CA2612141A1 - Traction system for lifts, escalators, moving walkways and aerogenerators, which is equipped with an asynchronous motor, and an asynchronous motor for said traction system - Google Patents
Traction system for lifts, escalators, moving walkways and aerogenerators, which is equipped with an asynchronous motor, and an asynchronous motor for said traction system Download PDFInfo
- Publication number
- CA2612141A1 CA2612141A1 CA002612141A CA2612141A CA2612141A1 CA 2612141 A1 CA2612141 A1 CA 2612141A1 CA 002612141 A CA002612141 A CA 002612141A CA 2612141 A CA2612141 A CA 2612141A CA 2612141 A1 CA2612141 A1 CA 2612141A1
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- motor
- stator
- rotor
- asynchronous motor
- escalators
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 239000010949 copper Substances 0.000 claims abstract description 10
- 241000555745 Sciuridae Species 0.000 claims description 11
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 230000010363 phase shift Effects 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/04—Driving gear ; Details thereof, e.g. seals
- B66B11/043—Driving gear ; Details thereof, e.g. seals actuated by rotating motor; Details, e.g. ventilation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
- H02K17/20—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having deep-bar rotors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Escalators And Moving Walkways (AREA)
- Elevator Control (AREA)
- Induction Machinery (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to a traction system for lifts, escalators, moving walkways and aerogenerators, which is equipped with an asynchronous motor comprising a copper bar rotor and having a low starting current and a high performance. The invention also relates to the aforementioned asynchronous motor, the nominal speed and power of which can be scaled by varying the supply voltage and the frequency in order to obtain power of between 2 and 2000 kW in different motor models depending on the physical shape and connection thereof, whereby speed is proportional to the programmed frequency.
Description
TRACTION SYSTEM FOR LIFTS, ESCALATORS, MOVING WALKWAYS AND
AEROGENERATORS WHICH IS EQUIPPED WITH AN ASYNCHRONOUS
MOTOR, AND AN ASYNCHRONOUS MOTOR FOR SAID TRACTION SYSTEM
OBJECT OF THE INVENTION
The object of this invention is a traction system for lifts, escalators, moving walkways and aerogenerators, that includes an asynchronous motor with a squirrel cage rotor with low start-up current and high performance; as well as said asynchronous motor, the power and operating speed of which are scalable with variable frequency and input voltage so as to obtain between 2 and 2000 kW of power in different motor models depending on their physical size and their connection, the speed being proportional to the programmed frequency.
BACKGROUND OF THE INVENTION
Lift apparatuses and escalators and moving walkways activated by electrical motors present specific problems, such as the large number of start-ups and shutdowns per unit of time, and cargo variation. Up to now, this problem has been solved through the use of geared motor groups.
In addition, the energy generators applied to wind-driven generators both for the start-up of the assembly and operating by way of the generator require a revolution multiplier.
The invention is related to traction systems activated by low-slippage and high-torque asynchronous motors, this activating being unusual up to the present in this field. The asynchronous motor is so-called because the rotating magnetic field generated by the stator is compensated by the one created by induction in the rotor with some delay in the rotation that brings about slippage against one another and which, in the motors built with the aforementioned technique, is of an approximate magnitude of 16% of the rotation speed of the magnetic field created by the stator in nominal conditions. In addition, the asynchronous motors of the aforementioned techniques have a high start-up intensity of approximately 1.5 to 3 times the nominal rating and use high current densities, normally of about 10 A/mm2.
AEROGENERATORS WHICH IS EQUIPPED WITH AN ASYNCHRONOUS
MOTOR, AND AN ASYNCHRONOUS MOTOR FOR SAID TRACTION SYSTEM
OBJECT OF THE INVENTION
The object of this invention is a traction system for lifts, escalators, moving walkways and aerogenerators, that includes an asynchronous motor with a squirrel cage rotor with low start-up current and high performance; as well as said asynchronous motor, the power and operating speed of which are scalable with variable frequency and input voltage so as to obtain between 2 and 2000 kW of power in different motor models depending on their physical size and their connection, the speed being proportional to the programmed frequency.
