MXPA00000788A - Plug for changing an operating condition of an electric motor - Google Patents

Abstract

Provided is a plug for changing an operating condition of an electric motor. The plug includes at least one electrical contact. A support structure includes at least one electrical contact. The plug is electrically connectable to the support structure in at least first and second positions in which at least one plug electrical contact engages at least one support structure electrical contact. The plug and the support structure engage each other independently of the electrical connection between the electrical contacts. The independent engagement means ensures that the plug may only be positioned in a predetermined number of suitable positions and may not be positioned in an unacceptable position which the plug would be positionable absent the independent engagement means. Indicating means are provided to further ensure that the proper electrical connection is made depending on the desired operating condition of the electric motor.

Description

CONNECTOR TO CHANGE A CONDITION OF OPERATION OF AN ELECTRICAL MOTOR FIELD OF THE INVENTION The present invention relates, generally, to electric motors and, more particularly, to a connector for changing an operating condition, such as, the voltage of an electric motor.

BACKGROUND OF THE INVENTION Electric motors that have varying operating conditions are well known in the art. Said electric motor that is capable of operating in two different voltages is described in the U.S. patent. No. 3,983,428. The '428 patent disengages a three-terminal connection receptacle wherein push-fit connectors can be connected to any left and center terminal, 120 volt operation, or to the center and right terminals, 240 volt operation. The movement of the push-fit connector changes the combination of the circuit from a configuration parallel to a series configuration, thereby changing the voltage applied to the rest of the circuit from 120 volts to 240 volts. The patent of E.U.A. No. 3,231, 767 describes another electric motor that has varying operating conditions. Patent 767 describes a circuit selection switch for changing operating conditions, such as the operating voltage and rotation, of a single phase motor. The '767 patent describes a terminal panel fixedly mounted in a motor frame and interconnected to incoming power terminals and motor windings. A removable connector is releasably coupled to the terminal panel in any of the four positions, each of which establishes a particular voltage and rotational circuit connection.

BRIEF DESCRIPTION OF THE INVENTION It is desirable to provide electric motors that are capable of being used under different operating conditions. In order to accommodate various operating conditions, it is desirable to provide a structure having electrical contacts designed to electrically connect with other electrical contacts of a connector. The structure and the connector include indicators that indicate the starting operation condition of an engine. However, it may be desirable to limit the number of operating conditions that can be varied for any given engine. For example, it may be desirable to provide an electric motor wherein only the variable operating condition is the voltage current. However, for manufacturing reasons, such as speeds and production cost, it may sometimes be desirable to provide a structure and connector that includes a number of electrical contacts so that they are capable of being used in an engine with several operating connections. variables Therefore, depending on the general configuration of an engine, a connector can be placed in a structure in any number of different positions, some of which are acceptable positions and some of which are unacceptable positions. Acceptable positions designate those positions that vary an operating condition of an engine and unacceptable positions designate those positions where the electrical contacts of a connector can be connected to the electrical contacts of a structure but, due to the configuration of the engine, the engine is not functional in a proper way. A problem with the interchangeable connector means of the '428 patent is that there is no indication as to which combination of push-fit connectors and terminals provide a high or low voltage scale. Another problem with the apparatus described in the '428 patent is the possibility of connecting a push-fit connector to a wrong terminal or, as stated otherwise, placing the push-fit connector in an unacceptable position. Therefore, if one or both push-fit connectors are placed in the wrong terminals, the current can flow improperly through the electric motor and the motor will not work according to its design. The circuit selection connector of the '767 patent can only be placed in one of the four acceptable positions. There are no unacceptable positions. The engine described herein does not include extra electrical contacts in the terminal panel and the connector that allows additional positions in which the connector can be placed in the terminal panel to accommodate other operating conditions if it is desirable to provide such conditions. In this way, the motor described in the '767 patent is limited to the change of voltage and rotational direction of the motor. A new connector is necessary to change an operating condition in an electric motor, said connector is easy to use and eliminates the problems mentioned so far. In addition, a connector is required that eliminates confusion about which operating condition an electric motor starts. It is also necessary a connector that eliminates the possibility of incorrectly connecting the electrical contacts in an electric motor that, if the above happens, prevents the electric motor from working properly. Furthermore, a connector designed to be placed in a number of predetermined acceptable positions in a structure of an electric motor is required in which said connector is not placed in an unacceptable position in the structure in which the connector can be placed except for the cooperation of the structure connector according to the present invention. In one embodiment of the present invention, a support structure fixed in relation to a motor housing includes at least one electrical contact. A connector having at least one electrical contact is coupled to the support structure of the electrical contact, so that the connector is electrically connected to the support structure in at least the first and second positions in which at least one electrical contact of The connector is coupled to at least one electrical contact support structure.

