JPH0787786A - Motor controller - Google Patents

Abstract

PURPOSE:To obtain a motor controller which can suppress power consumption by performing rotary control according to starting pattern data selected according to the load of a motor from the activation start of the motor to normal operation. CONSTITUTION:When operation control is performed by the remote controller of an air conditioner, the data of indoor temperature and set temperature according to a remote controller are transmitted to a control part 10 of an outdoor machine following an operation command. Then, the control part 10 calculates the temperature difference between the indoor temperature and set temperature in cooling operation and then judges whether the difference is equal to or less than a specific value, reads the activation pattern data of a ROM part 9 based on the judgment result, and then determines the rotational acceleration pattern when starting a compressor motor 3. Then, when the difference between the indoor temperature and set temperature is extremely large, the rotational acceleration of the compressor motor 3 is rapidly increased after a specific time passes and rotational acceleration is increased somewhat gradually when the difference is small, thus suppressing power consumption on activation and at the same time improving the efficiency of the motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control device for optimizing power consumption by controlling the rotational acceleration of a motor such as an outdoor unit when starting an air conditioner controlled by an inverter.

[0002]

2. Description of the Related Art This motor control device is a compressor motor (sensorless DC) which constitutes a refrigeration cycle in order to control the indoor temperature with respect to the set temperature of the indoor unit when the compressor of an air conditioner is controlled by an inverter. It controls the rotation speed of brushless motors and AC motors (AC induction motors).

To this end, the motor control device, as shown in FIG. 4, for example, outputs an AC / DC converter 2 for converting a commercial AC power supply 1 to a DC power supply, and an output DC voltage of the AC / DC converter 2. An inverter circuit 4 for converting into alternating current and supplying it to the compressor motor 3, a rotor position detector 5 for detecting the position of the rotor of the compressor motor 3, an instruction from the indoor unit microcomputer 6, and a rotor. Control unit (outdoor unit microcomputer) 7 that outputs a drive signal for driving the compressor motor 3 according to the position detection signal, and a plurality of transistors of the inverter circuit 4 are turned on and off by the drive signal from the control unit 7. Inverter drive circuit 8
It has and. Although not shown, the indoor unit of the air conditioner includes a sensor that detects the indoor temperature.

Then, the indoor unit microcomputer 6 outputs a command (frequency command) for controlling the number of revolutions of the compressor motor 3 to the control unit 7 according to the temperature set by the remote controller and the indoor temperature, and the control unit 7 outputs the frequency. The drive is controlled by the command and the position detection signal of the rotor of the compressor motor 3, and the compressor motor 3 is normally operated. As a result, the indoor temperature is set to the set temperature, and the indoor environment is optimized.

[0005]

By the way, when the motor control device is started, as the temperature difference between the set temperature and the room temperature increases, the rotation speed of the compressor motor 3 increases sharply. The rotational acceleration of becomes large.

As shown in FIG. 5, the compressor motor 3 is synchronously operated at a low frequency for a predetermined time (t1) from the start of activation (the rotation speed of the compressor motor 3 is set to a predetermined value N1),
After the elapse of the predetermined time, the compressor motor 3 is operated based on the position detection signal of the rotor of the compressor motor 3 to increase the rotational acceleration of the compressor motor 3. Then, when the indoor temperature reaches the set temperature or near the set temperature, the compressor motor 3 is brought into the normal operation to keep the room temperature at the set temperature.

When the rotational acceleration of the compressor motor 3 is increased at the time of starting, the indoor temperature can be rapidly brought close to the set temperature when applied to an air conditioner, and rapid cooling and rapid heating are possible.

However, while the rotation speed of the compressor motor 3 rapidly reaches the maximum rotation speed Nmax or the set rotation speed,
For example, when the load is light, the rotation speed of the compressor motor 3 becomes unnecessarily high, which may be unfavorable in terms of power consumption of the motor control device, and when applied to an air conditioner, it will cause overcooling or overheating. Sometimes.

The present invention has been made in view of the above problems, and an object thereof is to suppress power consumption of a motor control device and to suppress overcooling and overheating when applied to an air conditioner. It is to provide a motor control device.

[0010]

In order to achieve the above object, the present invention relates to a motor control device for controlling the rotation of a motor, which is stored in advance from the start of activation of the motor to the normal operation of the motor. The gist is that the start pattern data corresponding to the load of the motor is selected from the plurality of start pattern data, and the rotation of the motor is controlled according to the selected start pattern data.

