JPH09247903A - Electric motor with control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the replacing cost and to simplify the replacing operation when a controller is required to be replaced. SOLUTION: The motor with an inverter comprises a switching element and a power unit 8 detachably mounted at the terminal 6 of the motor 1 to supply power to the motor 1. The motor also comprises a control unit 9 having a control circuit for controlling the element and detachably mounted at the unit 8. Thus, if the inverter 7 is required to be replaced, it can be dealt with merely by replacing one of the inverter 7 and the unit 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor with a control device configured to integrally mount a control device for driving and controlling the electric motor on a main body of the electric motor.

[0002]

As a control device, for example, an electric motor in which an inverter device is integrally attached to a terminal portion provided on a frame of the electric motor is considered. In this configuration, for example, the power supply voltage is 200V
When it is necessary to switch from 400V to 400V, the connection of the winding on the motor side is switched from 200V connection to 400V connection, and the inverter device is switched from 200V to 40V.
Need to be replaced for 0V. In this case, the electric motor can be used as it is by simply switching and connecting the windings, whereas the inverter device has to be replaced as a whole, which causes a problem that the replacement cost is considerably high.

Therefore, an object of the present invention is to provide an electric motor with a control device which can reduce the replacement cost and easily perform the replacement work when the control device needs to be replaced. .

[0004]

An electric motor with a control device according to the present invention is detachably attached to a main body of the electric motor, has a switching element, and has a power unit for supplying electric power to the electric motor, and is attachable to and detachable from the power unit. It is characterized in that it is provided with a control unit attached to the control unit having a control circuit for controlling the switching element.

According to the above configuration, since the control device can be divided into the power unit and the control unit, when the control device needs to be replaced, it is possible to deal with it by replacing only one of the power unit and the control unit. Therefore, the replacement cost can be reduced. Further, since the power unit can be attached to and detached from the main body of the electric motor and the control unit can be attached to and detached from the power unit, the replacement work is simplified.

Further, in the case of the above configuration, it is preferable that the power unit is configured to be connected to the terminal portion provided on the main body through the connector, and the control unit is configured to be connected to the power unit through the connector. . Further, when the control device is composed of an inverter device, it is a more preferable configuration that the power unit is provided with a main circuit of the inverter device and the control unit is provided with a control circuit of the inverter device. Furthermore, it is preferable that a plurality of types of power units are prepared so as to correspond to a plurality of power supply voltages, and the power units are exchanged when the power supply voltage is switched. Further, the main body is constructed so that the winding connection is switched and changed by changing the connection of the motor terminal portion.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment in which the present invention is applied to an electric motor with an inverter device will be described below with reference to FIGS. 1 to 9. First, in FIG. 1 showing a schematic overall configuration of an electric motor with an inverter device, the electric motor 1 is composed of, for example, a three-phase induction electric motor, and the main body of the electric motor 1 is
A substantially cylindrical frame 2 and bearing brackets 3 attached to both ends of the frame 2 (only one shown)
It is composed of Inside the main body of the electric motor 1, a stator is fixed and a rotor is rotatably provided. The shaft 4 of the rotor is supported by the bearing bracket 3 via a bearing. An outer fan is attached to the left end of the shaft 4 in FIG. 1, and the outer fan is covered with a cover 5.

A terminal portion 6 (see FIG. 7) is arranged on the outer peripheral portion of the frame 2. The specific configuration of the terminal portion 6 will be described later. An inverter device 7 is detachably attached to the terminal portion 6 as a control device. The inverter device 7 has a rectangular box shape as a whole, and as shown in FIG.
The power unit 8 and the control unit 9 are connected to each other.

Here, the electrical configuration of the inverter device 7 will be described with reference to FIG. As shown in FIG.
The inverter device 7 includes an inverter main circuit 10 and a control circuit 1.
And 1. Here, the inverter main circuit 1
The 0 side is built in the power unit 8 and the control circuit 1
One side is configured to be built in the control unit 9.

