CN117007915A - Traction machine for elevator - Google Patents

Abstract

The present invention provides a traction machine for elevators that can evaluate the state of insulation degradation without directly applying voltage to a stator coil. The elevator traction machine of the present invention is an elevator traction machine including a stator and a rotor that can rotate relative to the stator. The stator includes: a stator core having an annular portion surrounding the outer periphery of the rotor; and a plurality of stator coils. , which are arranged in a circumferential direction of the stator core; a detection part adjacent to at least one stator coil among the plurality of stator coils and arranged in a state insulated from at least one stator coil; and an insulator between the plurality of stator coils between each stator coil and the stator core, and between the stator core and the detection part. When electric power is applied to the detection unit, the detection unit detects a response signal corresponding to the electric power generated by the detection unit and the portion of the stator core where at least one stator coil is arranged.

Description

Traction machine for elevator

Technical field

The invention relates to a traction machine for elevators.

Background technique

For example, Patent Document 1 describes an elevator device having a function of determining insulation degradation of a drive motor of an elevator. More specifically, the elevator apparatus of Patent Document 1 has a detection resistor connected to the power conversion circuit of the rotating electric machine, and detects insulation degradation by measuring the voltage value generated at both ends of the detection resistor.

As other methods for evaluating insulation degradation of a rotating electrical machine, known are, for example, a method of installing an indirect sensor to confirm partial discharge, or a method of directly applying a voltage to a stator coil to change its electrostatic capacitance to evaluate insulation degradation.

existing technical documents

patent documents

Patent Document 1: Japanese Patent Application Publication No. 2007-055743

Contents of the invention

The problem to be solved by the invention

For example, in a method of indirectly evaluating insulation deterioration using a detection resistor, a sensor, or the like, it is difficult to determine the degree of deterioration and the location of deterioration with high accuracy. Furthermore, in the case of the evaluation method in which a voltage is directly applied to the stator coil, the stator coil itself may be deteriorated due to the voltage application for inspection. In particular, after the elevator traction machine is installed in a building, it may be used without repairing the motor part for a long period of time. Inspection by directly applying a voltage to the stator coil of a traction machine that has been used for such a long period of time may aggravate the deterioration of the stator coil, which is not preferable.

In order to solve the above problems, the present invention provides a traction machine for elevators, which has an improved degradation evaluation function that can evaluate the state of insulation degradation without directly applying voltage to the stator coil.

Means used to solve problems

The elevator traction machine of the present invention is an elevator traction machine including a stator and a rotor that can rotate relative to the stator. The stator includes: a stator core having an annular portion surrounding the outer periphery of the rotor; and a plurality of stator coils. , which are arranged in a circumferential direction of the stator core; a detection part adjacent to at least one stator coil among the plurality of stator coils and arranged in a state insulated from at least one stator coil; and an insulator between the plurality of stator coils. between each stator coil and the stator core, and between the stator core and the detection part. When electric power is applied to the detection unit, the detection unit detects a response signal corresponding to the electric power generated by the detection unit and the portion of the stator core where at least one stator coil is arranged.

Invention effect

According to the present invention, by applying a voltage to a detection unit provided independently from the stator coil and detecting a response signal, the state of insulation degradation can be detected with high accuracy. In addition, the object of voltage application during degradation evaluation is a detection unit provided separately from the stator coil. Therefore, even when insulation degradation is evaluated, insulation degradation can be evaluated without degrading the driving part of the hoisting machine.

Description of the drawings

FIG. 1 is a diagram schematically showing a part of the stator of the hoisting machine according to Embodiment 1 of the present invention.

FIG. 2 is a diagram schematically showing the circuit structure of the stator of the hoisting machine according to this embodiment.

Label description

10: stator;

11: Stator core;

12: Stator coil;

13: Each testing department;

14: Insulator;

15: Insulation department;

16: Magnetic pole teeth.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each drawing, the same or corresponding parts are given the same reference numerals and their descriptions are simplified or even omitted.

FIG. 1 is a diagram schematically showing a part of the stator of the hoisting machine according to Embodiment 1 of the present invention. The traction machine of this embodiment is an elevator traction machine. The traction machine includes at least a stator 10 and a rotor (not shown) arranged inside the stator 10 and capable of rotating relative to the stator 10 . The stator 10 is coaxially arranged with the rotor.

As shown in FIG. 1 , the stator 10 includes a stator core 11 , a stator coil 12 , a detection part 13 , an insulator 14 and an insulating part 15 . The stator core 11 is a member having an annular shape and is arranged to surround the outer periphery of the rotor. Hereinafter, in the present embodiment, the radial direction and the circumferential direction of the annular portion of the stator core 11 will be described as “radial direction” and “circumferential direction” respectively.

