JPS6356145A - Protective device for generator - Google Patents

Abstract

PURPOSE:To detect the overheat of a winding securely and protect it, by a method therein a protective device is installed in a notched portion extending from an outer circumference of a stator core to the inside. CONSTITUTION:A notch 27 of V-like shape is formed on a stator core 3, and extends from outer circumference to inner diameter direction. Windings 4, 5 are wound on the stator core 3, and connected to terminals 6-8. The terminals 6-8 are installed on a terminal board 17, and connected electrically with a terminal receptacle of a terminal receptacle support 20. A protective device 22 is inserted in series to the terminal receptacle. When the terminal board 17 and the terminal receptacle support 20 are locked with a locking projection 18 by a locking hook 21, the protective device 22 abuts on the notch 27.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a protection device for an electric board whose output is less than IKW, and in particular, to ensure the protection and safety of a drive source incorporated in small appliances such as household electric appliances. 6 [Prior art] For motors with relatively small output, that is, motors with low output IKW, a heat-responsive type as shown in Japanese Patent Publication No. 37-4818 is used. A motor protection device was used, which was fixed to the motor windings, detected abnormal temperatures in the windings, and used a thermal response device to cut off the electrical circuit to the motor. 6 However, such a thermally responsive protection device was attached during the winding process of the electric motor, and then the electric motor was formed through processes such as varnishing the windings.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, since the protective device is fixed to the winding, it is necessary to adopt a structure in which the protective device is strongly tied to the coil end portion of the winding with thread or the like. Applying such a strong force to the windings causes force to be applied to the magnet wires forming the windings, causing damage to the magnet wires and failure of the layer sheet and the like. Additionally, after the windings have been fitted with a protector, they are usually treated with varnish to secure the windings and protector and to protect them from environmental conditions such as moisture. At this time, both the windings and the protection device are immersed in liquid varnish, so depending on the nature of the varnish, it is necessary to use an expensive protection device with a sufficiently airtight structure to prevent the varnish from penetrating into the inside of the protection device. . In such a varnish treatment process, the winding portion is also heated, and the heat resistance of the protective device must be able to withstand this heating temperature.
In this respect too, special requirements were often required for the protection devices.

In addition, the other device in which the electric motor is incorporated and used, for example,
Things like electric washers, dryers, well pumps, etc.
Even if motors with the same output are used, the temperature that must be protected by the motor's protection device will differ to protect the connected equipment, so motors that should originally be able to be used in common may not be able to be used in common. However, the number of varieties increased, which often led to problems in production management.

In recent years, with the spread of household electrical equipment and office equipment, many problems have arisen due to overheating, and prevention of overheating and burnout of electric motors is also an important issue. Considering these points, it is desirable to have a protection device that can disconnect the circuit from the power supply when the motor reaches a temperature limit that can maintain safety for each device in which the motor is used. The aim is to obtain a motor protection device that achieves this.

Means for Solving Problem C] To achieve the above objective, it is first necessary to avoid attaching this protective device to the coil ends of the windings of the motor. However, in order to do this, it is necessary to accurately detect when the windings overheat due to some abnormality in the motor. The idea is to take advantage of the notch and attach a protection device to this part in order to accurately detect the temperature of the winding.

In addition, this protection device is installed when the main body of the electric motor has completed all manufacturing processes and becomes a finished product.
As a result, the protection device is not exposed to varnish immersion or high-temperature drying steps during the manufacturing process of the electric motor, and there are no restrictions on the protection device. That is,
If this protection device is something like a temperature fuse that melts at a predetermined temperature, it cannot be used unless it has an operating temperature that is at least higher than the temperature during the drying process, and the temperature at which you want it to operate to protect the motor is particularly different. However, since the present invention is not affected by the temperature during the manufacturing process of the electric motor as described above, it is possible to sufficiently achieve the protection function of the electric motor. .