BACKGROUND OF THE INVENTION
Lift apparatuses and escalators and moving walkways activated by electrical motors present specific problems, such as the large number of start-ups and shutdowns per unit of time, and cargo variation. Up to now, this problem has been solved through the use of geared motor groups.
In addition, the energy generators applied to wind-driven generators both for the start-up of the assembly and operating by way of the generator require a revolution multiplier.
The invention is related to traction systems activated by low-slippage and high-torque asynchronous motors, this activating being unusual up to the present in this field. The asynchronous motor is so-called because the rotating magnetic field generated by the stator is compensated by the one created by induction in the rotor with some delay in the rotation that brings about slippage against one another and which, in the motors built with the aforementioned technique, is of an approximate magnitude of 16% of the rotation speed of the magnetic field created by the stator in nominal conditions. In addition, the asynchronous motors of the aforementioned techniques have a high start-up intensity of approximately 1.5 to 3 times the nominal rating and use high current densities, normally of about 10 A/mm2.
These drawbacks can be avoided by way of synchronous motors, although they also bring about disadvantages, such as the use of large permanent magnets, their high cost, problems related to their handling and their deterioration due to heating.
In order to overcome these drawbacks a proportional multipolar investigation has been carried out, that is, starting from an initial produced and functional size, other sizes have been developed in order to achieve greater power, always in a proportional manner, that is, scaled, from the initial prototype, from different motors powered by way of an electronic assembly with voltage input frequency splitter and diagrams have been drawn up of their functioning as a result of the variation of different parameters such as voltage and intensity values, wiring, frequency and number of poles.
As a result of this proportional multipolar investigation the asynchronous motor of the present invention has been obtained, which offers the following advantages:
a) The asynchronous motor starts up without peaking in intensity consumption.
b) It has a very low slippage, of approximately 8%.
c) High performance.
d) Low current density that does not surpass 6 A/mm2, which guarantees a uniform and unsaturated magnetic field.
e) Low degree of heating, since in the electrical winding a 55 C is rarely exceeded, with a high rhythm of 180 connections/hour and maximum output torque.
f) As a consequence of the above, a very long working life.
BRIEF DESCRIPTION OF THE DRAWINGS
The disclosure provided below will be better understood with reference to the attached drawings in which:
Fig. 1 shows an expanded perspective view of the stator and the rotor without coiling or copper rods, respectively;
Fig. 2 shows a side view of the rotor where the arrangement of the copper bars and the squirrel cage rings are illustrated;
Fig. 3 shows a side view of the carcass of the asynchronous motor with a section separated in order to illustrate its construction better;
In order to overcome these drawbacks a proportional multipolar investigation has been carried out, that is, starting from an initial produced and functional size, other sizes have been developed in order to achieve greater power, always in a proportional manner, that is, scaled, from the initial prototype, from different motors powered by way of an electronic assembly with voltage input frequency splitter and diagrams have been drawn up of their functioning as a result of the variation of different parameters such as voltage and intensity values, wiring, frequency and number of poles.
As a result of this proportional multipolar investigation the asynchronous motor of the present invention has been obtained, which offers the following advantages:
a) The asynchronous motor starts up without peaking in intensity consumption.
b) It has a very low slippage, of approximately 8%.
c) High performance.
d) Low current density that does not surpass 6 A/mm2, which guarantees a uniform and unsaturated magnetic field.
e) Low degree of heating, since in the electrical winding a 55 C is rarely exceeded, with a high rhythm of 180 connections/hour and maximum output torque.
f) As a consequence of the above, a very long working life.