The inverter main circuit 10 includes a rectifying circuit 12, a smoothing capacitor 13, and a switching circuit 1.
And 4. The rectifier circuit 12 is composed of six diodes 15, and inputs a three-phase AC power source, which is a commercial power source, through input terminals 10R, 10S, and 10T to rectify it. The rectified output rectified by the rectifying circuit 12 is smoothed by the smoothing capacitor 13 and output between the DC power supply lines 16 and 17.

The switching circuit 14 supplied with power from the DC power supply lines 16 and 17 is formed by connecting six switching elements 18 in a three-phase bridge connection.
Each switching element 18 is, for example, an IGBT, FET,
It is composed of a semiconductor element such as a thyristor. still,
A freewheel diode (feedback diode) 19 is connected in parallel to each switching element 18. In the case of this configuration, each switching element 18 is switched so that the switching circuit 14
Three-phase AC is output from the three-phase output terminals 10U, 10V, and 10W, and the three-phase AC is supplied to the electric motor 1.

Each switching element 18 of the inverter main circuit 10 is constructed to be on / off controlled by a control signal provided from the control circuit 11. The control circuit 11 is mainly composed of a microcomputer, an integrated circuit and the like, and has a function of generating a control signal for controlling ON / OFF of each switching element 18 of the inverter main circuit 10. Further, as shown in FIG. 4, the control circuit 11 drives and controls the display 20 provided on the upper surface of the control unit 9 and also has a large number of key switches 2 provided on the upper surface of the control unit 9.
It is configured to receive the switch signal from 1.

In this structure, the user operates the various key switches 21 while visually observing the display 20 to set the operating conditions of the inverter device 7, start the operation, and perform the operation. It is configured so that it can be stopped.

Next, a specific configuration for detachably connecting the power unit 8 and the control unit 9 of the inverter device 7 will be described with reference to FIGS. 4, 5 and 6. A male connector 22 is provided on the upper side surface of the control unit 9 in FIG. 4 so as to project upward. A female connector 23 is provided on the side surface of the power unit 8 on the lower side in FIG. 4, and the male connector 22 of the control unit 9 is configured to be fitted and connected to the female connector 23. There is. This allows the two units 8, 9 to
Are integrated.

When both connectors 22 and 23 are fitted and connected, a large number of concave terminals 22a provided in the male connector 22 and a large number of protruding terminals 23a provided in the female connector 23 are connected. Is configured to. The inverter main circuit 10 and the control circuit 11 are connected by connecting these terminals 22a and 23a. In this case, the male connector 22 and the female connector 23 form a connector 24. The control circuit 11
The direct-current constant-voltage power supply to be supplied to is configured to be generated by a constant-voltage power supply circuit (not shown) provided on the inverter main circuit 10 side. The DC constant voltage power supply output from the constant voltage power supply circuit is the connector 22,
It is adapted to be supplied to the control circuit 11 via 23.

On the other hand, on the side surface of the power unit 8 on the upper side in FIG. 4, an input terminal 10R for inputting a three-phase AC power source,
10S and 10T are provided. These input terminals 10
The terminals of the three power supply lines 25, 26, 27 (see FIG. 1) of the three-phase AC power supply are screwed and connected to R, 10S, and 10T. The input terminal 10
The R, 10S, and 10T are configured to be covered by a terminal cover 28 that is detachably attached to the power unit 8.

As shown in FIGS. 5 and 6, three-phase output terminals 10U, 10V, 10W of the inverter main circuit 10 project downward at the right end of the lower surface of the power unit 8 in FIG. It is set up. These output terminals 10U, 1
0V and 10W are respectively the large diameter portion 29a having a cylindrical shape and the small diameter portion 29 having a cylindrical shape protruding from the center of the large diameter portion 29a.
b.

In the power unit 8 thus constructed, the voltage of the input three-phase AC power source is, for example, 200.
One for 200V corresponding to V and one for 400V corresponding to the input voltage of the three-phase AC power source of 400V are prepared. The power unit 8 for 200V and the power unit 8 for 400V have the same outer size, and also have the same shape such as a connector and a terminal. The difference between the two is that each component constituting the built-in inverter main circuit 10 (switch element 18 and smoothing capacitor 13
Withstand voltage of 200V or 400V
That is the point. To identify the two, characters or the like indicating 200V or 400V are printed on the surface of each power unit 8.