The stator core 11 has a plurality of magnetic pole tooth portions 16 arranged at equal intervals at intervals in the circumferential direction. The plurality of stator coils 12 are respectively provided on the plurality of magnetic pole tooth portions 16 . The plurality of stator coils 12 are arranged at equal intervals in the circumferential direction of the stator core 11 . By energizing the stator coil 12 , a rotating magnetic field is generated in the stator 10 , whereby the rotor can be rotated.

The detection unit 13 is arranged adjacent to the radially outer side of each stator coil 12 . The detection unit 13 includes the same coil as the stator coil 12 . The coil of the detection unit 13 is wound around a portion of the magnetic pole tooth portion 16 around which the stator coil 12 is wound, radially outward of the stator coil 12 , and is made of the same material as the stator coil 12 .

An insulating part 15 is sandwiched between each stator coil 12 and each detection part 13 to provide insulation. In addition, the insulator 14 is interposed between each magnetic pole tooth portion 16 , each stator coil 12 and each detection portion 13 . Accordingly, in the stator 10 , the stator core 11 is insulated from the stator coil 12 and the detection part 13 , and the stator coil 12 and the detection part 13 are insulated. The stator coil 12 and the detection part 13 are arranged in independent positions insulated from each other.

FIG. 2 is a diagram schematically showing the circuit structure of the stator of the hoisting machine according to this embodiment. In FIG. 2 , the circuit of the stator coil 12 and the detection unit 13 is represented by an equivalent circuit. As shown in FIG. 2 , power can be applied independently from the power source to the stator coil 12 and the coils of the detection unit 13 .

When a voltage is applied to the coil, each detection unit 13 detects a response current value flowing through the coil of each detection unit 13 and the magnetic pole tooth portion 16 around which the coil is wound and in the vicinity of the voltage application, and uses this as a response signal. output. Here, the response current value is, for example, partial discharge current or leakage current. The partial discharge current or the leakage current has a correlation with the insulation state of each magnetic pole tooth portion 16 where each detection unit 13 is arranged and its vicinity. Therefore, the insulation state of the stator core 11 near each detection unit 13 can be evaluated based on the partial discharge current or leakage current.

In this embodiment, the elevator traction machine may be configured to have a function as an evaluation unit that evaluates the insulation state of the stator core 11 based on the output of the detection unit 13 . Alternatively, the function of the evaluation unit may be the function of the detection unit 13, or may be the structure of the control device that controls the operation of the elevator. Alternatively, the evaluation unit may be provided in an inspection device for inspecting a traction machine, a management device for group management of elevators, a monitoring device for remote monitoring of elevators, or the like.

When evaluating the insulation state of the stator core 11, a voltage signal is applied as a test signal to the coil of the detection unit 13 to be evaluated. The detection unit 13 outputs a response current value to the voltage signal as a response signal. The evaluation unit obtains a response signal from the detection unit 13 and evaluates the insulation state in the vicinity of the magnetic pole tooth portion 16 where the detection unit 13 to be evaluated is provided based on the response signal.

As described above, according to the present embodiment, the hoisting machine is provided with the detection unit 13 having a coil separate from the stator coil 12 . Accordingly, it is possible to perform an insulation state evaluation test without directly applying voltage to the stator coil 12 . Therefore, even if the stator coil 12 is expected to deteriorate due to long-term use, the test can be performed without worrying about worsening of deterioration or damage. In addition, even if the coil is damaged due to voltage application in the evaluation of the insulation state, the damaged part is the coil of the detection unit 13 that is independent of the stator coil 12 and will not affect the driving unit of the traction machine. In addition, each detection unit 13 is composed of a coil of the same material wound around the same magnetic pole tooth portion 16 as each stator coil 12 . Therefore, the location and state of insulation degradation can be grasped with high accuracy.

In addition, in this embodiment, the elevator traction machine may be configured to have a function as a setting unit that sets limits on the starting of the traction machine based on the response current value which is the output of the detection unit 13 . Alternatively, the function as the setting unit may be a configuration of an elevator control device that controls the operation of the elevator, a management device that performs group management of elevators, or a monitoring device that performs remote monitoring.

The setting unit calculates the change rate of the response current value output by each detection unit 13, and sets, for example, a threshold for starting the hoisting machine based on the change rate. The control device that controls the hoisting machine uses a threshold value set by the setting unit as a limit value of electric power applied to the hoisting machine at the time of starting, and starts the hoisting machine within a range that does not exceed the threshold value. Thereby, the traction machine can be operated within the range which does not cause dielectric breakdown.