Furthermore, since the upper limit of the temperature at which the motor side should be protected and regulated varies depending on the configuration of the equipment to which the motor is installed, especially the materials used, etc. According to the method of the present invention, it is possible to Since the protection device is attached to the connection part of the power supply, a protection device with an arbitrary operating temperature can be selected. For this reason, the motor body side is manufactured so that it can be used commonly, and when installing this protective device, it is only necessary to appropriately select the specifications of the protective device on the side. In addition, since the motors are common, the purpose of standardization can be achieved.

[Effect]

First, the terminals of the windings of the motor are connected in the specified manner, and a plurality of terminals for energizing from an external power source are electrically insulated and fixed to the outer surface of the motor. A terminal block that supports a terminal block that engages with a terminal to establish electrical continuity is provided with a connecting part such that the support body mechanically engages with the terminal block and does not separate from the terminal block, and this terminal block is supported by A protective device is attached to the body, and when the protective device engages the terminal block with the support and the terminal block, the notch extending from the outer periphery of the stator core around which the stator windings of the motor are wound inward. By adopting a structure in which the protection device comes into contact with the winding, the temperature of the part close to the winding temperature can be accurately detected and the protection device can be activated.The protection device itself can be directly attached to the motor body to complete the motor. This prevents the protective device from malfunctioning or melting at temperatures during manufacturing.

In addition, since the protective device itself is attached to the power source of the main body, which is driven by an electric motor, the temperature of the protective device can be appropriately and easily set.

〔Example〕

An embodiment of the present invention will be described below. The embodiment of the present invention is an example in which the present invention is applied to a capacitor induction motor operated by a single-phase power supply. There is an auxiliary winding 5 disposed 90 parts apart in electrical angle from this, one end of both of these windings goes to a common terminal 6, the other end of the main winding 4 goes to a terminal 7, The other end of the winding 5 is connected to the terminal 8, the main winding a4 is directly excited by the power supply 1 via the terminal receivers 9, 10 and 11, and the auxiliary winding 5 is connected to the phase advance capacitor 1.
The rotor 14 is connected to the m source 1 via the m source 1 and is excited in phase to create an unbalanced two-phase rotating magnetic field, and is fixedly fixed through the shaft 13.
It generates rotational force. Reference numeral 15 designates an end bracket having a bearing 16 in the center, rotatably supporting the shaft 13, and clamping and fixing the stator core 3. The terminals 6, 7, and 8 are fixed to the stator core 3 via a terminal block 17 made of an insulating material, and the terminal block 17 is formed with at least one locking protrusion 18. A feature of the present invention is that the stator core 3 is provided with a V-shaped notch 27 extending from the outer periphery of the stator core 3 toward the inner diameter, as shown in Japanese Patent Publication No. 60-11534. This notch is provided on the inner diameter side of the stator core 3 and serves as a means for accessing the slot 19 around which the main winding 4 and the auxiliary winding 5 are wound. Terminal receivers 9, 10, and 11 that provide electrical continuity with the terminals 6, 7, and 8 are made of an insulating material and are fixed to the support 20, and the terminal blocks 17 are connected to the support 20. A locking hook 21 that locks with the locking protrusion 18 for mechanical connection is attached to the locking protrusion 1.
8, and the terminal block 17 and the terminal receiver are connected between the support body 2o. In this configuration, the terminal 6 and the corresponding terminal receiver 9 are common terminals that form an electric path to the power source 1 for both the main winding 4 and the auxiliary winding 5. Since communication with the power supply 1 will be cut off when the circuit is shut off, a protective device 22 such as a thermal switch or a temperature fuse that breaks the electrical circuit when the temperature exceeds a predetermined temperature is connected to the terminal receiver 9 and the lead on the power supply 1 side. It shall be inserted in series between the wire 23 and the wire 23. The other terminal receivers 10 and 11 are directly connected via lead wires 24 and 25 to the power supply 1 or capacitor 12 of the main body of the equipment to which the motor 2 is attached. The terminal holder is the support body 2
0 is integrally provided with a storage section 26 for storing and supporting the protection device 22, and the protection device 21 accommodated therein is configured to abut against a notch 27 of the stator core 3. In this case, the terminal block 17 and the terminal receiver of the protective device 22 come into contact with the notch 27 of the stator core 3 only when the support body 2o is connected with the locking hook 21.