Next, a specific structure of the terminal portion 6 of the electric motor 1 will be described with reference to FIGS. 7, 8 and 9. At the upper end of the terminal portion 6 in FIG. 7, three motor input terminals 6R,
6S and 6T are provided. These motor input terminals 6
As shown in FIG. 8, R, 6S, 6T are provided with stepped recesses 6a into which the output terminals 10U, 10V, 10W of the power unit 8 are detachably fitted and connected.
In the case of this configuration, the power unit 8 (and the control unit 9) is attached to the terminal portion 6 by fitting and connecting the output terminals 10U, 10V, and 10W of the power unit 8 to the motor input terminals 6R, 6S, and 6T. Has become.

In this case, the motor input terminal 6 of the terminal portion 6
R, 6S, 6T and the output terminal 10U of the power unit 8,
The connector 30 is composed of 10V and 10W.
If the strength of attachment of the power unit 8 and the control unit 9 to the electric motor 1 is insufficient only with the connecting force of the connector 30, the attachment strength is increased by attaching other components such as an attachment plate and screws. It may be configured as follows.

Further, the motor input terminal 6 in the terminal portion 6
Three relay terminals 31 are provided below R, 6S, and 6T in FIG.
R, 31S, 31T are arranged. These relay terminals 31R, 31S, 31T are connected to the motor input terminals 6R, 6S, 6T via the conducting plates 32, 32, 32. Further, the relay terminals 31R, 31S in the terminal portion 6,
In the lower part of FIG. 7 of 31T, nine winding terminals 33U1, 3 are provided.
3V1, 33W1, 33U2, 33V2, 33W2, 3
3X1, 33Y1, and 33Z1 are arranged. These nine winding terminals 33U1 to 33Z1 are the terminals of the six windings 34 to 39 of the electric motor 1, as shown in FIG.

In this case, the electric motor 1 includes the six windings 34 ...
This is a type of electric motor in which the voltage of the input three-phase AC power supply can be switched between 200 V and 400 V by connecting two types of Y connection of 39. Specifically, the electric motor 1 has six windings 34 to 39 (that is, nine winding terminals 33U1 to 33).
By connecting Y1 to Z1) as shown in the right column of FIG. 9B, a low voltage (200 V) specification is achieved, while six windings 34 to 39 (that is, nine winding terminals 33U1 to 33U1). 33
A high voltage (400 V) specification is achieved by connecting Z1) as a Y connection as shown in the left column of FIG. 9B. Incidentally, FIG.
In (b), the line segment described between the terminals of the windings 34 to 39 represents the connected state.

Further, in the case of the above construction, the user is configured to realize the switching of the two types of Y connection shown in FIG. 9B by using the short circuit plate 40 as shown in FIG. .
Incidentally, FIG. 7 shows a connection state in which the Y connection of the low voltage (200 V) specification is switched. Further, in the terminal portion 6, plastic partition walls 6b and 6c are provided for the terminal groups U, V, W (R,
S, T) are provided so as to partition each phase.

Now, in this embodiment having such a structure, the operation for switching the voltage of the commercial AC power supply (three-phase AC power supply) from 200V to 400V will be described. First, it is assumed that the inverter-equipped electric motor 1 is set to the 200V specification. In this state, the inverter device 7 is removed from the terminal portion 6 of the main body of the electric motor 1. Then, by connecting the nine winding terminals 33U1 to 33Z1 of the terminal portion 6 with the short circuit plate 40 as shown in the left column of FIG. 9B, the six windings 34 to 39 are connected to a high voltage (400V). ) Switch to the Y connection of the specifications.

At the same time, the power unit 8 and the control unit 9 of the inverter device 7 are separated. Then, instead of the separated power unit 8 for 200 V, 400
Power unit 8 for V and control unit 9 separated from the above
And are connected by fitting and connecting the connector via 24.
The input terminal 10 of the power unit 8 for 400V is
For R, 10S, and 10T, 3 of 400V three-phase AC power supply
The power supply lines 25, 26, 27 of the book are connected in advance.
Subsequently, the connected inverter device 7 is attached to the terminal portion 6 of the electric motor 1. Specifically, the output terminals 10U, 10V, 10W of the power unit 8 of the inverter device 7 are fitted and connected to the motor input terminals 6R, 6S, 6T of the terminal portion 6 to be connected. This completes the switching from 200V to 400V.