BRIEF DESCRIPTION OF THE DRAWINGS
The disclosure provided below will be better understood with reference to the attached drawings in which:
Fig. 1 shows an expanded perspective view of the stator and the rotor without coiling or copper rods, respectively;
Fig. 2 shows a side view of the rotor where the arrangement of the copper bars and the squirrel cage rings are illustrated;
Fig. 3 shows a side view of the carcass of the asynchronous motor with a section separated in order to illustrate its construction better;
Fig. 4 shows a view of the X-X' section of Fig. 3, where the shape of the stator and the carcass of the motor is seen;
Fig. 5 shows the characteristic torque-angular speed curve of the asynchronous motor of the invention;
Fig. 6 shows the characteristic intensity-angular speed curve of the asynchronous motor of the invention;
Fig. 7 shows the characteristic intensity-torque curve of the asynchronous motor of the invention; and Fig. 8 shows the characteristic start-up-angular speed curve of a standard asynchronous motor or of a synchronous motor and of an asynchronous motor according to this invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
The asynchronous motor of the invention is disclosed below, which is specified based on a preferred embodiment of the same for 2 to 20 kW of power used in lifts.
Fig. 1 illustrates an expanded perspective view of the stator 1 and of the rotor 2 of the asynchronous motor showing only the magnetic plates that they are composed of with the corresponding slots for inserting the coiling into stator 1, not shown, and the squirrel cage rods 21 and rings 22 in the rotor as can be seen in Fig. 2 that shows a side view of rotor 2.
The main characteristics of the asynchronous motor of the present invention with reference to its physical parameters are the following:
- Short-circuited rotor 2 formed by the squirrel cage of copper rods with a number preferably between 54 and 76, and more preferably of 66 in the preferred embodiment.
The number of rods of rotor 2 is proportional to the number of slots in stator 1 in an approximate proportion of 90% of the former with respect to the latter. The squirrel cage is made up of 21 copper rods with a 5 x 16 mm crossways section, which are inclined 8 with respect to the parents of the ideal cylinder formed by the exterior surface of the drum in squirrel cage. The squirrel cage is closed by way of two circular 22 copper rings, also with a 5 x 16 mm crossways section, the interior of which the 21 rods are welded to. The diameter of the rotor 2 in the preferred embodiment is of 280 mm. The thickness of the magnetic plate bundle that the rotor 2 forms, in which the copper squirrel cage is inserted, designated with the letter A in Figs. 1 and 2, and which is equivalent to the magnetic plate thickness of the stator 1, also designated with the letter A in Figs. 1 and 3, is of between 80 and 300 mm, depending on the power of the motor.
The magnetic plates that make up the rotor 2 have the shape of a circular crown, their exterior surface being slotted in an axial direction for the insertion of the inclined 21 copper rods and with a single threading or necking in their interior so that in them a rib of the axis of the motor, not shown, and both elements rotate, the rotor 2 and the axis, solidariously.
In Figs. 1, 3 and 4 the shape of the stator 1 is shown. The magnetic plates 11 that comprise it, have a square shape with cut off, arched corners, so that they can be inserted in a cast iron cylindrical carcass 12 that supports both the stator 1 and the rotor 2. The width and height of the magnetic plates 11 of the stator are of 385 mm, 20%.
The plates that form the stator 1 are joined together to form a bundle by way of 8 sticks that pass through the boreholes 13 made on the periphery of the plates with a quantity of 12 and that also affix it to the cast iron rings 12 that surround the stator 1. In the centre of the plates there is a circular gap that defines the interior surface of the stator 1 with slots 14 parallel to the axis of the circular gap. In the preferred embodiment the number of slots 14 is preferably between 60 and 84, and more preferably is 72, necessarily being a multiple of 12 in every case. The thickness of the bundle of plates of the stator 1 is, as mentioned earlier A with the limits that were indicated. The air gap 15 measures 0.4 mm 0.1 mm.
The physical consecution of the stator assembly, forming a single bundle of magnetic nucleus between two rings of cast iron, in order to absorb the reaction to the working torque of the motor, is carried out by way of passing screw in a number of around 8, which perforate all of the assembly from one end to the other, where they are stretched.
The cast iron rings have an exterior diameter of 452 mm 20% in the preferred embodiment.
