JPH08289505A - Motor with built-in controller - Google Patents

Abstract

PURPOSE: To improve environment resistance and productivity by incorporating a controller in the frame of a motor. CONSTITUTION: On the anti-load side of a motor, a frame 23 and a bracket, which supports the bearing on the anti-load side, are formed of metal members such as aluminum. As a unitary body. A power-part circuit 54 and a control circuit 53 are formed as a unitary body. The inverter formed in this way is attached to the outer-fan side of a hermetic fan-cooled dynamo-electric machine. Cooling is performed by the outer fan of the dynamo-electric machine together with the dynamo-electric machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor having a built-in inverter device in a rotary electric machine which operates at a variable speed in an inverter device which is a variable speed control device.

[0002]

2. Description of the Related Art FIG. 10 is a block diagram of an example of a conventional inverter system. Reference numeral 10 is a commercial power supply, 20 is an electric motor, and 50 is a control device (inverter). The control device 50 has a voltage, a current, and a frequency as an operation amount given to drive the electric motor 20 at a variable speed.
Reference numeral 51 is a converter unit for once converting the AC commercial power source 10 back to DC, 52 is an inverter unit for converting DC to AC of variable frequency, and 53 is a control unit for controlling the output element of the inverter to output the set frequency. It is composed of a control unit for.

FIG. 11 shows a typical structure of a conventional totally enclosed fan motor. Reference numeral 21 is a stator core, 22 is a coil wound around the stator core 21, 23 is a frame in which the stator core 21 is fitted on the inner circumference, 25 is a rotor, 26 is a bracket for supporting the rotor 25, and 27 is a rotor 25. The fan connected to the, 28 is a cover for protecting the fan 27,
The wind from the fan 27 that rotates together with the rotor shaft while the electric motor is operating cools the outer periphery of the frame 23.

The electric motor is a mechanism in which a current is passed through the coil 22 and torque is generated by a rotating magnetic field generated, so that the coil 22
Is a heating element. The temperature rise limit of the coil 22 is defined by the heat resistant insulation grade. For example, in the case of Class E insulation, which is a general type of a 400 W fully enclosed fan-type small electric motor driven by a three-phase power source, the temperature rise limit is 75 ° C., and the ambient temperature during operation is 40 ° C. Is 115 ° C
And it becomes very hot. Therefore, as an example, the temperature inside the electric motor may be 60 to 70 ° C., and the surface of the electric motor around the outer periphery of the stator core 21 may be 80 to 90 ° C.

In order to change the speed of the conventional electric motor 20,
The inverter 50 and the electric motor 20 were separately installed and connected through the power lines 11 and 12 to operate the electric motor 20 as shown in FIG. Since the inverter device is installed in the control panel and the installation environment is good, the open type in which the air around the control board ventilates with the outside air is general.

On the other hand, since the electric motor is installed outdoors or indoors exposed to wind and rain, in the vicinity of machine tools, etc., such as oil, dust, humidity, floor vibration, etc., where the installation environment cannot be said to be good, it is often a totally enclosed fan shape. . Therefore, the control panel installed in the factory is a closed type on-site operation panel, and the inverter device installed in the factory site is a closed type instead of a general open type in which inside air and outside air are distributed. In the case of a closed type inverter device, the heat dissipation is poor and it is necessary to install a cooling fin, install a cooling fan, or enlarge the container to improve the cooling performance.

As the electric motor in which the control device is built in the electric motor 20, there are many brushless motors driven by direct current. The output is often several tens of watts and is common in household electrical appliances such as household air conditioners, and a brushless motor is rotated by a direct current obtained by rectifying from a household single-phase power supply. In the brushless motor, a magnetic pole sensor for detecting a magnetic pole of a magnet adhered to the rotor and switching a transistor for outputting a current, and a rotation sensor for detecting a rotation speed are also integrated with the control board.