In addition, in this embodiment, the structure in which the detection part 13 is provided in all the several magnetic pole tooth parts 16 was demonstrated. However, in this embodiment, the number of detection units 13 is not limited to this. For example, the detection unit 13 may be arranged in at least one magnetic pole tooth unit 16 among the plurality of magnetic pole tooth units 16 . However, in order to grasp the state of insulation degradation of the stator core 11, it is preferable to arrange the detection units 13 at substantially equal intervals in a plurality of locations.

In addition, in this embodiment, the case where the voltage is applied to the coil of the detection part 13 only in order to evaluate the insulation state was demonstrated. However, the elevator traction machine is not limited to this. For example, the coil of the detection unit 13 may be configured to contribute to the motor torque together with the stator coil 12 by flowing a current.

The preferred embodiments and the like have been described in detail above. However, the embodiments are not limited to the above-described embodiments, and various modifications and changes can be made to the above-described embodiments without departing from the scope described in the claims. Displacement.

Hereinafter, various aspects of the present invention are summarized and described as appendices.

(Note 1) A traction machine for elevators, including a stator and a rotor capable of rotating relative to the stator, characterized in that:

The stator has:

A stator core having an annular-shaped portion surrounding the outer circumference of the rotor;

A plurality of stator coils arranged in a circumferential direction of the stator core;

a detection unit adjacent to at least one stator coil among the plurality of stator coils and arranged in a state insulated from the at least one stator coil; and

an insulator interposed between each of the plurality of stator coils and the stator core, and between the stator core and the detection part,

The detection unit detects a response signal corresponding to the electric power generated by the detection unit and the portion of the stator core where the at least one stator coil is arranged, in response to the application of electric power.

(Note 2)

The elevator traction machine according to Note 1 is characterized in that:

The stator core is provided with a plurality of magnetic pole teeth arranged at intervals in the circumferential direction,

The plurality of stator coils are coils respectively wound around the plurality of magnetic pole teeth,

The detection unit includes a coil wound around the same magnetic pole tooth portion of the magnetic pole tooth portion as the magnetic pole tooth portion around which the at least one stator coil is wound.

(Note 3)

The elevator traction machine according to appendix 1 or 2, wherein a plurality of the detection units are arranged adjacent to each of the plurality of stator coils.

(Note 4)

The elevator traction machine according to any one of appendices 1 to 3, characterized in that the elevator traction machine further includes an evaluation unit that evaluates the stator core based on the response signal. The insulation of the portion configured with the at least one stator coil is in a state of degradation.

(Note 5)

The elevator traction machine according to any one of appendices 1 to 4, characterized in that the response signal is a partial discharge current or a leakage current.

(Note 6)

The elevator traction machine according to appendix 5, characterized in that the elevator traction machine further includes a setting unit that calculates a rate of change of the current value of the response signal and determines the change rate based on the change. rate to set the limit value for the electric power applied when starting the elevator traction machine.

Claims (6)

1. A hoisting machine for an elevator, comprising a stator and a rotor rotatable relative to the stator, characterized in that,

the stator includes:

a stator core having a ring-shaped portion surrounding an outer periphery of the rotor;

a plurality of stator coils arranged in a circumferential direction of the stator core;

a detection unit that is adjacent to at least one of the plurality of stator coils and is arranged in an insulated state from the at least one stator coil; and

an insulator interposed between each of the plurality of stator coils and the stator core and between the stator core and the detection portion,

the detection unit detects a response signal corresponding to the electric power generated by the detection unit and the portion of the stator core where the at least one stator coil is arranged, with respect to the application of the electric power.

2. The hoisting machine for elevator according to claim 1, characterized in that,

the stator core includes a plurality of magnetic pole teeth arranged at intervals in the circumferential direction,

the plurality of stator coils are coils respectively wound on the plurality of magnetic pole teeth,

the detection unit includes a coil wound around the same one of the magnetic pole teeth as the magnetic pole tooth around which the at least one stator coil is wound.

3. The hoisting machine for elevator according to claim 1 or 2, characterized in that,

the detection unit is disposed adjacent to each of the plurality of stator coils.

4. The hoisting machine for elevator according to claim 1 or 2, characterized in that,

the elevator hoisting machine further includes an evaluation unit that evaluates a state of insulation degradation of a portion of the stator core where the at least one stator coil is disposed, based on the response signal.

5. The hoisting machine for elevator according to claim 1 or 2, characterized in that,

the response signal is a partial discharge current or a leakage current.

6. The hoisting machine for elevator according to claim 5, characterized in that,

the elevator hoisting machine further includes a setting unit that calculates a rate of change of the current value of the response signal and sets a limit value for electric power applied at the time of starting the elevator hoisting machine based on the rate of change.