As regards the electrical characteristics of the asynchronous motor, it should be indicated that:
- the stator 1 is multipolar with such a number of poles that in the preferred embodiment winding is carried out for 12 poles. The current density in both the stator 1 and the rotor 2 is very low and does not surpass 6 A/mm2, which guarantees a uniform magnetic field and prevents saturation.
- the asynchronous motor with the aforementioned characteristics has a very low slippage of around 8% with respect to the synchronous speed, which is a significant improvement over the figures of synchronous motors of the previous technique, the figure of which is around 16%. On the other hand, the fact that the air gap is of only 0.4 mm 1 mm, the low slippage and low current density used and other constructive and input characteristics make the asynchronous motor of the invention have high performance and low losses due to heating because it has been proven that in the stator coiling the temperature of 55 C is not exceeded functioning in conditions of maximum output torque and with a high rhythm of connections of 180 per hour.
Figures 5, 6 and 7 show different characteristic curves of the functioning of the motor such as the torque-angular speed curve, intensity-angular speed curve and intensity-torque curve;
Fig. 8 shows the start-up intensity curves of a conventional asynchronous or synchronous motor currently in use, where one can observe the high value of la of the start-up intensity and how the intensity decreases to reach as low as the nominal rating In for that operating speed, that is, the intensity from start-up until the operating speed is a growing function of the angular speed of the motor, its initial value being zero and continuing to be always less than or equal to the nominal rating In at the aforementioned operating speed.
This characteristic represents and important advantage of the asynchronous motor of the invention because it eliminates the input line transients, but it especially increases the efficiency of the motor and prevents the need for special protection elements for the start-up/shutdown contact units or for the electronic circuits designed for this purpose.
This characteristic is most useful in applications such as elevating apparatuses where such operations are carried out continuously.
The asynchronous motor of the invention is specifically designed for each application depending on the load and the rating speed, and with specific input in current and frequency. With other values applied, the motor does not work. In accordance with multipolar dimensioning and construction, the asynchronous motor does or does not work; it stops producing an unacceptable level of noise, having a high level of consumption and not having a working torque, and instead works perfectly with surprising results, since the motor powered with a frequency splitter can reach the desired speed in the same way as a synchronous motor of permanent magnets that is much more expensive, always offering speed control in closed loop by way of an encoder. Any decrease in speed due to asynchronism is compensated for electronically with a minimum frequency increase, thus reaching an equivalent speed to that of synchronism.
Furthermore, acting over the motor construction characteristics, such as the number of slots in the rotor and stator, the coiled of the latter, its physical dimensions and providing the resulting asynchronous motor with the adequate voltage and frequency, with the corresponding phase shift between adjoining poles in accordance with the number of said poles, results in obtaining two important advantages, the selection of both the nominal rotation speed within a wide margin and the motor output power, that make it possible to apply this motors to lifts, escalators and moving walkways with power from 2 kW to 20 kW, and to generators of energy for aerogenerators for the start up of the generator equipment eliminating the usual multiplier component with power of up to 2000kW, although for this latter power figure it is required to increase the diameter of the stator to 2000mm and the thickness of the bundles of magnetic plates of the stator 1 and of the rotor 2 up to 1000mm.
Furthermore, acting over the motor construction characteristics, such as the number of slots in the rotor and stator, stator coil, its physical dimensions and providing the resulting asynchronous motor with the adequate voltage and frequency, with the corresponding phase shift between adjoining poles in accordance with the number of said poles, results in obtaining two important advantages, the selection of both the nominal rotation speed within a wide margin and the motor output power, that make it possible to apply this motors to lifts, escalators and moving walkways with power from 2 kW to 20 kW, and to energy generators for aerogenerators for the start up of the equipment in generatory mode eliminating the usual multiplier component with power of up to 2000kW, although for this latter power figure it is required to increase the diameter of the stator 1 to 2000mm and the thickness A of the bundles of magnetic plates of the stator 1 and of the rotor 2 up to 1000mm.
