阅读说明：本技术 电动机驱动装置以及空调机的室外机 (Motor drive device and outdoor unit of air conditioner ) 是由 宫森骏 浦慎一郎 于 2018-09-07 设计创作，主要内容包括：电动机驱动装置(42)具备：主基板(31),安装有基于从交流电源(11)供给的交流电力来生成驱动压缩机马达(41)的驱动电力的电源电路；多个接线切换继电器(46、47、48),切换压缩机马达(41)的接线；小基板(32),安装有接线切换继电器(46、47、48)；继电器驱动电路(23),切换接线切换继电器(46、47、48)；导线(24、25),将压缩机马达(41)以及小基板(32)与电源电路连接；以及导线(26、27),将小基板(32)与压缩机马达(41)连接。(A motor drive device (42) is provided with: a main substrate (31) on which a power supply circuit is mounted that generates drive power for driving a compressor motor (41) on the basis of AC power supplied from an AC power supply (11); a plurality of wiring switching relays (46, 47, 48) for switching the wiring of the compressor motor (41); a small substrate (32) on which wiring switching relays (46, 47, 48) are mounted; a relay drive circuit (23) for switching the wiring switching relays (46, 47, 48); lead wires (24, 25) connecting the compressor motor (41) and the small substrate (32) to the power circuit; and lead wires (26, 27) connecting the small substrate (32) and the compressor motor (41).)

1. A motor drive device is characterized by comprising:

a main board on which a power supply circuit is mounted that generates drive power for driving a motor based on alternating-current power supplied from an alternating-current power supply;

a small substrate on which a plurality of wiring switching relays for switching the wiring of the motor are mounted;

a relay drive circuit that switches the wiring switching relay;

a 1 st lead connecting the motor and the small substrate to the power supply circuit; and

and a 2 nd wire connecting the small substrate and the motor.

2. The motor drive device according to claim 1,

the relay drive circuit is mounted on the small substrate.

3. The motor drive device according to claim 1 or 2,

the distance between the small base plate and the motor is shorter than the distance between the main base plate and the motor.

4. An outdoor unit of an air conditioner, characterized in that,

a motor drive device according to any one of claims 1 to 3, and a motor driven by the motor drive device.

Technical Field

The present invention relates to a motor drive device that switches between a Y connection and a Δ connection, and an outdoor unit of an air conditioner.

Background

To reduce the amount of energy consumption, efficient operation of the motor is required.

Since the back emf of the Δ -wired motor is less than the back emf of the Y-wired motor, the Δ -wired motor can be operated at a higher rotational speed than the Y-wired motor under nominal conditions of high rotational speed. On the other hand, in an intermediate condition where the rotation speed is not high, a large current flows in the Δ -wired motor compared to the Y-wired motor, so that the loss is large.

Patent document 1 discloses a motor including a relay for switching a connection. The motor efficiency under the intermediate condition can be improved by providing a drive system that operates in delta connection at a high load when the rotation speed of the motor is high and operates in Y connection at a low load when the rotation speed is not high.

Patent document 1: japanese laid-open patent publication No. 2009-216324

In order to realize control for switching between the Y wiring and the Δ wiring, a wiring switching relay needs to be mounted on the substrate. In the case of a three-phase motor, three relays are required. In the case of a motor in which a large current flows, a relay having a large capacity needs to be used for switching the wiring, and a space for mounting the relay having a large outer diameter needs to be secured on the substrate. On the other hand, in a model in which control for switching between the Y connection and the Δ connection is not performed, it is not necessary to secure a space for mounting a relay on a substrate. Therefore, it is difficult to make a motor drive device using a substrate on which a relay for switching the wiring is mounted common to a model substrate requiring no space for mounting the relay.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to obtain a motor drive device that can make a main board common to a model that does not perform control for switching between Y connection and Δ connection.

In order to solve the above problems and achieve the object, a motor drive device according to the present invention includes: a main board on which a power supply circuit is mounted that generates drive power for driving a motor based on alternating-current power supplied from an alternating-current power supply; a small substrate on which a plurality of wiring switching relays for switching the wiring of the motor are mounted; and a relay drive circuit that switches the wiring switching relay. The motor drive device according to the present invention includes: a 1 st lead connecting the motor and the small substrate to a power supply circuit; and 2 nd lead wire, connect the small base plate with electric motor.

The motor driving device according to the present invention has an effect of making the main board common to a model in which switching between the Y connection and the Δ connection is not controlled.

Drawings

Fig. 1 is a circuit diagram of an outdoor unit to which a motor drive device according to embodiment 1 of the present invention is applied.

Fig. 2 is a diagram showing a configuration of an outdoor unit to which the motor drive device according to embodiment 1 is applied.

Fig. 3 is a circuit diagram of an outdoor unit to which a motor drive device according to embodiment 2 of the present invention is applied.

Fig. 4 is a diagram showing a configuration of an outdoor unit to which the motor drive device according to embodiment 2 is applied.

Detailed Description

Hereinafter, a motor driving device and an outdoor unit of an air conditioner according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment.

Embodiment 1.