Therefore, the terminal receivers 9, 10 and 11, the terminal receivers are connected to the support 20, the protector 22, the lead wires 23, 24 and 2.
Reference numeral 5 is a wiring from the device main body (not shown) driven by the electric motor 2, and is formed in a shape unique to the device.

Although this embodiment has been described above in the case of a capacitor induction motor, it can also be modified and applied to other single-phase induction motors, three-phase induction motors, etc.

〔Effect of the invention〕

As described above, the present invention makes it easy to detect the temperature of the windings by appropriately shaping the stator core 3 without directly attaching the protection device 22 to the main winding 4 or the auxiliary winding 5. V
It is possible to maintain excellent protection characteristics with relatively high sensitivity for detection by using the notch 27 facing in the inner diameter direction in the shape of a letter, and since the protection device is not fixed to the winding, the main winding A4 due to this Since unnecessary force is not applied to the auxiliary winding B5 and the auxiliary winding B5, failures such as layer short circuits of the winding can be prevented, and problems caused by varnish impregnation in the winding manufacturing process and protection device 22 in the drying process can be prevented. Since there is no overheating, the operating temperature of the protective device can be set to any desired temperature, which is an effective means for ensuring the safety of equipment. In addition, the protection device 22 is installed not on the motor 2 side but on the equipment driven by the motor 2, and is connected to the motor 2 at the end, so the temperature setting necessary for protecting the plate equipment can be set arbitrarily. Therefore, the electric motor 2 can be used in common and can be standardized, which has great industrial effects.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the entire motor including a motor equipped with a motor protection device and the mounting section of the protection device according to an embodiment of the present invention, Fig. 2 is a partial front view of the motor, and Fig. 3 is also a plan view, FIG. 4 is an electrical connection diagram when the present invention is applied to a capacitor induction motor, and FIG. 5 is a perspective view of the installation of the power supply circuit connection device and protection device, which are the main parts of the present invention. This shows that. 1...Power supply, 2...Electric motor, 3...Stator core,
4... Main winding, 5... Auxiliary winding, 6, 7.8...
Terminal, 9゜10.11...Terminal receiver, 12...Capacitor, 13...Shaft, 14...Rotor, 15
... End bracket, 16... Bearing, 17...
Terminal block, 18... Locking protrusion, 19... Slot, 2
0...The terminal holder is a support, 1st port/ 噌Inijigo r/3 ・Eve (
Giant craftsmanship: ri; mi, d giant 5; 2, -9-motive 20
1. Training area 4th district

Claims (1)

[Claims] 1. A V-shaped notch 27 extending from the outer periphery of the stator core 3 toward the inner diameter, terminals 6, 7, and 8 connected to the ends of the plurality of windings wound around the stator core 3, and fixing these. a terminal block 17 that is insulated and fixed to the stator core 3; terminal holders 9 that form the same number of pairs that are electrically connected to the terminals 6, 7, and 8;
10 and 11, a terminal receiver support 20 that mutually supports these terminal receivers, and lead wires 23, 24, and 25 electrically connected to the terminal receivers, a circuit that can intermittent the energization of the electric motor 2 from the power source 1. A protective device 22 capable of opening an electric circuit at a predetermined temperature is inserted in series between the terminal block 17 and the lead wire, and the terminal block 17 and the terminal block support 20 are connected in series.
A protection device for an electric motor, characterized in that a protection device 22 comes into contact with a notch 27 when the motor is locked by a locking protrusion 18 and a locking hook 21.