Fig. 5 shows the characteristic torque-angular speed curve of the asynchronous motor of the invention;
Fig. 6 shows the characteristic intensity-angular speed curve of the asynchronous motor of the invention;
Fig. 7 shows the characteristic intensity-torque curve of the asynchronous motor of the invention; and Fig. 8 shows the characteristic start-up-angular speed curve of a standard asynchronous motor or of a synchronous motor and of an asynchronous motor according to this invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
The asynchronous motor of the invention is disclosed below, which is specified based on a preferred embodiment of the same for 2 to 20 kW of power used in lifts.
Fig. 1 illustrates an expanded perspective view of the stator 1 and of the rotor 2 of the asynchronous motor showing only the magnetic plates that they are composed of with the corresponding slots for inserting the coiling into stator 1, not shown, and the squirrel cage rods 21 and rings 22 in the rotor as can be seen in Fig. 2 that shows a side view of rotor 2.
The main characteristics of the asynchronous motor of the present invention with reference to its physical parameters are the following:
- Short-circuited rotor 2 formed by the squirrel cage of copper rods with a number preferably between 54 and 76, and more preferably of 66 in the preferred embodiment.
The number of rods of rotor 2 is proportional to the number of slots in stator 1 in an approximate proportion of 90% of the former with respect to the latter. The squirrel cage is made up of 21 copper rods with a 5 x 16 mm crossways section, which are inclined 8 with respect to the parents of the ideal cylinder formed by the exterior surface of the drum in squirrel cage. The squirrel cage is closed by way of two circular 22 copper rings, also with a 5 x 16 mm crossways section, the interior of which the 21 rods are welded to. The diameter of the rotor 2 in the preferred embodiment is of 280 mm. The thickness of the magnetic plate bundle that the rotor 2 forms, in which the copper squirrel cage is inserted, designated with the letter A in Figs. 1 and 2, and which is equivalent to the magnetic plate thickness of the stator 1, also designated with the letter A in Figs. 1 and 3, is of between 80 and 300 mm, depending on the power of the motor.
The magnetic plates that make up the rotor 2 have the shape of a circular crown, their exterior surface being slotted in an axial direction for the insertion of the inclined 21 copper rods and with a single threading or necking in their interior so that in them a rib of the axis of the motor, not shown, and both elements rotate, the rotor 2 and the axis, solidariously.
In Figs. 1, 3 and 4 the shape of the stator 1 is shown. The magnetic plates 11 that comprise it, have a square shape with cut off, arched corners, so that they can be inserted in a cast iron cylindrical carcass 12 that supports both the stator 1 and the rotor 2. The width and height of the magnetic plates 11 of the stator are of 385 mm, 20%.
The plates that form the stator 1 are joined together to form a bundle by way of 8 sticks that pass through the boreholes 13 made on the periphery of the plates with a quantity of 12 and that also affix it to the cast iron rings 12 that surround the stator 1. In the centre of the plates there is a circular gap that defines the interior surface of the stator 1 with slots 14 parallel to the axis of the circular gap. In the preferred embodiment the number of slots 14 is preferably between 60 and 84, and more preferably is 72, necessarily being a multiple of 12 in every case. The thickness of the bundle of plates of the stator 1 is, as mentioned earlier A with the limits that were indicated. The air gap 15 measures 0.4 mm 0.1 mm.
The physical consecution of the stator assembly, forming a single bundle of magnetic nucleus between two rings of cast iron, in order to absorb the reaction to the working torque of the motor, is carried out by way of passing screw in a number of around 8, which perforate all of the assembly from one end to the other, where they are stretched.
The cast iron rings have an exterior diameter of 452 mm 20% in the preferred embodiment.
As regards the electrical characteristics of the asynchronous motor, it should be indicated that:
- the stator 1 is multipolar with such a number of poles that in the preferred embodiment winding is carried out for 12 poles. The current density in both the stator 1 and the rotor 2 is very low and does not surpass 6 A/mm2, which guarantees a uniform magnetic field and prevents saturation.