In order to detect the magnetic pole of the magnet with the sensor on this control board, it is necessary to install it inside the bearings on both sides that support the rotor. Therefore, considering the heat resistance of the electronic components on the control board, the internal temperature of the electric motor cannot be increased, so there is a limitation in increasing the output. For this reason, a large heat sink is attached to an IC (integrated circuit) in order to improve the cooling of components having temperature restrictions, for example, in Japanese Patent Laid-Open No. 4-67759. Furthermore, in order to improve heat dissipation, a large heat sink is attached directly to the lower case that supports the bearing.

However, in this example, the assembly is complicated because it is necessary to connect the IC and the control board with leads or connectors. Further, since the electric motor and the control board are connected inside the electric motor, the electric motor alone cannot be tested (for example, resistance value measurement, insulation resistance test, withstand voltage test, etc.) in the finished product state.

Further, as disclosed in Japanese Patent Laid-Open No. 60-152247, the control circuit is housed in a fully closed / cylindrical container that also serves as a heat sink, and is cooled by a cooling wind of the electric motor main body generated by an external fan of the rotating electric machine. There is an example of realizing an electric motor with a built-in control device, which is characterized by its compactness and improved environmental resistance. In this example, a power conversion element (such as a power transistor) which is a heating element and a capacitor whose function is greatly deteriorated by heat are arranged in the radial direction on the cylinder and radiate heat from the outer circumference.

The control board that generates almost no heat is devised so that a hole is formed in the center and the shaft is passed through. However, it is difficult to automate the arrangement of the parts on the cylinder, resulting in a high manufacturing cost. Also in this example, since the electric motor and the control board are connected inside the electric motor, the electric motor alone cannot be tested (for example, resistance value measurement, insulation resistance test, withstand voltage test, etc.) in the finished product state.

FIG. 12 shows an example of a standard structure of a conventional inverter device alone. (The case is not shown) 41 is a power circuit of the inverter device 50 and a heat generating section, and 42 is a control circuit (printed circuit board). This inverter device 5
As shown in the figure, 0 has a two-layer structure in which the power circuit of the heat generating section and the control circuit of the thermally weak printed circuit board are separated.

In the case of a single inverter, it is generally an open type in which the inside air and the outside air are ventilated, but the output is determined by the temperature restriction of the power section circuit which is the heat generating section. In many cases, heat radiation fins are attached, and if further cooling is required, a small fan is used for cooling. The above structure has been proposed because it is necessary to devise to reduce the thermal influence on the control device when the inverter device is built in the electric motor.

[0014]

The first problem is that when the control device 50 and the motor 20 are separated as described above, since the carrier frequency of the inverter device 50 is high, there is a problem between the inverter device 50 and the motor 20. Power line 12
Radio waves due to harmonics may be radiated from the device, causing noise or malfunction in electronic devices such as radios and calculators. As a countermeasure, it is conceivable to provide a metal pipe for each power supply line 12, but this requires construction and is complicated when changing the pipe, which is inconvenient.

It is known that when the inverter device 50 and the motor 20 are separated, an inverter surge occurs when the distance between the inverter device 50 and the motor 20 becomes long. At the output of the inverter device of 400V, when the cable distance exceeds, for example, 100m, the peak voltage of the inverter device surge voltage of 1200V is generated and usually 6
In some cases, the insulation of the low-voltage motor used at 00V or less was destroyed. Therefore, there is a method of installing a surge filter on the output side of the inverter device or strengthening the insulation of the electric motor as a countermeasure when a high surge of the inverter device occurs.

The second problem is that, when the inverter device is built in, unless the inverter device is made as small and thin as possible, the total length of the electric motor becomes large and the compatibility with the size of the electric motor in the case where the inverter device is separately installed may be lost. In some cases, there is a problem that a machine using the electric motor becomes large. Therefore, it is desirable to make the thickness (dimension in the axial direction) of the inverter device as thin as possible.