[0011]

With the above means, when the motor control device is applied to the air conditioner, one start pattern data is selected according to the temperature difference between the room temperature and the set temperature, and the smaller the temperature difference, The start pattern data that makes the rotational acceleration of the motor (compressor motor) gentle is selected.
Since the rotation speed of the motor at startup is controlled by the selected startup pattern data, the rotational acceleration of the motor does not become too large at startup.

Therefore, especially when the temperature difference between the room temperature and the set temperature is small, the rotation speed of the motor does not become too large, so that the power consumption of the motor control device is suppressed and the supercooling and overheating are performed. Will be suppressed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A motor control device according to the present invention switches a motor rotation speed pattern (starting pattern data) at the time of startup to an optimum pattern according to a load to suppress power consumption of the motor control device and also to an air conditioner. When applied to, it switches to an optimal pattern according to the temperature difference between the room temperature and the set temperature, suppresses power consumption, and suppresses overcooling and overheating.

Therefore, as shown in FIG. 1, the motor control device of the present invention has a plurality of start pattern data (ROMs).
In addition to the functions of the ROM unit (storage unit) 9 storing data) and the control unit 7 shown in FIG. 4, the indoor temperature and the set temperature data from the indoor unit microcomputer 6 are received, and the indoor temperature is set. R depending on the temperature difference between the room temperature and the room temperature
The control unit (outdoor unit microcomputer) 10 is provided for reading out one start-up pattern data of the OM unit 9 and controlling the rotation speed of the compressor motor 3 based on the determined start-up pattern data.

The compressor motor 3 may be not only a sensorless DC brushless motor but also an AC motor (AC induction motor).

The start pattern data stored in the ROM section 9 can control the rotational acceleration of the compressor motor 3 as shown by a solid line a, a dotted line b and a broken line c in FIG. 3, for example. is there. In this case, as is clear from FIG. 3, the pattern from the start of operation of the air conditioner (start of activation of the compressor motor 3) to the predetermined time (t1) is the same as the conventional example (the broken line c in the same figure; the solid line in FIG. 5). It is almost the same).

Next, the motor control device having the above configuration is applied to an air conditioner, and the operation of the motor control device will be described in detail with reference to the flow chart and the graph of FIG.
First, assuming that a driving operation is performed by the remote controller of the air conditioner, the indoor unit microcomputer 6 starts the air conditioner, and therefore the indoor temperature A and the indoor temperature A The data of the set temperature K by the remote controller is transmitted to the control unit 10 of the outdoor unit.

Then, for example, in the cooling operation, the control unit 10 causes a temperature difference (AK) between the room temperature A and the set temperature K.
Is calculated, and it is determined whether or not this calculated value (AK) is less than or equal to a predetermined value k1 (step ST1). If the calculated value (AK) is not less than or equal to the predetermined value k1, the calculated value (AK-
It is determined whether or not (K) exceeds a predetermined value k1 and is a predetermined value k2 (<k1) or less (step ST2). Further, if the calculated value (AK) is not less than or equal to the predetermined value k2, the calculated value (AK) exceeds the predetermined value kn-1 (<k2) and is less than or equal to the predetermined value kn (<kn-1). It is determined whether there is any (step ST3). Note that n is an integer.

In this way, the room temperature A and the set temperature K
The temperature difference between and is above a predetermined value k1, exceeds this predetermined value k1, exceeds a predetermined value k2, exceeds a predetermined value kn-1,
It is determined whether or not it is within the range of the predetermined value kn or less or the range exceeding the predetermined value kn. Based on this determination result, the start-up pattern data in the ROM section 9 is read out, and the rotational acceleration pattern at the start-up of the compressor motor 3 is determined (step ST4).

Specifically, for example, when the room temperature is 21 ° C. and the set temperature is 25 ° C., and the temperature difference is extremely small at 1 ° C., start pattern data for changing the rotational acceleration is selected as shown by the dotted line b in FIG. When the indoor temperature is 27 ° C. and the set temperature is 25 ° C. and the temperature difference is not so large as 2 ° C., the start pattern data for changing the rotational acceleration is selected as shown by the solid line a in FIG. When the temperature is 25 ° C. and the temperature difference is extremely large at 8 ° C., start pattern data for changing the rotational acceleration is selected as shown by the broken line c in FIG.

Then, as is apparent from FIG. 3, when the difference 8 ° C. between the room temperature and the set temperature is extremely large, the control unit 10
Rapidly increases the rotational acceleration of the compressor motor 3 when a predetermined time (t1) has elapsed from the start of the startup (shown by a broken line c in the figure). That is, unless the rotation speed of the compressor motor 3 is increased rapidly, the indoor temperature does not approach the set temperature and the indoor environment is not comfortable.