- the asynchronous motor with the aforementioned characteristics has a very low slippage of around 8% with respect to the synchronous speed, which is a significant improvement over the figures of synchronous motors of the previous technique, the figure of which is around 16%. On the other hand, the fact that the air gap is of only 0.4 mm 1 mm, the low slippage and low current density used and other constructive and input characteristics make the asynchronous motor of the invention have high performance and low losses due to heating because it has been proven that in the stator coiling the temperature of 55 C is not exceeded functioning in conditions of maximum output torque and with a high rhythm of connections of 180 per hour.
Figures 5, 6 and 7 show different characteristic curves of the functioning of the motor such as the torque-angular speed curve, intensity-angular speed curve and intensity-torque curve;
Fig. 8 shows the start-up intensity curves of a conventional asynchronous or synchronous motor currently in use, where one can observe the high value of la of the start-up intensity and how the intensity decreases to reach as low as the nominal rating In for that operating speed, that is, the intensity from start-up until the operating speed is a growing function of the angular speed of the motor, its initial value being zero and continuing to be always less than or equal to the nominal rating In at the aforementioned operating speed.
This characteristic represents and important advantage of the asynchronous motor of the invention because it eliminates the input line transients, but it especially increases the efficiency of the motor and prevents the need for special protection elements for the start-up/shutdown contact units or for the electronic circuits designed for this purpose.
This characteristic is most useful in applications such as elevating apparatuses where such operations are carried out continuously.
The asynchronous motor of the invention is specifically designed for each application depending on the load and the rating speed, and with specific input in current and frequency. With other values applied, the motor does not work. In accordance with multipolar dimensioning and construction, the asynchronous motor does or does not work; it stops producing an unacceptable level of noise, having a high level of consumption and not having a working torque, and instead works perfectly with surprising results, since the motor powered with a frequency splitter can reach the desired speed in the same way as a synchronous motor of permanent magnets that is much more expensive, always offering speed control in closed loop by way of an encoder. Any decrease in speed due to asynchronism is compensated for electronically with a minimum frequency increase, thus reaching an equivalent speed to that of synchronism.
Furthermore, acting over the motor construction characteristics, such as the number of slots in the rotor and stator, the coiled of the latter, its physical dimensions and providing the resulting asynchronous motor with the adequate voltage and frequency, with the corresponding phase shift between adjoining poles in accordance with the number of said poles, results in obtaining two important advantages, the selection of both the nominal rotation speed within a wide margin and the motor output power, that make it possible to apply this motors to lifts, escalators and moving walkways with power from 2 kW to 20 kW, and to generators of energy for aerogenerators for the start up of the generator equipment eliminating the usual multiplier component with power of up to 2000kW, although for this latter power figure it is required to increase the diameter of the stator to 2000mm and the thickness of the bundles of magnetic plates of the stator 1 and of the rotor 2 up to 1000mm.
Furthermore, acting over the motor construction characteristics, such as the number of slots in the rotor and stator, stator coil, its physical dimensions and providing the resulting asynchronous motor with the adequate voltage and frequency, with the corresponding phase shift between adjoining poles in accordance with the number of said poles, results in obtaining two important advantages, the selection of both the nominal rotation speed within a wide margin and the motor output power, that make it possible to apply this motors to lifts, escalators and moving walkways with power from 2 kW to 20 kW, and to energy generators for aerogenerators for the start up of the equipment in generatory mode eliminating the usual multiplier component with power of up to 2000kW, although for this latter power figure it is required to increase the diameter of the stator 1 to 2000mm and the thickness A of the bundles of magnetic plates of the stator 1 and of the rotor 2 up to 1000mm.
Claims (5)
1. Traction system for lifts, escalators, moving walkways and aerogenerators, of the kind which comprise driving by means of electrical motor comprising of a stator and a rotor characterised in that the motor is and electrical motor whose input current can be varied in frequency and voltage so that the motor has a scalable electrical power with a range between a minimum of 2,2 kW and a maximum of 20 kW of power in order to deal with different loads with the same motor model and not requiring geared motor groups when said motor is used for lifts, escalators, moving walkways, and between 20kW and a maximum of 2000kW in order to allow different loads with the same model of motor in which the constructive features of the diameter of the stator and the thickness of the bundles of magnetic plates of the stator and of the rotor are improved, with respect to the model of motor used for the traction of lifts, escalators and moving walkways, when said motor is applied to aerogenerators, both for the start-up of the aerogenerator and of the energy generator, eliminating the usual multiplier.