The third problem is that when a motor incorporating an inverter device is operated, a start switch for inverter output (motor input) is attached to the motor as in the case of a separately installed inverter device. It is necessary to press and becomes complicated when using many electric motors. Alternatively, there is a problem that it is necessary to draw the start signal line and an extra signal line is needed as compared with the case of separately mounting. This signal line should be considered separately from the power supply line so that it does not malfunction due to noise, etc.

When the inverter device is operated separately, an alarm is displayed and the motor operation is interrupted when an abnormal operation such as overvoltage or overcurrent occurs. When the motor stops due to an abnormality, the cause can be estimated from this alarm display. However, there is a method of displaying an alarm when an abnormal stop occurs as a function required for automatic operation with an electric motor incorporating an inverter device. In the case of the built-in type, it is necessary to disassemble the inverter device, but since the power is cut off when disassembling, the memory related to the alarm of the inverter device is also lost. The same applies when the power supply is stopped when the inverter device is stopped. When the inverter device is stopped, the output of the inverter device is stopped, but the inverter device continues to supply power, and if the alarm display can be confirmed from the outside without separating the inverter device inside the motor, this problem becomes unnecessary.

The fourth problem is that, when testing an electric motor incorporating an inverter device, there are three types of tests: a test of the electric motor alone, an operation test of the inverter device alone, and a combination test. When a malfunction occurs in the operation of this built-in electric motor, in order to identify whether the defective part is the inverter device or the electric motor part, a test of the electric motor alone (for example, resistance value measurement, insulation resistance test, withstand voltage test, surge test Etc.) and the inverter unit alone must be tested. However, if the conventional motor is connected inside the motor, it cannot be tested as it is assembled, and it is necessary to disassemble the motor and test it as a single motor.

[0020]

According to the first invention, a stator core is fixed to a frame integrally formed of a metal material such as aluminum by a bracket for supporting a bearing on the anti-load side by shrink fitting, etc., In a totally enclosed fan motor with a cooling fan attached to the rotating shaft on the anti-load side, an inverter with a power circuit and a control circuit in the space outside the two bearings that support the rotor and inside the frame It is configured such that a substrate having a hole through which a shaft passes is provided in the center of the substrate.

According to a second aspect of the present invention, the output power circuit and the control circuit of the inverter device are installed on a single metal substrate in the first aspect, and the metal substrate is made of a metal plate such as aluminum having the metal substrate adhered and fixed. The components are attached to a frame, the inverter device is hermetically sealed, and the inverter device is built into the totally enclosed fan motor.

According to a third aspect of the present invention, the output power circuit of the inverter device according to the first aspect of the present invention is substantially semicircular, the control circuit is also approximately semicircular, and the two substrates are substantially donut-shaped to form a metal such as aluminum. It is configured such that it is adhesively fixed to a plate-shaped component, attached to a frame, and the inverter device is hermetically sealed and built into the totally enclosed fan motor.

According to a fourth aspect of the present invention, an inverter device, in which the power circuit and the control circuit formed on the metal substrate are resin-molded into a substantially donut shape, is adhered and fixed to a metal plate-shaped component such as aluminum. It is configured such that it is mounted on a frame and the inverter device is hermetically sealed and built into the fully closed fan motor.

According to the fifth aspect of the invention, in an electric motor incorporating an inverter device, the inverter device is automatically started without operating the start switch by simply supplying power to the electric motor.

According to a sixth aspect of the present invention, the inverter device according to the fifth aspect of the present invention is configured so that the protective function in the event of an abnormality can be visually identified by fusing the fuse.

According to the seventh aspect of the present invention, in an electric motor incorporating an inverter device, three electric motor leads, three inverter input and three output leads are drawn into the electric motor terminal box, and a terminal block and a connector are provided in the electric motor terminal box. Alternatively, the leads are directly connected to each other.

