JPH0615497Y2 - Pole conversion motor with cable connector - Google Patents

Description

[Detailed description of the device]

[Field of Industrial Application] The present invention relates to a pole-changing motor for switching a main circuit by directly connecting a power cable by providing a cable connector at a connection portion with the power cable. [Prior Art] FIG. 5 shows a conventional electric motor with a cable connector. In the figure, 1A indicates an electric motor, 2 indicates a connection box as an attachment member of the cable connector 3 attached to the electric motor 1, and an L-shaped attachment portion is provided.
The cable connector 3 is a cable connector fixed part set (hereinafter, referred to as a fixed part set) 3 attached to the part of the connection box 2.
1 and a cable connector movable part set (hereinafter, referred to as a movable part set) 32 that is connected to the fixed part set 31 by screwing or the like and is fixed to the mounting part 21 with a screw or the like.
2 is provided with a handle 321 for easy attachment and detachment. Reference numeral 4 is a power cable attached to the movable part set 32 of the cable connector 3. Reference numeral 5 denotes a protective cover that restricts the space for removing the movable portion 32 of the cable connector 3, and as shown in FIG. 6, has a mounting portion 51 for mounting to the connection box 2 with a screw or the like, and a flange 52. Reference numeral 6 denotes a signal generator attached to the connection box 2 and, for example, detects a contact of the flange 52 of the protective cover 5 and generates a different signal. That is, this signal generator 6 is an interlock signal generator, which generates a signal of logical value [1] when the protective cover 5 is attached to the junction box 2 and a logical value when it is removed.

The signal [0] is generated. FIG. 7 shows the operation block of this electric motor.
Reference numeral 7 is a power switch, 8 is an overcurrent protection relay, 9 is a restraint protection relay, 10 is a main power circuit of the electric motor 1, and a closing signal S _ON of the power switch 7 and an output S _S of the interlock signal generator 6 are AND. When it is introduced into the circuit 11 and S _S is [1], the connection command signal S S is sent to the main power supply circuit 10.
_{Send SS} . In addition, the interlock signal generator 6
The inversion output S _R by the inverter INV, the cutoff signal S _OFF of the power switch 7, the output S _C of the overcurrent protection relay 8, the output S _H of the restraint protection relay 9 are passed through the OR circuit 12 and the main power supply circuit 10 is given a cutoff command. Given as signal S _RS . In this configuration, when attaching or detaching the cable connector 3, first, the protective cover 5 is detached.
When the holding cover 5 is removed, the output of the interlock signal generator 6 is

Since it becomes [0], S _R becomes [1], and regardless of whether the power switch 7 is turned on or off, the cutoff command signal S _RS is generated and the main power supply circuit 10 is cut off. While removing the protective cover 5, the signal S _S