The support structure and the connector are coupled together independently of the electrical contacts, so that the contactor can be placed only in a number of predetermined acceptable positions including the first and second positions, and so that the connector can not be placing in an unacceptable position in which an electrical connector contact can be coupled to an electrical contact of support structure and in which the connector can be placed in any position except for the coupling of the connector of the support structure independently of the contacts electric In a preferred embodiment, the non-electrical projection is provided in any support structure or connector and a non-electrical quality is provided in the other support structure and connector. In order to select a particular operating condition, the non-electrical projection engages the non-electrical depression when the connector is electrically coupled to the support structure. Even more preferably, the connector includes two non-electrical projections having a non-electrical depression with each other and the support structure having at least two separate non-electrical projections. One of the non-electrical projections of the support structure engages the non-electrical depression of the connector when the connector is electrically coupled to the support structure, so that the particular operating condition is initiated. The other non-electrical projection of the support structure engages the non-electrical depression of the connector when the connector is electrically coupled to the support structure, so that another particular operating condition is initiated. In another embodiment of the present invention, a terminal connector changes a voltage speed in an electric motor. A fixed terminal panel relative to a motor housing includes at least one terminal panel electrical contact. A terminal connector having at least one terminal connector electrical contact is coupled with at least one terminal panel electrical contact, so that the terminal connector can be electrically connected to the terminal panel in at least the first and second positions where the less a terminal connector electrical contact is coupled with an electrical contact of the terminal panel. When the terminal connector is connected to the terminal panel in the first position, a pair of windings that is electrically connected to the power supply contained in the motor is in parallel to create a low voltage power supply. When the terminal connector is connected to the terminal panel in the second position, the same windings are in series to create a high voltage power supply. The terminal panel and the terminal connector engage each other independently of the electrical contacts so that the terminal connector can be placed only in a number of predetermined acceptable positions, including the first and second positions. The terminal connector can not be placed in an unacceptable position in which an electrical contact terminal connector can be coupled with an electrical terminal panel contact and in which the terminal connector can be placed in any position except for the coupling of the terminal connector and the terminal panel independently of the electrical contacts. In yet another embodiment of the present invention, a terminal connector includes at least two electrical contacts of the terminal connector. A terminal panel includes at least three electrical contacts of the terminal panel. One of the electrical contacts of the terminal panel is an electrical contact of the terminal panel for use in a low or high voltage capacity. For the low voltage current, the terminal connector, which houses the electrical contacts of the terminal connector, is connected to the terminal panel so that an electrical contact of the terminal connector is connected to one of the electrical contacts of the terminal panel, and a second electrical contact of the terminal connector is connected to the common terminal panel electrical contact. For the high voltage current, the terminal connector is connected to the terminal panel so that the first electrical contact of the terminal connector is connected to the electrical contact of the common terminal panel, and the other electrical contact of the terminal connector retained in the terminal connector is not connects to no electrical contact of the terminal panel. The electrical contacts of the terminal panel for low or high voltage are preferred in line and each being preferably separated to about 0.635 cm. This configuration allows a quick change of connection. If a low voltage current is desired, the terminal connector is placed in the electrical contacts of the appropriate terminal panel as previously described. If a high-voltage current is desired, the terminal connector simply rises from the low-voltage position and moves 0.635 cm to one side and engages in the electrical contact of the appropriate terminal panel as described above. The movement of the terminal connector from the low voltage position to the high voltage position reconfigures the motor windings from a parallel configuration (low voltage) to a series configuration (high voltage). A single movement of the terminal connector to the alternating position on the terminal panel easily changes the voltage current of the motor. In a preferred embodiment, a non-electrical projection is provided on any terminal panel or terminal connector and a non-electrical vacuum is provided on the other terminal panel and the terminal connector. In order to select the desired voltage, the non-electrical projection is coupled with the non-electrical depression when the terminal connector is electrically coupled to the terminal panel. Even more preferably, the terminal connector includes two non-electrical projections having a non-electrical depression therebetween and the terminal panel having at least two separate non-electrical projections. One of the non-electrical projections of the terminal panel is coupled to the non-electrical depression of the terminal connector when the terminal connector is electrically coupled to the terminal panel, so that a particular voltage current is initiated. The other non-electrical projection of the terminal panel is coupled with the non-electrical depression of the terminal connector when the terminal connector is electrically coupled to said terminal panel, so that another particular voltage current is initiated. In any of the above embodiments, the aforementioned electrical contacts can be male or female electrical contacts.