According to an eighth aspect of the present invention, in the seventh aspect, the three leads for the inner motor of the nine leads pulled out to the terminal box for the motor and the three outputs of the inverter device are connected to the electromagnetic contactor,
The three inputs of the inverter device are those in which three power leads are connected by a terminal block and the electromagnetic contactor operates when the power leads are energized.

[0028]

According to the first aspect of the present invention, the shaft is penetrated through the center of the circuit board by the inverter having the power circuit and the control circuit in the space outside the two bearings supporting the rotor and inside the frame. By incorporating a board with holes to allow
Only commercial frequency flows through the power line connecting the power source and the motor.

According to the second aspect of the invention, the output power circuit and the control circuit of the inverter device are installed on a single metal substrate, and a metal plate-shaped component such as aluminum to which the metal substrate is adhesively fixed is attached to the frame. The inverter device is sealed.

According to the third aspect of the present invention, the output power circuit of the inverter device has a substantially semi-circular shape, and the control circuit has a substantially semi-circular shape as well. Adhesively fixed and attached to the frame, the output power section circuit and the control circuit can be manufactured separately.

According to the fourth aspect of the present invention, the inverter unit, in which the power circuit and the control circuit formed on the metal substrate are resin-molded into a generally donut shape, is adhesively fixed to a metal plate-shaped component such as aluminum and attached to the frame.

According to the fifth aspect of the invention, the inverter device is automatically started by operating the start switch only by supplying power to the electric motor.

According to the sixth aspect of the present invention, the protective function at the time of abnormality can be visually identified by fusing the fuse.

According to the seventh invention, the terminal block, the connector or the leads are directly connected in the electric motor terminal box.

According to the eighth invention, the three inner motor leads of the nine leads drawn out to the electric motor terminal box and the three inverter device outputs are connected to the electromagnetic contactor, and the three inverter device inputs are the power source. When three leads are connected by a terminal block and the power leads are energized, the magnetic contactor operates.

[0036]

【Example】

Example 1. The embodiment shown in the drawings will be described below. In FIG. 1, 21 is a stator core, 22 is a slot-wound coil provided in the stator core 21, 23 is a frame in which the stator core 21 is housed inside, 50 is an inverter device in which a power circuit and a control circuit are integrated, 30 Is a heat sink of the inverter device 50, and is attached to the frame 23. 25 is a rotor, 26 is a bracket for supporting the rotor 25, 27 is a fan connected to the rotor 25,
A cover 28 protects the fan 27.

Next, the operation and action of the present invention will be described. In the controller-integrated motor 20, a commercial power line serving as a drive power source is connected to a terminal block provided in a terminal box, and the other side is connected to an inverter device circuit input section. On the other hand, the lead coming from the inverter device is also connected to the terminal block, and the other lead is connected to the motor coil input lead.

The inverter device substrate is fixed to a component having a high thermal conductivity such as aluminum by adhesion or the like, and a hole is provided in the central portion so that the shaft penetrates. This component is mounted in a fully closed type so that the inverter device side is inside and the back side of the inverter device substrate faces outward. A cooling fan is attached to the tip of the penetrating shaft, and a fan effect is generated by the rotation of the electric motor, and cooling air flows from between the outer fan cover and the electric motor body.

For this reason, the inverter device is built in the frame of the electric motor, but in order to avoid the influence of the temperature inside the electric motor, an anti-load side bracket, which also serves as a shield plate, is provided between the motor coil and the built-in inverter device together with the frame. Produce with a frame. Since the inverter device is mounted so as to be located inside the frame but outside the anti-load side bracket, the temperature becomes lower than the temperature in the vicinity of the motor coil. The lead connecting the inverter device and the motor is connected by forming a hole in a part of the anti-load side bracket.