Since it is [0], even if the power switch 7 is erroneously turned on, the connection command signal S _SS is not generated and there is no danger of the main power circuit 10 being connected. When the protective cover 5 is attached after the cable connector is attached / detached, the signal S _S becomes [1]. Therefore, when the power switch 7 is turned on, the connection command signal S _SS is generated and the main power circuit 10 can be connected. It becomes a state. [Problems to be Solved by the Invention] In the motor with cable connector, the connecting portion between the fixed portion set 31 and the movable portion set 32 of the cable connector 3 is covered with the protective cover 5, and the attachment / detachment of the protective cover 5 is an interlock condition. Although the main power supply circuit 10 is connected and disconnected, when the cable connector mounting mechanism including this protective cover is applied to the pole number conversion motor, the power supply cables are connected to the high speed side and the low speed side of the motor stator. The only way to confirm that the motor is connected to the correct side is by visual inspection, and the main circuit of the motor may be connected while the connection is incorrect. This invention has been made to solve the above-mentioned conventional problems, and it is possible to reliably prevent erroneous connection of the power cable, and to accurately check the connection state of the power cable without removing the protective cover. An object is to provide a pole number conversion motor with a cable connector that can be used. [Means for Solving Problems] In order to achieve the above-mentioned object, the present invention has a protective cover,
At least one side of the left and right side plates has a baffle portion that extends toward the other side plate while leaving a space for pulling out the cable connector movable portion set between the left and right side plates. [Operation] In this invention, when the protective cover is attached with the baffle part on the side where the movable part of the cable connector is located, the baffle part hits the movable part and interferes with the mounting of the protective cover. If the protective cover in this position cannot be attached, it is possible to know whether the movable portion is connected correctly when the protective cover is attached by defining that the movable portion is erroneously connected. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a three-phase pole number conversion motor,
As shown in FIG. 4, it has a stator winding structure composed of a low speed side stator winding 13 and a high speed side stator winding 14, and as shown in FIG. Reference numeral 15 is each fixed portion 31 of the low speed side fixed portion set (connector cable fixed portion set) 31L, and terminal 16 of the high speed side stator winding 14 is a high speed side fixed portion set (connector cable fixed portion set) 31H. Is connected to each fixed part 31 of the. U, V of the fixed part set 31L,
As shown in FIG. 3, the three W-phase fixing portions 31 and the three U-, V-, and W-phase fixing portions 31 on the high-speed side are mounted in a horizontal row in the junction box 2. As shown in FIG. 2, the protective cover 50 has a back plate 50A,
In addition to having the left side plate 50B and the right side plate 50C, it has a shape having a lower baffle portion 50D and an upper baffle portion 50E serving as a detection portion, and has a mounting portion 51 and a flange portion 52 similar to the protective cover 5 of FIG. Are attached to the front edges of the left and right side plates 50B and 50C, with the left and right sides reversed in the vertical relationship. The lower baffle portion 50D is a plate body in this embodiment,
The drawing space 60 extends from the left side plate 50B to the right side plate 50C and also extends to the front edge of the cover to define a drawing space 60 between the left side plate 50B and the right side plate 50C. That is, the disturbing part 50
D is a state in which the protective cover 50 is attached to the connection box 2, the front edge reaches the vicinity of the L-shaped mounting portion 21 of the connection box 2, and the side edge on the right side plate 50C is between the right side plate 50C. , Fixed part 31
It has an area defining a space 60 in which a set of three movable parts 32 connected to L can be drawn out. The disturbing part 50E is
Although it is a plate having the same area as the baffle portion 50D, it extends from the right side plate 50C to the left side plate 50B to define a space 60 between the left side plate 50B and the movable portions 32 from which the three movable parts 32 can be drawn. Differ in that there is. The protective cover 50 is provided with a sign indicating the cover mounting posture, and in this example, name plates "low speed side" and "high speed side" are attached to the back plate 50A. Incidentally, in FIG. 3, each fixing portion 31 of the fixing portion set 31H is
Is shown with the protective cap 3A fitted. In this configuration, when the set of the movable parts 32 is connected to the fixed part 31 of the fixed part set 31L on the low speed side (the connected state of FIG. 3), the protective cover 50 has the attitude shown in FIG. Upside down, that is, the letters "high-speed side" and "low-speed side" on the name plate look upside down from the postures shown in the figure, and "low-speed side"
When the attachment box 2 is attached to the junction box 2 in a state in which the letters are upside down and the "high-speed side" can be read in the correct posture, the obstacle 50E hits the set of the movable portions 32 and interferes, so the protective cover 50
Cannot be attached to the junction box 2, but if the protective cover 50 is turned upside down and brought into the posture shown in the drawing, the obstruction portion 5
Since 0D can enter the space below the protective cap 3A, the connection box 2 can be attached to the obstruction portion 50D. When the protective cover 50 is attached to the junction box 2,
The output S _{S of the} interlock signal generator 6 is [1]
Therefore, when the power switch 7 of the operation block shown in FIG. 7 is turned on, the connection command signal S _SS is generated and the main power supply circuit 10 can be connected. That is, when the pole number conversion should be on the low speed side,
When the set of movable parts 32 is connected to the fixed part set 31H,
When trying to attach the protective cover 50 in a posture in which the letters "low speed side" on the name plate are in the correct posture, the obstruction portion 50D hits the movable portion 32, so that the protective cover 50 cannot be attached to the junction box 2. From this, it is detected that the movable portion 32 is erroneously connected. In the above embodiment, the baffle portions 50D and 50E are arranged above and below the protective cover 50, and the protective cover 50 is vertically inverted. However, one baffle portion extending from one side plate to the other side plate side is provided. May be formed, and
The obstruction portion is not limited to the plate body, and the movable portion 32 such as a protrusion that is erroneously connected when the protective cover 50 is attached.
It suffices that it engages with and interferes with the attachment of the protective cover 50. [Effect of the Invention] As described above, the present invention provides the cable connector by providing the baffle portion that engages with the movable portion and prevents the protective cover from being attached when the movable portion is erroneously connected. Since it is possible to know the correctness or incorrectness of the connection during installation of the protective cover, the correctness or incorrectness of the cable connector connection can be detected easily and surely, and the motor main circuit can be connected to the power cable with the incorrect connection. Such a situation can be prevented, and it can be easily confirmed whether the power cable is connected to the high speed side or the low speed side.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view of a protective cover in the above embodiment, FIG. 3 is a view showing an arrangement state of cable connectors in the above embodiment, and FIG. The figure which shows the winding structure of the electric motor in the said Example,
FIG. 5 is a vertical sectional view showing a conventional example, FIG. 6 is a perspective view of a protective cover in the conventional example, and FIG. 7 is a view showing an operation block in the conventional example. In the figure, 1 ... motor, 2 ... connection box, 3 ... cable connector, 31 ... cable connector fixing part, 32
...... Cable connector moving part, 50 ...... Protective cover, 5
0B, 50C ... Side plate, 50D, 50E ... Obstacle. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] 1. A pole number conversion motor having a high speed side stator winding and a low speed side stator winding, a cable connector fixing portion set to which terminals of the high speed side stator winding are connected, and the low speed side stator winding. A connection box fixedly holding the cable connector fixed part set to which the wire terminals are connected in a horizontal row and fixed to the electric motor frame, a cable connector movable part set connected to either one of the both cable connector fixed part sets, Number of poles with a cable connector that is detachably fixed to the connection box and that has a protective cover that restricts the space for attaching and detaching the cable connector movable part between the connection box and the space for drawing out the cable connector movable part assembly on the lower side In the conversion motor, the protective cover is provided on at least one side of the left and right side plates, leaving a space for pulling out the cable connector movable portion set between the protective cover and the other side plate. Cable connector number of poles conversion motor and having a baffle portion extending to the side. 2. A pole number conversion motor with a cable connector according to claim 1, wherein the baffle portion is provided on one side plate side of the cover upper portion and one side plate side of the cover lower portion.