In any of the above embodiments, the support structure, the terminal panel, the terminal panel or connector and the terminal connector may include indicators showing where the connector should be located with respect to the support structure and showing where it should be. locating the terminal connector with respect to the terminal panel, i.e. the appropriate electrical connection between the respective electrical contacts, for an operating condition of an electric motor, i.e., a given voltage current. Accordingly, a feature of the present invention is to provide an electric motor that has the ability to operate at either of two power supply voltages, one of which can be substantially twice as much as the other, to provide a switching device. of voltage. Another feature of the present invention is to provide a reliable voltage change device that eliminates virtually any confusion as to which combination of electrical contacts provides the necessary voltage current. Another feature of the present invention is to provide a voltage changing device that is simple and inexpensive to manufacture and, at the same time, solves the aforementioned problems. Still another feature of the present invention is to provide a connector for changing an operating condition in an electric motor so that the connector is not improperly positioned in a motor that, if allowed, prevents the motor from operating in a correct manner.

Still another feature of the present invention is to provide a connector for changing an operating condition in an electric motor. Said operating condition may include, for example, changing the rotation of an electric motor in a clockwise direction to the counterclockwise direction. After reviewing the material herein, those skilled in the art will appreciate the manner in which the present invention is capable of changing any number of operating conditions of an electric motor, said operating conditions being generally known. Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view, partially in section, of a motor including a voltage changing device according to the present invention. Figure 2 is a top view of a terminal panel assembly as shown in Figure 1. Figure 3 is a front view of the terminal panel assembly of Figure 2. Figure 4 is a perspective view of a terminal connector. as shown in figure 1.

Figure 5 is a top view showing the terminal connector connected to the terminal receptacles suitable for a low voltage current. Figure 6 is a top view showing the terminal connector connected to the terminal receptacle suitable for a high voltage current. Fig. 7 is a schematic view showing portions of a main field winding of the motor connected in parallel in a power supply. Fig. 8 is a schematic view showing portions of the main field winding of the motor connected in series in the power supply. Before the embodiments of the invention are explained in detail, it should be understood that the invention is not limited in its application to the details of construction and to the arrangements of components described in the following description or illustrated in the drawings. The invention may have other modalities or it may be carried out or carried out in various ways. Likewise, it should be understood that the phraseology and terminology used herein is for description purposes and should not be viewed as limiting. The use of "includes" and "comprises", and variations thereof in the present refer to the compression of the articles listed below and equivalents thereof as well as additional articles. The use of "consists of" and variations thereof only refers to the compression of the items listed below.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES An electric motor 10, partially in section, is illustrated in figure 1 in the drawings. The electric motor 10 includes a housing 12 and an end frame 14 attached thereto. The stator 16 is fixed relative to the housing 12 and end frame 14 and an arrow 18 rotates about the motor shaft 20. The arrow 18 supports the rotor 22 for rotation relative to the stator 16. The indicators 24 and 26 of Windings represent the main stator windings of the electric motor 10. As is commonly known in the art, the motor 10 is electrically connected to a power supply (not shown) by electrical contacts 28 (Figure 7-8). Figure 1 further shows a device for changing operating condition, such as a voltage changing device 30, according to the present invention. The operating condition change device includes a support structure 32 and a connector 34. The voltage changing device 30 includes a terminal panel 32 and a terminal connector 34. The cover 36 is positioned relative to the end frame 14 for covering the voltage changing device 30 and other components typical of an electric motor not shown or described. With reference to Figures 1-3, the terminal panel 32 includes a back plate 38 and a base 40. The back plate 38 is generally perpendicular to the base 40. The terminal panel 32 can be manufactured from any number of suitable materials known to those skilled in the art, however, injection molded plastic is particularly suitable for use with the subject invention. The terminal panel 32 is preferably fixed to the end frame 14 by screws 42 which extend through respective holes 44 found in the base 40. Still with reference to FIGS. 1-3, the base 40 of the terminal panel 32 includes, preferably in line, terminal contacts 46, 48 and 50. The contacts 46 and 48 extend above the base 40 from a common bottom terminal plate 52 which is conventionally secured to the base 40 by a screw 54. The contact portion 56 extends downward from the lower plate 52 through the base 40. The contact portion 56 is electrically connected to a terminal wire 58 which is electrically connected to another end of the winding portion 24 (Figures 7-8). . The terminal panel contact 50 extends above and below the base 40, so that the contact portion 60 of the contact 50 is below the base 40. The contact portion 60 is electrically connected to a cable terminal 62 which is electrically connected to the other end of winding portion 24 (Figures 7-8). Still with reference to FIGS. 1-3, terminal contacts 64 and 66, common bottom plate 68, screw 70 and contact portion 72, which are joined together, are also located in the base 40 of the terminal panel 32, preferably in line. to the terminal panel 32 in the same manner as the similar components described above. The contact portion 72 is electrically connected to the terminal wire 74 which is electrically connected to one end of the winding portion 26 (Figures 7-8).