At this time, in the inverter device, the power circuit, which is a heating element, is formed on a substrate such as aluminum having a good thermal conductivity. A hole is provided at the center of the substrate so that the shaft penetrates, and the inverter device is cooled by an external fan attached to the shaft. Fins are often attached to the frame to improve heat dissipation. By mounting the inverter device on the side of the external fan, the inverter device can be cooled more effectively.

The inverter device is installed inside the frame, but outside the bracket on the anti-load side, and is connected to the inside of the motor by a partition plate, and the influence of heat generation of the motor is affected by cooling by a fan attached to the motor shaft. It is possible to provide a motor with a built-in inverter device with a small, fully-enclosed, fan-shaped motor.

Example 2. The embodiment shown in the drawings will be described below. In FIG. 2, 41 is a metal substrate of a common base on which each component of the inverter device 50 is mounted, 54 is a power circuit of the inverter device 50, and 55 is the inverter device 5.
0 is a control circuit, and 42 is a glass epoxy board on which a control circuit 54 is mounted. This inverter device substrate is used in the structure of the first embodiment.

Example 3. The embodiment shown in the drawings will be described below. In FIG. 3, 41 is a metal substrate having good heat dissipation, 54 is a power circuit of the inverter device 50, 55 is a control circuit of the inverter device 50, 42 is a glass epoxy substrate on which the control circuit 55 is mounted, 43 is a power circuit 54. It is a common base plate that serves as a common base for the mounted metal substrate 41 and the glass epoxy substrate 42 on which the control circuit 55 is mounted, and is attached to the heat dissipation plate 30. In this manner, the power unit and the control circuit unit of the inverter device are manufactured by using a substantially semicircular substrate, and the two substrates are finished into a donut-shaped metal substrate. This inverter device substrate is used in the structure of the first embodiment. In the third invention, in order to reduce the influence of the heat generation of the power circuit on the control circuit, the power circuit and the control circuit are each formed into a substantially semicircular shape, and the two substrates are formed into a metal plate-shaped component such as aluminum. It is characterized by being adhesively fixed, and the second mounting
Same as the invention of. Since the present invention also uses a single substrate, the axial dimension can be reduced.

Example 4. The embodiment shown in the drawings will be described below. In FIG. 4, 41 is a metal substrate on which the inverter device 50 is mounted, and 45 is a molding resin such as epoxy that protects the components of the inverter device 50. As shown in the figure, since the inverter device 50 is sealed with the mold resin, the insulation distance can be shortened and the size can be reduced. This molded inverter device is used in the structure of the first embodiment. In FIG. 5, reference numeral 45 is a molding resin such as epoxy that protects the components of the inverter device 50. Reference numeral 46 denotes a mold resin 45 mold sealing case. As a simplification of the case of molding, a case is shown in which the mold is poured into the inside of the resin case, but the same effect is obtained. Second,
The third and fourth inventions show a method of reducing the thickness of the inverter device to solve the second problem. The second invention is that the power unit circuit and the control circuit unit, which are heat generating units, are formed on a metal substrate. It is installed and adhesively fixed to a metal plate component such as aluminum, and fixed to a frame with the inverter device inside to make a fully enclosed electric motor. Since the opposite surface to which the power circuit is adhered is on the side of the external fan, heat dissipation is improved, so that abnormal heat is not transmitted to the control board and integration is possible. . Generally, since the power section circuit and the control circuit section have two stages, the dimension in the axial direction becomes large, but since the present invention uses one substrate, the dimension in the axial direction can be made thin.

A fourth aspect of the present invention molds the inverter device circuit board, which is a single substrate according to the second or third aspect, into a donut shape. Molding reduces the size and improves the moisture resistance. The inverter device needs to secure a space distance and a creepage distance from the container (in this case, an aluminum frame), but it is possible to shorten the distance to the container by insulating the mold. Also, by molding, the local temperature rise is suppressed. The temperature is averaged.

