor and the inverter.

4. motor control assembly according to claim 1 or 2, wherein

The arithmetic unit calculates the inverter electricity flowed through in the inverter according to voltage value corresponding with the shunt resistance Stream, and the current sensor is being connected with according to voltage value corresponding with the output voltage of current sensor calculating The current of electric flowed through in motor, by subtracting the current of electric from the inverter current, come calculate it is not connected have it is described The electric current of the motor of current sensor and generate the driving signal.

5. motor control assembly described in any one of claim 1 to 3, wherein

The current of electric is subtracted and calculated electric current according to from the inverter current, carries out not connected having the electric current to pass The overcurrent of the motor of sensor detects.

6. a kind of air conditioner has motor control assembly according to any one of claims 1 to 5.

Technical field

The present invention relates to the motor control assembly for the driving for controlling multiple motors and equipped with by the motor control assembly The air conditioner of the motor of control.

Background technique

For the revolving speed of permanent magnet synchronous motor (hreinafter referred to as " PM (Permanent Magnet, permanent magnet) motor ") With the control of position, usually used inverter.This is because needing to apply the alternating current with the permanent-magnet synchronous of rotor to motor Pressure.Therefore, when controlling PM motor, for 1 PM motor, 1 inverter is basic structure.As a result, when being set in air conditioner In the case where being equipped with multiple motors, become desirable for inverter corresponding with the number of units of motor, become air conditioner enlargement with And the main reason for cost increase.

Under above-mentioned technical background, although the technical task to be solved is different, the following patent document 1 discloses A kind of electric device and driving method, wherein driving 1 induction conductivity using 1 inverter (hereinafter referred to as " IM (Induction Motor, induction conductivity) ") and 1 PM motor.

Summary of the invention

Technical task to be solved by this invention

According to above patent document 1, it is configured to control PM motor using rotation sensor to PM motor.It needs to PM electricity Machine uses position sensor.Therefore, the device equipped with PM motor is enlarged and cost is got higher.In addition, such as air conditioner In the case that outdoor unit is set to outdoor purposes like that, therefore, to assure that waterproofness.Therefore, motor itself enlargement and cost It gets higher.

On the other hand, there is also the control modes of non-use position sensor.The control mode of non-use position sensor Commonly known as " position Sensorless Control ".Position Sensorless Control is that position is not carried in motor as its title It sets sensor and speculates the control mode of the rotation position of motor according to current of electric.Either PM motor and IM, can Use position Sensorless Control.

In position Sensorless Control, need to detect the current sensor of current of electric.It is controlled using 1 inverter In the case where making multiple motors, it usually needs setting current sensor corresponding with the number of units of motor.Illustrated with specific example, When with 1 inverter control, two PM motors, two groups of current sensors are needed.In particular, the case where controlling three-phase motor Under, due to needing to detect the electric current of amount corresponding at least two, so needing 2 × 2=4 current sensor.Common electricity Flow sensor is expensive.Therefore, in the position Sensorless Control of the device equipped with three-phase motor, installation cost becomes It is high.

The present invention makes in view of the above problems, its object is to obtain a kind of motor control assembly, is applying nothing It, being capable of the realization while enlargement of avoiding device and cost are got higher when position sensor controls.

Solve the technical solution of technical task

In order to solve above-mentioned technical task and reach purpose, motor control assembly of the invention has: inverter, including more A branch (arm)；DC power supply supplies DC voltage to inverter；Shunt resistance is inserted into branch under each phase of inverter Switch element and DC power supply negative side between；Current sensor exports and in the n platform motor for being connected in parallel in inverter In n-1 platform motor in the corresponding voltage of electric current that flows through；And arithmetic unit, output based on current sensor and with shunt electricity The corresponding output of the voltage drop of resistance generates the driving signal to multiple switch element.Wherein, n is 2 or more integer.

Invention effect

According to the present invention, following effect is played: when to motor control assembly application position Sensorless Control, Neng Gou The realization while enlargement of avoiding device and cost are got higher.

Detailed description of the invention

Fig. 1 is the figure for showing the structural example of air conditioner of embodiment 1.

Fig. 2 is the structural example for showing the motor control assembly for being set to indoor unit and its peripheral circuit of embodiment 1 Figure.

Fig. 3 is the block diagram for showing an example of the hardware configuration of function for the arithmetic unit for realizing Fig. 2.

Fig. 4 is the block diagram of the structural example of the motor control operation constructed in the arithmetic unit for show Fig. 2.

Fig. 5 be show main motor (master-motor) dq shaft current with from motor (slave-motor) dq shaft current Between generate axis error when state of a control figure.

Fig. 6 is the flow chart for showing the process of the overcurrent detection by the arithmetic unit implementation of Fig. 2.

Fig. 7 is the structural example for showing the motor control assembly for being set to indoor unit and its peripheral circuit of embodiment 2 Figure.

Fig. 8 is the flow chart for showing the workflow of the relay in embodiment 2.

Appended drawing reference

1 AC power source, 2 rectifiers, 3 smooth units, 4 inverters, 4a branch, 6 arithmetic units, 7 inverter current sensors, 7_u、7_v、7_wShunt resistance, 8 busbar voltage sensors, 9 Main motor current sensors, 13 relays, 14 power lines, 15 bifurcation points, 16,17 level displacement circuits (level-shift circuit), 18 inverter overcurrent sensing circuits, 19 main motor overcurrent Detection circuit, 40 indoor units, 51 first motors, 52 second motors, 55 indoor heat exchangers, the piping of 58 gas refrigerants, 59 liquid Cryogen piping, 63 main motor vector control units, 64,611,612 coordinate converting sections, 65PWM signal generation portion, 66 pulsation are mended Repay control unit, 80 outdoor units, 81 compressors, 82 four-way valves, 84 liquid storage devices, 85 outdoor machine fans, 86 outdoor heat exchangers, 87 sections Stream device, 100 motor control assemblies, 200CPU, 202 memories, 204 interfaces, 614 difference engines, 621 main motor estimating units, 622 From motor estimating unit, 623,624 integrators.

Specific embodiment

Hereinafter, being described in detail based on motor control assembly and air conditioner of the attached drawing to embodiments of the present invention.Separately Outside, the present invention is not limited by following implementation.