It should be noted that not all contacts 46, 48, 50, 64 and 66 are necessary to reach the suitable electrical circuits described herein. However, for manufacturing purposes, as described in the summary section herein, such contacts are provided. With reference to Figures 1-3, the back plate 38 has a lower section 76 and an upper section 78. The lower section 76 of the back plate 38 extends generally perpendicular to the base 40. The upper section 78 extends upward to an angle of the lower section 76 and away from the terminal panel 32. For further explanation, when viewing the backing plate 38 from one side (see Figure 1), the backup plate 38 somewhat has a boomerang shape. Still with reference to Figures 1-3, a plurality of ribs or projections 80 extend from the lower section 76 of the back plate 38 of the terminal panel 32 to the contacts 46, 48, 50, 64 and 66. The ribs 80 they are located between the back plate 38 and the contacts 46, 48, 50, 64 and 66. Between each pair of ribs of the plurality of ribs 80 respective depressions 82 are located. The meaning of ribs 80 and depressions 82 will be explained below. together with the description of figures 5-8. Still referring to Figures 1-3, the terminal panel 32 includes an indicator 84. The indicator 84 includes arrows 86 and 88, markings or instructions for 115 volts 90, markings or instructions for 230 volts 92, and a division line 94. The division line 94 is placed on the back plate 38 directly up from the terminal panel contact 50. The arrow 86 and the low voltage instructions 90 are located on one side of the division line 94 and the other arrow 88 in the high-voltage instructions 92 they are located on the other side of the division line 94. The function of the indicator 84 will be further explained below along with the description of Figures 5-8. With reference to Figures 1 and 4, the terminal connector 34 can be made of various materials known to those skilled in the art, however, injection molded plastic works well with the principles of the present invention. The terminal connector 34 is generally rectangular in shape but may have any suitable shape in accordance with the present invention. The terminal connector 34 includes an upper surface 96, a lower surface 98, and a side 100. Ribs or projections 102 projecting from side 100. Preferably the ribs 102 are positioned substantially adjacent to the bottom surface 98. The overall length of the ribs 102 may be greater or less than that shown. A depression 104 is located between the ribs 102. The meaning of ribs 102 and depression 104 will be explained later with reference to the description of Figures 5-8. The upper surface 96 includes lips 106 that extend outwardly and generally perpendicularly to said respective sides of the connector 34. The lips 106 are used to control the terminal connector 34 with respect to the terminal panel 32 as will be more apparent below. The upper surface 96 has an indicator 108. The indicator 108 includes an arrow 110 pointing to the side 100 of the connector 34. The function of the indicator 108 will be explained later along with the descriptions of Figures 5-8.