Example 5. Examples will be described below. In FIG. 6, 51 is a converter unit that rectifies alternating current to direct current, 52 is an inverter device that converts direct current into alternating current (set frequency), 53 is ON / OFF of an output element (for example, power transistor) of the inverter device 52. OF
In the control circuit section for controlling F, the control circuit voltage is obtained by a constant voltage circuit using the input voltage.

When the control voltage of the control circuit section 53 reaches a certain voltage, the control of the output transistor is automatically started, and the output is started in accordance with a preprogrammed frequency / voltage pattern.

A fifth aspect of the present invention is an improvement concerning start / stop of an electric motor with a built-in inverter device. Conventionally, even if a power source is wired to the electric motor, it does not start. Had to connect to the department. If the inverter device is automatically operated when the electric motor is supplied with electric power, the above operation is unnecessary. For this reason, in the inverter device, after power supply, the control circuit starts operating when the power supply voltage of the smoothing circuit reaches a certain voltage, and the inverter device is operated by increasing the frequency up to the preset frequency according to the programmed pattern. To solve it.

A sixth aspect of the present invention relates to a method for displaying an abnormality in an electric motor with a built-in inverter device. When the power supply is stopped due to an abnormality in the electric motor, it is impossible to display an alarm in the inverter device because the power supply voltage disappears. For this reason, a plurality of fuses are installed so that the details of the abnormality can be confirmed at the position of the blown fuse.

Example 6. Examples will be described below. This device automatically starts operation according to the fifth embodiment, but when there is an abnormality such as overvoltage or overcurrent, the output circuit is automatically opened so that no voltage is output. In this case, fuses that blow with a small current are attached to multiple alarm display output terminals in order to leave the cause of the stop. Therefore, at the time of abnormality, it can be determined by which fuse has blown.

Example 7. Examples will be described below. In FIGS. 7 and 8, 60 is a terminal box, 10 is an AC commercial power source, 11 is a lead wire for transmitting power of the commercial power source 10, 12 is a lead wire of the electric motor 20, and 62 is a lead wire 1.
A terminal block for fixing the terminals 1 and 12, a terminal box seat 61 for fixing the terminal block 62, and a terminal box lid 63 for protecting the terminal block 62.

The lead wire 11 is connected to the input portion of the inverter device via the terminal block 62 and is fed to the converter portion of the power portion. In addition, the lead wire drawn out from the output section of the inverter device section is connected to the motor coil input lead of the electric motor 20 via the terminal block 62 and is wound into the coil 2.
Powered to 2. Therefore, the electric motor coil input lead of the terminal block 62 is the electric motor alone.

In order to make it possible to test the electric motor alone, the seventh invention draws out three electric motor leads and three inverter device input and output leads into the electric motor terminal box, and a terminal block or a terminal block is provided inside the electric motor terminal box. Connect three power supply sources, three inverter device inputs, three inverter device outputs, and three motor coil input devices with a connector or the like. For the test of the electric motor alone, the three electric motor coil inputs can be cut off and the three electric motor coil inputs can be used to easily perform the electric motor alone test (resistance test, insulation resistance test, withstand voltage test, surge test, etc.). I can.

Example 8. Examples will be described below. FIG. 9 shows the arrangement in the terminal box, in which one terminal block 62 and one electromagnetic contactor 64 are arranged. An input terminal of a commercial power source as a drive power source is connected to the terminal block 62, and is electrically coupled to an inverter device input terminal. The lead wire 65 drawn out from the output unit of the inverter device is connected to the electromagnetic contactor 64, and the other end thereof is connected to the motor coil input unit. The operating coil of the electromagnetic contactor 64 is connected by a lead wire 65 from the input terminal of the inverter device, and when a voltage is applied to the commercial power source, the electromagnetic contactor 64 conducts and the electric motor 20 starts rotating. The eighth invention uses an electromagnetic contactor to cut off the three coils for inputting the motor coil in order to enable testing of the electric motor alone, and takes the operating power supply of the electromagnetic contactor from the power supply line. Therefore, when the electric motor with a built-in inverter device is not supplied with electric power, the electromagnetic contactor is disconnected, so that the test can be performed without removing the terminal for the motor coil input connected to the electromagnetic contactor. When testing the motor alone without using the electromagnetic contactor, it is necessary to cut off the three coils for motor coil input, and in the case of the terminal block, it is necessary to turn the screws and remove the three leads, and then tighten the screws again after the test. Met. In the case of a connector, the test could not be performed without a test connector in which the lead was previously pulled out to a connector of the same type as the mating connector.