When the difference between the room temperature and the set temperature is 2 ° C., the control unit 10 starts the start for a predetermined time (t1).
When the time has elapsed, the rotational acceleration of the compressor motor 3 is slightly increased (shown by the solid line a in the figure).

Further, when the difference of 1 ° C. between the room temperature and the set temperature is extremely small, the control unit 10 gradually increases the rotational acceleration of the compressor motor 3 after a predetermined time (t1) has elapsed from the start of the activation (see FIG. Indicated by the dotted line b).

As described above, when the difference between the room temperature and the set temperature is small (in other words, when the load is light), the rotational acceleration of the compressor motor 3 is gently increased, so that the rotational speed of the compressor motor 3 is increased. Does not rise too much as indicated by the broken line c in FIG. Therefore, there is no extra consumption of energy in the shaded area in FIG. 2, that is, not only the efficiency of the compressor motor 3 is increased, but also the power consumption at the time of startup can be suppressed and the room does not become too cold. That is, overcooling can be suppressed.

In addition, in the above embodiment, the start-up of the cooling operation has been described, but the present invention can be applied to the heating operation. Therefore, the power consumption at the start-up can be suppressed and the overheating can be suppressed in the same manner as above. be able to.

Further, after the motor control device in the above-mentioned embodiment is started, that is, when the indoor temperature becomes the set temperature or near the set temperature, the control unit 10 controls the rotation speed command (from the indoor unit microcomputer 6 as in the conventional case. Frequency command)
Also, the rotation speed of the compressor motor 3 is controlled by the position detection signal of the rotor of the compressor motor 3, the compressor motor 3 is in normal operation, and the room temperature is kept at the set temperature.

Further, although the compressor motor 3 of the air conditioner has been described in this embodiment, it may be applied to a sensorless DC brushless motor or an AC motor of another device,
In this case, the same action and effect can be obtained.

[0028]

As described above, according to the motor control device of the present invention, the pattern of the number of rotations of the motor at the time of start-up (start-up pattern data) is switched to the optimum pattern according to the load, and the same motor is used. When applied to the compressor motor of an air conditioner, switch to an optimal pattern according to the temperature difference between the room temperature and the set temperature, and switch the rotation acceleration of the compressor motor to a gentler pattern as the temperature difference decreases. Therefore, when the load is light (the temperature difference is small), the rotation acceleration of the motor (compressor motor) does not become too large, that is, the rotation speed does not rise too much, so the power consumption at startup is suppressed. In addition, the efficiency of the motor itself can be improved, and it is possible to suppress overcooling and overheating in the air conditioner. There is an effect.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a motor control device showing an embodiment of the present invention.

FIG. 2 is a schematic flowchart illustrating an operation of the motor control device shown in FIG.

3 is a schematic graph illustrating the operation of the motor control device shown in FIG.

FIG. 4 is a schematic block diagram of a conventional motor control device.

5 is a schematic graph illustrating the operation of the motor control device shown in FIG.

[Explanation of symbols]

1 AC power supply (commercial) 2 AC / DC converter 3 Compressor motor (sensorless DC brushless motor,
AC motor) 4 Inverter circuit 5 Rotor position detection unit 6 Indoor unit microcomputer 7, 10 Control unit (outdoor unit microcomputer) 8 Inverter drive circuit 9 ROM unit (storage means)

Claims (3)

[Claims] 1. In a motor control device for controlling the rotation of a motor, the load of the motor among a plurality of pre-stored start pattern data is stored from the start of the start of the motor to the normal operation of the motor. A motor control device characterized in that start pattern data corresponding to the selected start pattern data is selected, and the motor is rotationally controlled in accordance with the selected start pattern data. 2. A motor control device for controlling the rotation of a motor of an outdoor unit at least by a difference between a set temperature of the indoor unit and the indoor temperature to bring the indoor temperature to an optimum temperature. A storage unit that stores a plurality of start-up pattern data that optimizes the temperature in the room by controlling the temperature in the room with respect to the set temperature; and according to the difference between the room temperature and the set temperature when the motor is started. A motor control device comprising: a start-up pattern data stored in the storage unit; and a control unit that controls the rotation of the motor based on the read start-up pattern data. 3. A motor control device for controlling rotation of a brushless motor of a compressor that constitutes a refrigeration cycle based on at least a difference between a set temperature of the indoor unit and the indoor temperature, and making the room an optimum temperature. Storage means for storing a plurality of start-up pattern data for controlling the indoor temperature with respect to the set temperature of the indoor unit to optimize the indoor temperature at the time of starting, and setting the indoor temperature and the setting at the time of starting the brushless motor. A motor control device comprising: a control unit that reads out one start-up pattern data of the storage unit according to a difference with a temperature and starts the motor based on the read out start-up pattern data.