With reference to Figure 1, the terminal cables 112 and 114 are connected to the female electrical contacts 116 and 118 respectively of the terminal connector, which are housed in the terminal connector 34. The terminal cable 112 is electrically connected to one end of the winding portion 26 (FIG. 7) and the terminal wire 114 is electrically connected to another end of the winding portion 26 (FIG. 7). It should be noted that in the illustrative embodiment, the connector is injection molded around the portions of the cables and the contacts. In another embodiment, a plastic connector is provided and the upper part of the connector is left open. In this type of connector, the contacts coupled to the terminal wires slide into the openings of the connector and the top of the connector is filled with an acrylic glue or other suitable material. In still another embodiment, the contacts coupled to the terminal cables are adjusted in the appropriate places found in a connector. The manner of placing the contacts in a terminal connector can be carried out in any number of ways consistent with the present invention. Figures 5-8 show the relationship between terminal connector 34 and terminal panel 32 for low voltage motor current (Figures 5 and 7), and high voltage motor (Figures 6 and 8). One of the features of the present invention is to provide an electric motor that has the ability to operate at any of the two power supply voltages, one of which can be substantially twice as much as the other, by providing a power change device. voltage as described herein.

With reference to Figures 5 and 7, when it is desired to connect the portion of windings 24 and 26 in parallel in the power supply, the terminal connector 34 is electrically connected to the terminal panel 32 in the following manner. The terminal connector 34 is placed on the terminal panel 32 so that an electrical contact 118 (Figure 1) housed in the connector 34 and coupled to the termination cable 114 is electrically connected to the electrical contact 48 of the terminal panel, and the other electrical contact 116 (Figure 1) housed in the connector 34 and attached to the terminal cable 112 is electrically connected to the electrical contact 50 of the terminal panel. In this first position, the depression 104 of the connector 34 receives a rib 80 from the terminal panel 32. Likewise, in this first position, the indicator 84 of the terminal panel and the indicator 108 of the terminal connector are aligned. Specifically, the arrow 110 on the terminal connector 34 points to the arrow 86 associated with the low voltage instructions 90 of the terminal panel 32 to indicate that the motor is ready for a low voltage power supply, or 115 volts. With reference to Figures 6 and 8, when it is desired to connect the portion of windings 24 and 26 in series with the power supply, the terminal connector 34 is electrically connected to the terminal panel 32 in the following manner. The terminal connector 34 is connected to the terminal panel 32 so that an electrical contact 118 (FIG. 1) housed in the connector 34 and coupled to the terminal cable 114 is electrically connected to the electrical contact 50 of the terminal panel, and the other electrical contact 116. (Figure 1) housed in the connector 34 and attached to the terminal cable 112 remains housed by the connector 34 but is not electrically connected to any electrical contact of the terminal panel. In this second position, the depression 104 of the connector 34 receives a rib 80 from the terminal panel 32. Likewise, in this second position, it is aligned in the indicator 84 of the terminal panel and the indicator 108 of the terminal connector. Specifically, the arrow 88 associated with the high voltage instructions 92 of the terminal panel 32 points toward the arrow 110 at the terminal connector 34 to indicate that the motor is ready for a high voltage power supply, or 230 volts. The terminal panel 32 and the terminal connector 34 are coupled to each other in two independent ways. First, certain electrical contacts of the terminal panel are electrically connected to certain electrical contacts of the terminal connector depending on the desired voltage current, as described above. Secondly, the ribs and depressions of the terminal panel and the ribs and depressions of the terminal connector are coupled in a certain way, also depending on the desired voltage current. Although the terminal panel and the terminal connector have been described with reference to the particular physical structure, the terminal panel and the terminal connector may include various male or female contacts or connectors in accordance with the principles of the present invention. It is desirable that the terminal panel and the terminal connector engage each other independently of the respective electrical contacts, so that the terminal connector can be placed only in a number of predetermined acceptable positions that include the positions previously described and associated with a current of low or high voltage. Likewise, it is desirable that the terminal connector not be placed in an unacceptable position in which one of the electrical contacts of the terminal connector is coupled to one of the electrical contacts of the terminal panel and in which the terminal connector can be placed, except for the coupling of the ribs and depressions. For example, electrical contacts 64 and 66 of the terminal panel are provided for fabrication and other reasons but do not provide an acceptable position for a connector, so that an operating condition of the motor can be changed. The electrical contacts 116 and 118 can not be connected to the contacts 64 and 66 because the projections 80 on the terminal panel 32 do not engage with the depression 104 of the connector 34 if an attempt is made to locate the connector 34. in the terminal panel 32 in said position. It should be apparent that, for the independent coupling of terminal panel 32 and terminal connector 34 by the observed ribs and depressions, electrical contacts 116 and / or 118 can be placed in contacts 64 and 66, which represents an unacceptable position. because the motor 10 is not designed to operate with said connection. The above description of the present invention has been presented for purposes of illustration and description. In addition, the description is not intended to limit the invention to the form described herein. For example, the voltage changing device can be replaced with other support structures and connectors to change any number of operating conditions an electric motor in accordance with the principles of the present invention as described in the brief description of the invention in the present. Accordingly, variations and modifications equivalent to the foregoing teachings, in the experience or knowledge of the relevant art, are within the scope of the present invention. The embodiments described herein are also intended to explain the best known modes for carrying out the invention and to enable others skilled in the art to use the invention as such, or other modalities and with various modifications required by the particular applications or uses of the invention. present invention. It is intended that the appended claims be made to include the alternative embodiments up to a scope permitted by the prior art. Several characteristics of the invention are described in the following claims.