[0055]

As described above, according to the first aspect of the invention, the circuit board is the inverter having the power circuit and the control circuit in the space outside the two bearings supporting the rotor and inside the frame. By incorporating a board with a hole that penetrates the shaft at the center of the power supply line, only the commercial frequency (50 Hz or 60 Hz) flows through the power supply line connecting the power supply and the motor, so that harmonic noise from the power supply line is generated. There is no such thing. Further, the distance between the output of the inverter device and the motor coil is very short, and the surge of the inverter device with a 400V input power source is small and an expensive surge filter or the like is unnecessary. Also,
Since an inverter device is built in the electric motor which is a metal container and sinusoidal voltage and current are supplied up to the electric motor, there is no possibility of radiating harmonic noise from the power supply line and causing other devices to malfunction. Furthermore, since the inverter device in the electric motor and the electric motor coil are connected to each other, the wiring length is very short, so that the occurrence of the inverter device surge can be small. It is necessary and can be supplied at a lower cost than when the inverter device and the electric motor are separately installed.

According to the second aspect of the present invention, since the substrate in which the power circuit and the control circuit of the control device are integrated is installed on the common metal substrate, the size of the inverter device can be shortened. In addition, since a control device having a simple structure and a small number of parts can be configured, it is possible to expect a reduction in the number of work steps and the like, so that an inexpensive electric motor with a built-in control device can be obtained.

According to the third aspect of the present invention, the power unit circuit of the control device mounted on the metal substrate and the control circuit of the control device mounted on the glass epoxy substrate are separately manufactured, and one sheet is manufactured later. Since the power section circuit and the control circuit can be inspected and adjusted in each manufacturing process, the yield is improved and the parts are commonly used.

According to the fourth aspect of the invention, since the control circuit is sealed with the molding resin, the control components mounted in the control circuit are protected from the environment such as humidity and the average heat distribution is increased due to the increase of the heat capacity. Resistance and vibration resistance are improved.

According to the fifth aspect of the invention, it is not necessary to come to the electric motor to press the start switch of the inverter device and to draw the start signal line. Since the inverter device automatically operates and the electric motor is started only by applying power to the electric motor terminal box, it can be used by the same operation method as a general electric motor.

According to the sixth invention, there is an effect that the content of the alarm can be confirmed even if the power supply is stopped and the control voltage of the inverter device is lost when the inverter device abnormally stops.

According to the seventh aspect of the invention, in order to check the operation failure of the electric motor with built-in inverter device, a test of the electric motor alone and a test of the inverter device without using the lead in the terminal box for the electric motor are made without disassembling the electric motor. Can be tested.
If, for example, a withstand voltage test (about 2000 V for 400 V class) is applied with the terminal block still connected, the inverter output transistor will be damaged, so it was necessary to electrically open both the motor and the inverter.

According to the eighth invention, since the electromagnetic contactor is opened at the same time when the power supply voltage is cut off, it is possible to test the motor alone and the inverter device alone without removing the screws in the motor terminal box. .

[Brief description of drawings]

FIG. 1 is a half sectional front view showing an induction motor according to an embodiment of the first invention.

FIG. 2 is a sectional view of a control device according to an embodiment of the second invention.

FIG. 3 is a plan view and a sectional view of a control device according to an embodiment of the third invention.