Fig. 1 is a circuit diagram of an outdoor unit of an air conditioner to which a motor drive device according to embodiment 1 of the present invention is applied. An outdoor unit 101, which is an outdoor unit of an air conditioner, includes a compressor motor 41 as an electric motor and an electric motor drive device 42 for driving the compressor motor 41. The motor drive device 42 is connected to an AC power supply 11 on the input side of an AC (alternating current)/DC (direct current) converter 12, and connected to a smoothing capacitor 13, the input side of a DC/DC converter 14, and an inverter 15 on the output side of the AC/DC converter 12. The output-side lead 24 of the inverter 15 is connected to a lead 25. The lead 25 branches off, and one is connected to the compressor motor 41, and the other is connected to the relay movable portions 16, 17, and 18 of the connection switching relays 46, 47, and 48. Lead wires 26 on the output side of the relay movable portions 16, 17, and 18 are connected to lead wires 27. A compressor motor 41 is connected to the lead 27. On the output side of the DC/DC converter 14, the relay coils 19, 20, and 21 of the connection switching relays 46, 47, and 48 are connected via the relay coil voltage line 28. The relay coils 19, 20, and 21 are connected to a ground line 29 via a relay drive circuit 23. The control circuit 22 transmits a signal to the relay drive circuit 23 via the relay drive signal line 30 in order to switch the Y connection and the Δ connection.

The AC/DC converter 12, the smoothing capacitor 13, the DC/DC converter 14, the inverter 15, and the control circuit 22 are mounted on the main substrate 31. The AC/DC converter 12, the smoothing capacitor 13, the DC/DC converter 14, and the inverter 15 constitute a power supply circuit that generates drive power for driving the compressor motor 41 based on the AC power supplied from the AC power supply 11. The lead wires 24 and 25 are the 1 st lead wire connecting the compressor motor 41 and the small board 32 to the power supply circuit. The lead wires 26 and 27 are the 2 nd lead wire connecting the small board 32 and the compressor motor 41. The relay movable portions 16, 17, and 18, the relay coils 19, 20, and 21, and the relay drive circuit 23 are mounted on the small board 32.

Fig. 2 is a diagram showing a configuration of an outdoor unit to which the motor drive device according to embodiment 1 is applied. An outdoor unit fan 102, an electric component unit 103 having the main substrate 31, and a compressor 104 having a compressor motor 41 are mounted on the outdoor unit 101. The main substrate 31 is connected to the compressor motor 41 via the wires 24 and 25. The main board 31 and the small board 32 are connected by the relay coil voltage line 28, the ground line 29, and the relay drive signal line 30 that transmits a signal to the relay drive circuit 23. The small board 32 is connected to the compressor motor 41 via the wires 26 and 27. By disposing small board 32 closer to compressor 104 than main board 31, lead wire 26 can be shortened. That is, the distance between the small board 32 and the compressor motor 41 is shorter than the distance between the main board 31 and the compressor motor 41, whereby the lead wire 26 can be shortened.

The motor drive device 42 according to embodiment 1 is configured such that the small board 32 is provided independently of the main board 31, the wiring switching relays 46, 47, and 48 are attached to the small board 32, and the three lead wires 26 for flowing current to the compressor motor 41 are connected to the wiring switching relays 46, 47, and 48. Therefore, it is not necessary to secure a space for installing the wiring switching relays 46, 47, and 48 on the main board 31. Therefore, the main substrate 31 can be designed to have the same size and shape as those of a model substrate without a relay. Thus, the main board 31 does not need to be developed exclusively for control for switching between the Y connection and the Δ connection, and can be shared with other models. Further, by disposing the small board 32 close to the compressor 104, the three lead wires 26 connecting the small board 32 and the compressor motor 41 can be shortened. This can reduce the wiring resistance in addition to cost reduction by the amount of shortening of the lead 26, and thus can reduce the influence of noise.

Embodiment 2.

Fig. 3 is a circuit diagram of an outdoor unit to which a motor drive device according to embodiment 2 of the present invention is applied. The motor drive device 42 according to embodiment 2 is different from the motor drive device 42 according to embodiment 1 in that the relay drive circuit 23 is mounted on the main board 31 instead of the small board 32.

Fig. 4 is a diagram showing a configuration of an outdoor unit to which the motor drive device according to embodiment 2 is applied. Since the relay drive circuit 23 is mounted on the main board 31, the relay drive signal line connecting the control circuit 22 and the relay drive circuit 23 is formed of a conductor pattern of the main board 31. Therefore, the number of leads connecting main board 31 and small board 32 can be reduced.

The motor drive device 42 according to embodiment 2 can reduce the number of lead wires connecting the main board 31 and the small board 32, and can reduce the cost. In addition, it is not necessary to secure a space for installing the wiring switching relays 46, 47, and 48 on the main board 31. Therefore, the main substrate 31 can be designed to have the same size and shape as those of a model substrate without a relay. Thus, the main board 31 does not need to be developed exclusively for control for switching between the Y connection and the Δ connection, and can be shared with other models.

The configuration described in the above embodiment is an example of the content of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified within a range not departing from the gist of the present invention.

Description of reference numerals:

11 … a.c. power supply; 12 … AC/DC converter; 13 … smoothing capacitor; 14 … DC/DC converter; 15 … inverter; 16. 17, 18 … relay movable part; 19. 20, 21 … relay coil; 22 … control circuitry; 23 … relay drive circuit; 24. 25, 26, 27 … wires; 28 … relay coil voltage line; 29 ground line 29 …; 30 … relay drive signal line; 31 … a main substrate; 32 … small substrates; 41 … compressor motor; 42 … motor drive; 46. 47, 48 … wiring switching relays; 101 … outdoor unit; 102 … outdoor unit fan; 103 … electrical components; 104 … compressor.