Claims (17)

NOVELTY OF THE INVENTION CLAIMS

1. - An electric motor having an axis, said electric motor comprising: a housing; a stator fixed relative to said housing; an arrow rotatable around the axis; a rotor supported by said arrow for the rotation thereof in relation to said stator; a support structure which is fixed relative to said housing and which has at least one electrical contact; and a connector having at least one electrical contact that engages said electrical contact of the support structure, such that said contactor is electrically connected to said support structure in at least the first and second positions in which at least one The electrical contact of the connector is coupled to at least one electrical contact of the support structure, said support structure and said connector are coupled to each other independently of said electrical contacts, so that said connector is placed only in a number of predetermined acceptable positions, including said first and second positions, and in such a manner that said connector is not placed in an unacceptable position in which an electrical contact of connector can be coupled with an electrical contact of structure in support in which said connector can be placed, except for said coupling said connector and said support structure independently of said with electrical touches.

2. - The electric motor according to claim 1, further characterized in that said electrical contacts are male or female electrical contacts.

3. The electric motor according to claim 1, further characterized in that at least one projection is in said support structure and said connector, and wherein at least one depression is in the other support structure and the other connector , so that when at least one electrical connector contact is coupled to at least one electrical contact of the support structure, at least one projection engages at least one depression.

4. The electric motor according to claim 1, further characterized in that said support structure and said connector include two projections, and wherein the other support structure and the other connector include a depression, so that when said connector is electrically connects said support structure in said first position, one of said projections engages said depression, and so that when said connector is electrically connected to said support structure in said second position, said other projections are coupled with said depression .

5. The electric motor according to claim 1, further characterized in that said support structure and said connector include respective indicators, so that in said first position and said second position, said indicators are aligned with each other.

6. - The electric motor according to claim 5, further characterized in that said support structure indicator includes two arrows placed on said support structure and said connector indicator includes an arrow placed on said connector, so that in said first position and in said second position, said arrow in said connector points to one of the two arrows in the support structure.

7. The electric motor according to claim 6, further characterized in that said support structure indicator also includes a series of marks, said marks being located in said support structure, so that in said first position, said indicators indicate that the engine is ready for an operating condition and, in said second position, said indicators indicate that the engine is ready for another operating condition.

8. The electric motor has an axis, said electric motor comprises: an end frame; a fixed stator with reaction to said end frame; an arrow rotatable around the axis; a rotor supported by said arrow for the rotation thereof with respect to said stator; a pair of windings that are electrically connected to a power supply; a terminal panel that is fixed relative to said end frame and having at least one terminal panel electrical contact, and a terminal connector having at least one electrical contact of the terminal connector engageable with at least one electrical contact of the terminal panel, so that said terminal connector is electrically connected to said terminal panel in at least the first and second positions in which at least one electrical contact of the terminal connector is coupled to an electrical contact of the terminal panel, so that when said terminal connector is connects said terminal panel in said first position, said windings are in parallel to create a low voltage power supply and, so that when said terminal connector is connected to said terminal panel in said second position, said windings are in series to create a high voltage power supply, said terminal panel and said terminal connector are they couple together independently of said electrical contacts, so that said terminal connector is placed only in a number of predetermined acceptable positions including said first and second positions, and in such a manner that said terminal connector is not placed in an unacceptable position in which an electrical contact of the terminal connector is not coupled with an electrical contact of the terminal panel and in which said terminal connector could be positionable except for said coupling of said terminal connector and said terminal panel independently of said electrical contacts.

9. The electric motor according to claim 8, further characterized in that said electrical contacts are male or female electrical contacts.