Therefore, according to the present embodiment, when the power supply voltage is switched, it can be dealt with by only replacing the power unit 8 of the inverter device 7, and the replacement cost can be reduced as compared with the conventional configuration. . Further, when performing this replacement work, the power unit 8 can be attached to and detached from the terminal portion 6 of the electric motor 1 via the connector 30 and the control unit 9 can be attached to and detached from the power unit 8 via the connector 24. Work can be done easily.

FIG. 10 shows a second embodiment of the present invention, and the difference from the first embodiment will be described. still,
The same parts as those in the first embodiment are denoted by the same reference numerals. The electric motor 41 of the second embodiment has six windings 42 to 47.
This is a type of electric motor that can switch the voltage of the input three-phase AC power supply to a low voltage (200 V) or a high voltage (400 V) by making a Δ connection. Specifically, in the electric motor 41, the six windings 42 to 47 (that is, the nine winding terminals U1 to Z1 of the terminal portion) are Δ-connected as shown in the right column of FIG. 10B. Therefore, the low voltage (200V) specification is achieved, and on the other hand, the six windings 42 to 47 (that is, the nine winding terminals U1 to Z1) are Δ-connected as shown in the left column of FIG. 10B. Therefore, high voltage (400 V) specifications are achieved. In this case, the user is configured to implement the two types of Δ connection switching shown in FIG. 10B by using the short-circuit plate 40, as in the first embodiment.

The configuration of the second embodiment other than that described above is the same as the configuration of the first embodiment. Therefore, the same operation and effect as in the first embodiment can be obtained in the second embodiment.

FIG. 11 shows the third embodiment of the present invention, and the difference from the first embodiment will be described. The same parts as those of the first embodiment are denoted by the same reference numerals. The electric motor 48 of the third embodiment has three windings 49-
This is a type of electric motor capable of switching the input voltage of the three-phase AC power supply to a low voltage (220V) or a high voltage (380V) by connecting 51 by Δ connection or Y connection. Specifically, the electric motor 48 has three windings 49 to 51 (that is,
By connecting the six winding terminals U, V, W, Z, X, and Y) of the terminal portion by Δ as shown in the right column of FIG. 11B,
Low voltage (220V) specifications, while 3 windings 49
~ 51 (ie six winding terminals U, V, W, Z, X,
By connecting Y) as shown in the left column of FIG. 11B, a high voltage (380V) specification is achieved. In this case, the user is configured to realize the Δ connection or the Y connection switching shown in FIG. 11B by using the short-circuit plate 40, as in the first embodiment.

The structure of the third embodiment other than the above is the same as the structure of the first embodiment. Therefore, also in the third embodiment, it is possible to obtain the same effect as that of the first embodiment.

In each of the above embodiments, the inverter device 7 is detachably attached to the terminal portion 6 of the frame 2 of the electric motor 1. However, other parts of the electric motor 1, for example, other outer peripheral surface portions of the frame 2, or Alternatively, the bearing bracket 3 may be detachably attached to an appropriate portion of the outer surface portion of the bearing bracket 3 via a fixture. In the case of such a configuration, the power supply output line is led out from the power unit 8 of the inverter device 7, and the connector provided at the tip of the power supply output line is connected to the motor input terminal 6R of the terminal portion 6 of the electric motor 1.
It may be configured to be fitted and connected to the 6S and 6T. Further, in this case, the connector connection may be stopped and each terminal of the power supply output line may be connected to the motor input terminals 6R, 6S, 6T by screwing.