FIG. 4 is a sectional view of a control device according to an embodiment of the fourth invention.

FIG. 5 is a sectional view of a control device according to another embodiment of the fourth invention.

FIG. 6 is a front view in half section showing an induction motor according to an embodiment of the fifth invention.

FIG. 7 is a wiring diagram of a terminal block according to an embodiment of the sixth invention.

FIG. 8 is a wiring diagram of a terminal block according to an embodiment of the seventh invention.

FIG. 9 is a wiring diagram of a terminal block according to an embodiment of the eighth invention.

FIG. 10 is a block diagram of a conventional example.

FIG. 11 is a half cross-sectional front view showing an induction motor of a conventional example.

FIG. 12 is a cross-sectional view of a conventional inverter device alone (a cover is not shown).

[Explanation of symbols]

10 commercial power source, 11, 12 lead wire, 20 electric motor, 21 stator core, 22 coil, 23 frame, 25 rotor, 26 bracket, 27 fan,
28 cover, 30 heat sink, 41 metal substrate, 42
Glass epoxy substrate, 43 common base plate, 45 mold resin, 46 mold sealing case, 50 control device, 51
Converter part, 52 inverter device, 53 control circuit, 54 power part circuit, 60 terminal box, 61 terminal box seat, 62 terminal block, 63 terminal box lid, 64 electromagnetic contactor, 65 lead wire.

Claims (8)

[Claims] 1. A stator core is fixed to a frame, which is integrally formed of a metal material such as aluminum, with a bracket supporting a bearing on the anti-load side by shrink fitting, and a cooling fan is attached to a rotary shaft on the anti-load side. In the fully-closed fan motor, an inverter having a power circuit and a control circuit was provided in the space outside the two bearings that support the rotor and inside the frame, and a hole was provided in the center of the circuit board to penetrate the shaft. An electric motor with a built-in control device, which has a built-in board. 2. The output power circuit and control circuit of the inverter device are installed on a single metal substrate, and a metal plate-shaped component such as aluminum to which the metal substrate is adhesively fixed is attached to a frame to hermetically seal the inverter device. The electric motor with a built-in control device according to claim 1, wherein the electric motor is built in a totally enclosed fan motor. 3. The output power circuit of the inverter device has a substantially semi-circular shape, and the control circuit has a substantially semi-circular shape, and the two boards form a substantially donut shape, and are adhesively fixed to a metal plate-shaped component such as aluminum and attached to a frame. 2. The electric motor with a built-in control device according to claim 1, wherein the inverter device is hermetically sealed and built into the inside of the fully-enclosed fan motor. 4. An inverter device, in which a power circuit and a control circuit formed on a metal substrate are resin-molded into a generally donut shape, is adhesively fixed to a metal plate-like component such as aluminum, mounted on a frame, and the inverter device is hermetically closed. The electric motor with a built-in control device according to claim 1, wherein the electric motor is built in the fan motor. 5. An electric motor with a built-in control device, characterized in that, in an electric motor having a built-in inverter device, the electric power is supplied to the electric motor, and the inverter device is automatically started without operating a start switch. 6. The electric motor with a built-in control device according to claim 5, wherein the inverter device is provided with a protective function at the time of abnormality which can be visually identified by fusing the fuse. 7. In an electric motor having a built-in inverter device, three electric motor leads, three inverter input and three output leads are drawn out from the electric motor terminal box, and a terminal block, connector or leads are directly connected in the electric motor terminal box. An electric motor with a built-in control device characterized by the above. 8. A 9-lead inner motor lead drawn out to a motor terminal box and 3 inverter device outputs and 3 inverter device outputs are connected to a magnetic contactor, and 3 inverter device inputs and 3 power supply leads are terminal blocks. 8. The electric motor with a built-in control device according to claim 7, wherein the electromagnetic contactor is connected so that the electromagnetic contactor operates when the power supply lead is energized.