10. The electric motor according to claim 8, further characterized in that at least one projection is in one of said terminal panel and said terminal connector, wherein at least one depression is in the other terminal panel and in the other terminal connector, so that when at least one electrical contact of the terminal connector is coupled with at least one electrical contact of the terminal panel, at least one projection engages at least one depression.

11. The electric motor according to claim 8, further characterized in that said terminal panel and said terminal connector include two projections, and wherein the other terminal panel and the other terminal connector include a depression, so that when said terminal connector is electrically connected to said terminal panel in said first position, one of said projections engages said depression, and so that when said terminal connector is electrically connected to said terminal panel in said second position, the other projections are coupled with said depression .

12. The electric motor according to claim 8, further characterized in that said terminal connector includes at least two electrical contacts of the terminal connector, and wherein said terminal panel includes at least three electrical contacts of the terminal panel wherein one of said contacts Electrical terminal panel is an electrical contact of the common terminal panel, so that when said terminal connector is connected to said terminal panel in said first position, a first electrical contact of the terminal connector of at least two electrical contacts of the terminal connector is connected electrically to one of the electrical contacts of the terminal panel and a second electrical contact of the terminal connector of at least two electrical contacts of the terminal connector is electrically connected to said electrical contact of the common terminal panel, and so that when said terminal connector is connected to said terminal panel in said second posi tionsaid first electrical contact of the terminal connector is electrically connected to said electrical contact of the common terminal panel.

13. The electric motor according to claim 8, further characterized in that said terminal panel and said terminal connector include respective indicators, so that in said first position and in said second position said indicators are aligned with each other.

14. The electric motor according to claim 13, further characterized in that said indicator of the terminal panel includes two arrows placed on said terminal panel and said indicator of the terminal connector includes an arrow placed on said terminal connector, so that in said first position and in said second position, said arrow on said terminal connector points to one of the two arrows on said terminal panel.

15. The electric motor according to claim 14, further characterized in that said indicator of the terminal panel further includes low voltage markings and high voltage markings, said markings are located on said terminal panel so that in said first position, said Indicators indicate that the motor is ready for low voltage power supply and, in said second position, said indicators indicate that the motor is ready for high voltage power supply. 16.- The electric motor comprises: a housing that has an axis; an end frame mounted in said housing; a stator fixed relative to said end frame; an arrow rotatable around the axis; a rotor supported by said arrow for the rotation thereof in relation to said stator; a pair of windings that are electrically connected to a power supply; a terminal panel which is fixed relative to said end frame and which has at least three electrical contacts of the terminal panel in line, one of the three electrical contacts of the terminal panel being an electrical contact of the common terminal panel, said terminal panel including a indicator including low voltage markings and high voltage markings, each marking positioned on one side of the dividing line, said dividing line being placed on said terminal panel; a terminal connector having an indicator, said terminal connector further includes at least two electrical contacts of the terminal connector which engage said electrical contacts of the terminal panel, such that said terminal connector is electrically connected to said terminal panel in a number of positions predetermined acceptable ones that include at least the first and second positions, so that when said terminal connector is connected to said terminal panel in said first position, a first electrical contact of the terminal connector of at least two electrical contacts of the terminal connector is electrically connected to one of said electrical contacts of the terminal panel and a second electrical contact of the terminal connector of at least two electrical contacts of the terminal connector is electrically connected to said electrical contact of the common terminal panel and, said windings are in parallel to create a supply of low energy voltage, and such that when said terminal connector is connected to said terminal panel in said second position, said first electrical contact of the terminal connector is electrically connected to said electrical contact of the common terminal panel and, said windings are in series to create a high voltage power supply, said markings being located on said terminal panel, so that in said first position, said indicators indicate that the motor is ready for low voltage and, in said second position, said indicators indicate that the motor is ready for high voltage; a projection on said terminal panel and said terminal connector; and a depression in the other terminal panel and in the other terminal connector, so that when said terminal connector is electrically connected to said terminal panel at any of said predetermined number of acceptable positions, said projection engages said depression, and so that said terminal connector is not placed in an unacceptable position in which an electrical contact of the terminal connector can be coupled with an electrical contact of the terminal panel in which said terminal connector can be placed, in any position different from said acceptable positions, said projection and said depression cause an interference between said terminal connector and said terminal panel. 17. The electric motor according to claim 16, further characterized in that said electrical contacts are male or female electrical contacts.