2. An asynchronous motor for traction systems for lifts, escalators, moving walkways and aerogenerators, powered by a frequency and power splitter, comprising a stator (1) and a rotor (2) each formed by a bundle of magnetic plates, the thickness of each of said bundles being equal, the bundle of magnetic plates of the stator (1), the shape of which is square with arched, cut off corners, having a central cylindrical gap, the periphery of which defines an interior surface where there are a plurality of axially arranged slots (14) for imbedding a coiling, and the bundle of magnetic plates of the rotor (2) being cylindrically-shaped with a central gap that is also cylindrical for said motor to pass through, and the exterior surface of said rotor being axially slotted for imbedding copper rods (21) that, welded at their ends to two rings (22), also of copper, form a squirrel cage, characterised in that said square-shaped magnetic plates with cut off, arched corners that comprise the stator (1) have a width and a height of 385 mm ~ 20%;
the quantity of said plurality of axial slots (14) of the stator is a number of between 60 and 84, and preferably 72, said number necessarily being a multiple of 12;
the thickness of said bundles of magnetic plates of the stator (1) and of the rotor (2) is of between 80 and 300 mm in the preferred in the preferred embodiment, depending on the power of the motor;
the air gap (15) or distance between said exterior surface of said rotor (2) and said interior surface of said cylindrical gap of said stator is of 0.4 mm ~
0.1 mm;
the diameter of said exterior surface of said rotor (2) is of 280 mm;
said plurality of axial slots of said rotor (1) is made up of a quantity of between 54 and 76 and is preferably of 66;
said number of axial slots of the rotor (2) is approximately 90% of said number of axial slots (14) of the stator (1);
said axial slots of the rotor (2) form an angle of 8° with the parents of an ideal cylinder formed by said squirrel cage;
said copper rods (21) and rings (22) that said squirrel cage forms have a crossways section of 5 × 16 mm.
Wherein, providing the asynchronous motor with the required voltage and frequency, with the corresponding phase shift between adjoining poles in accordance with the number of said poles, it is obtained the selection of both the nominal rotation speed within a wide margin and the motor output power from 2,2 kW to 20 kW, for its use in lifts, escalators, moving walkways in order to handle different loads with the same motor model without the need for geared motor groups.
the quantity of said plurality of axial slots (14) of the stator is a number of between 60 and 84, and preferably 72, said number necessarily being a multiple of 12;
the thickness of said bundles of magnetic plates of the stator (1) and of the rotor (2) is of between 80 and 300 mm in the preferred in the preferred embodiment, depending on the power of the motor;
the air gap (15) or distance between said exterior surface of said rotor (2) and said interior surface of said cylindrical gap of said stator is of 0.4 mm ~
0.1 mm;
the diameter of said exterior surface of said rotor (2) is of 280 mm;
said plurality of axial slots of said rotor (1) is made up of a quantity of between 54 and 76 and is preferably of 66;
said number of axial slots of the rotor (2) is approximately 90% of said number of axial slots (14) of the stator (1);
said axial slots of the rotor (2) form an angle of 8° with the parents of an ideal cylinder formed by said squirrel cage;
said copper rods (21) and rings (22) that said squirrel cage forms have a crossways section of 5 × 16 mm.
Wherein, providing the asynchronous motor with the required voltage and frequency, with the corresponding phase shift between adjoining poles in accordance with the number of said poles, it is obtained the selection of both the nominal rotation speed within a wide margin and the motor output power from 2,2 kW to 20 kW, for its use in lifts, escalators, moving walkways in order to handle different loads with the same motor model without the need for geared motor groups.