Furthermore, in each of the above-described embodiments, the case where the power supply voltage is switched is applied, but the present invention is not limited to this, and may be applied when changing the rated capacity of the inverter device 7, for example. Specifically, in the electric motor with the inverter device, the inverter device 7 having a rated capacity corresponding to the output rating of the electric motor 1 is mounted. However, when the electric motor 1 is driven by the inverter device 7 having such rated capacity, the torque of the electric motor 1 may be insufficient. For example, insufficient torque is likely to occur when the electric motor 1 is operated at a low frequency. In such a case,
Replacing the inverter device 7 with a rated capacity of one rank or two ranks can eliminate the torque shortage.
Therefore, if the above replacement is desired, it is possible to replace only the power unit 8 of the inverter device 7 with a unit 8 having a rated capacity one rank above or two ranks above.

In each of the above embodiments, the case where the power unit 8 side of the inverter device 7 is replaced has been described, but when it becomes necessary to replace the control unit 9 side,
For example, if the control circuit in the control unit 9 fails, only the control unit 9 needs to be replaced.

Furthermore, in each of the above-described embodiments, the invention is applied to the configuration in which the inverter device 7 drives and controls the electric motor 1. However, the present invention is not limited to this. For example, it is applied to the configuration in which the phase control device drives and controls the electric motor 1. You may.
In this case, the phase controller may be divided into a power unit including a switching element and a control unit including a control circuit. Further, in each of the above-described embodiments, the case where the electric motor 1 is an induction motor is applied, but the case where the electric motor 1 is a synchronous motor or another AC electric motor may be applied.

[0035]

As is apparent from the above description, the present invention is a control unit having a switching element and a power unit for supplying electric power to the electric motor, which is detachably attached to the main body of the electric motor and has a control circuit for controlling the switching element. Since the unit is detachably attached to the power unit, when the control device needs to be replaced, it is possible to deal with it by replacing only one unit, and the replacement cost can be reduced. At the same time, there is an excellent effect that the replacement work can be easily performed.

[Brief description of drawings]

FIG. 1 is a perspective view of an electric motor with an inverter device showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of an inverter device.

FIG. 3 is an electric circuit diagram of the inverter device.

FIG. 4 is an exploded top view of the inverter device.

FIG. 5 is an exploded side view of the inverter device.

FIG. 6 is an exploded bottom view of the inverter device.

FIG. 7 is a top view of the terminal portion.

FIG. 8 is a partial side view of the terminal portion.

FIG. 9 is a diagram showing a mode of connection switching of windings of an electric motor.

FIG. 10 is a view corresponding to FIG. 9 showing a second embodiment of the present invention.

FIG. 11 is a view corresponding to FIG. 9 showing a third embodiment of the present invention.

[Explanation of symbols]

1 is an electric motor, 2 is a frame, 3 is a bearing bracket, 6 is a terminal portion, 6R, 6S and 6T are motor input terminals, 7 is an inverter device (control device), 8 is a power unit, 9 is a control unit, and 10 is an inverter main Circuit, 10R, 10
S, 10T are input terminals, 10U, 10V, 10W are output terminals, 11 is a control circuit, 14 is a switching circuit, 18
Is a switching element, 22 is a male connector, 23 is a female connector, 24 is a connector, 25, 26 and 27 are power lines, 30 is a connector, 33U1, 33V1 and 33W.
1, 33U2, 33V2, 33W2, 33X1, 33Y
1, 33Z1 are winding terminals, 34 to 39 are windings, 40 is a short-circuit plate, 41 is an electric motor, 42 to 47 are windings, 48 is an electric motor, and 49 to 51 are windings.

Claims (4)

[Claims] 1. A main body of an electric motor, a power unit detachably attached to the main body, the power unit having a switching element and supplying electric power to the electric motor, and a control detachably attached to the power unit for controlling the switching element. An electric motor with a control device comprising a control unit having a circuit. 2. The power unit is connected to a terminal portion provided on the main body via a connector, and the control unit is connected to the power unit via a connector. An electric motor with a control device according to item 1. 3. The electric motor with a control device according to claim 1, wherein a main circuit of the inverter device is provided in the power unit, and a control circuit of the inverter device is provided in the control unit. 4. A plurality of types of the power unit are prepared so as to correspond to a plurality of power supply voltages, and the power unit is replaced when the power supply voltage is switched.
An electric motor with a control device according to any one of 1.