3. An asynchronous motor in accordance with claim 2, characterised in that the stator (1) is coiled with 12 poles;
in the stator (1) and in the rotor (2) the current density does not surpass 6 A/mm2;
the asynchronous motor has a slippage of approximately 8% with respect to the synchronous speed.
in the stator (1) and in the rotor (2) the current density does not surpass 6 A/mm2;
the asynchronous motor has a slippage of approximately 8% with respect to the synchronous speed.
4. The asynchronous motor in accordance with claim 2 characterised in that its intensity from start-up up to the operating speed is a growing function of the angular speed of the motor, its initial value being zero and always remaining at less than or equal the nominal intensity at said operating speed.
5. The asynchronous motor in accordance with claim 2 characterised in that by way of the increase of the diameter of the stator (1) up to 2000 mm and the thickness A of the bundle of magnetic plate of the stator (1) and the rotor (2) up to 1000 mm and acting on the constructive characteristics of the motor and feeding the resulting asynchronous motor with the necessary voltage and frequency, with the corresponding phase shift between adjoining poles in accordance with the number of said poles, the selection of both the nominal rotation speed within a wide margin and the motor output power from 20 kW to 2000 kW, for its use in aerogenerators without the need for the standard multiplier component.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/ES2004/000273 WO2006005774A1 (en) | 2004-06-14 | 2004-06-14 | Traction system for lifts, escalators, moving walkways and aerogenerators, which is equipped with an asynchronous motor, and asynchronous motor for said traction system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2612141A1 true CA2612141A1 (en) | 2006-01-19 |
Family
ID=35783537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002612141A Abandoned CA2612141A1 (en) | 2004-06-14 | 2004-06-14 | Traction system for lifts, escalators, moving walkways and aerogenerators, which is equipped with an asynchronous motor, and an asynchronous motor for said traction system |
Country Status (5)
| Country | Link |
|---|---|
| AR (1) | AR049352A1 (en) |
| BR (1) | BRPI0418917A (en) |
| CA (1) | CA2612141A1 (en) |
| TW (1) | TW200602253A (en) |
| WO (1) | WO2006005774A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2535773C2 (en) * | 2009-03-02 | 2014-12-20 | Дженерал Электрик Компани | Drive system and hoisting |
| TWI666460B (en) * | 2018-08-10 | 2019-07-21 | 東元電機股份有限公司 | Rapid test method for motor layer short |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4138596A1 (en) * | 1991-11-23 | 1993-05-27 | Buehne Werner Abus Kg | LIFTING WORKING WITH VARIABLE LIFTING SPEED |
| FR2692693A1 (en) * | 1992-06-23 | 1993-12-24 | Smh Management Services Ag | Control device of an asynchronous motor |
| US5852338A (en) * | 1997-02-03 | 1998-12-22 | General Electric Company | Dynamoelectric machine and method for manufacturing same |
| US6002191A (en) * | 1998-06-19 | 1999-12-14 | General Electric Company | Paired interlocks for stacking of non-rotated lamination cores |
| JP3624130B2 (en) * | 2000-01-21 | 2005-03-02 | 東海旅客鉄道株式会社 | Induction motor rotor and induction motor |
| JP4595250B2 (en) * | 2001-06-08 | 2010-12-08 | 三菱電機株式会社 | Single phase induction motor |
-
2004
- 2004-06-14 BR BRPI0418917-5A patent/BRPI0418917A/en not_active Application Discontinuation
- 2004-06-14 WO PCT/ES2004/000273 patent/WO2006005774A1/en active Application Filing
- 2004-06-14 CA CA002612141A patent/CA2612141A1/en not_active Abandoned
-
2005
- 2005-06-14 TW TW094119608A patent/TW200602253A/en unknown
- 2005-06-14 AR ARP050102418A patent/AR049352A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TW200602253A (en) | 2006-01-16 |
| BRPI0418917A (en) | 2007-11-27 |
| AR049352A1 (en) | 2006-07-19 |
| WO2006005774A1 (en) | 2006-01-19 |
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