JPH09227038A - Linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises and efficiently cool a linear motor provided for the balance weight of an well bucket type elevator. SOLUTION: This linear motor is provided with cooling fans 1a, 1b, 1c, 5 provided on a moving piece 2 and cooling the moving piece 2 and a stator 4 respectively, temperature sensors 3, 6 detecting the temperatures of the moving piece 2 and the stator 4, and a control means driving and controlling the cooling fans la, 1b, 1c via the detection signals from the temperature sensors 3, 6. The stator is cooled to resolve its overheat, the cooling fans 1a, 1b, 1c are operated and controlled according to the temperature of the motor, i.e., the load of the motor, the electric power is efficiently used, and the noises given to passengers can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a linear motor installed on a counterweight of a slip elevator.

[0002]

2. Description of the Related Art Generally, a linear motor installed on a counterweight of a slip elevator is equipped with a cooling device to prevent overheating during operation. The mover (primary conductor) that composes the linear motor is provided with a cooling fan for forced air cooling, but the stator (secondary conductor) side is structurally naturally air cooled.

Therefore, the cooling fan of the moving element is generally constructed so as to always be in operation even when the motor is stopped, and does not overheat even when the motor is in a non-operational state in order to stop the elevator. The elevator was operated for a certain period after the operation was stopped, and then stopped after a cooling period.

As described above, since the conventional linear motor is always in operation while the elevator is in operation, the cooling fan for the moving element continues to operate even when the load of the elevator is small and cooling is not actually required. Was configured.

[0005]

As described above, in the conventional linear motor, the moving fan cooling fan operates even when cooling is not always required. Therefore, the hoistway having the same operating noise of the cooling fan is used. There was a noise in the elevator car inside, which was heard as noise.

Further, when the cooling fan is stopped after a lapse of a certain time after the motor is stopped, the certain time is set regardless of whether the load of the elevator is light or heavy. Therefore, the motor is overheated due to the heavy load. However, since it stopped after a certain period of time, the mover sometimes fell into an overheated state.

Further, since the stator side is also naturally air-cooled, it may not be sufficiently cooled and may be damaged.

Further, since the constant operation of the cooling fan leads to useless power consumption, improvement has been demanded.

[0009]

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve the above-mentioned conventional problems, and the first invention is a linear motor installed on a counterweight of a slip-type elevator, which is a moving element. A cooling fan for cooling the mover and the stator, a temperature sensor for detecting the temperature of the mover and the stator, and a control means for driving and controlling the cooling fan based on a detection signal from the temperature sensor. It is characterized by doing.

As described above, since the cooling fan is operated according to the detected temperature, overheating of the moving element and the stator can be avoided, unnecessary operation can be suppressed, and noise to passengers in the car can be reduced.

According to a second aspect of the present invention, in a linear motor installed on a counterweight of a slip-type elevator, temperature sensors for detecting the temperatures of a moving element and a stator, respectively,
Calculation means for calculating the motor heat generation amount from the elevator operating time information and the elevator car load information and calculating the temperature corresponding to the heat generation amount, the temperature calculated by this calculation means and the temperature detected by the temperature sensor And a comparison means for obtaining the difference between the two.

Therefore, according to the present invention, by providing the calculating means and the comparing means, the difference between the temperature predicted by the calculation by the calculating means and the temperature detected by the temperature sensor can be known from the output of the comparing means. Since it is possible to determine whether or not there is a failure or abnormal operation of the temperature sensor, maintenance and inspection becomes easy.

According to a third aspect of the present invention, in a linear motor installed on a counterweight of a slip-type elevator, a plurality of temperature sensors provided on the moving element for detecting the temperatures of the stator and the moving element respectively, and a plurality of these temperature sensors are provided. It is characterized by further comprising: comparing means for comparing the temperature information respectively detected by the temperature sensors.

Therefore, according to the present invention, since a plurality of temperature sensors are provided, the system is duplicated, and means for comparing the temperature information from each sensor is provided, any one of them can be detected by detecting the comparison difference. Since the abnormality of the temperature sensor system can be detected, the linear motor can be accurately maintained and inspected, and the reliability can be improved.

According to a fourth aspect of the present invention, in a linear motor installed on a counterweight of a slip-type elevator, the heat value of the motor is calculated from the operating time information of the elevator and the load information of the elevator basket, and the temperature corresponding to the heat value is calculated. And a cooling fan which is provided on the mover so as to cool the mover and the stator and which is controlled in accordance with the temperature calculated by this calculate means. It is characterized in that the motor drive is controlled according to the temperature.

Therefore, according to the present invention, when the abnormal temperature rise of the linear motor is detected, the start-up control is automatically performed, so that the accident due to the overheating of the linear motor can be avoided in advance, and it is calculated by the calculating means. Since the cooling fan is controlled according to the temperature, unnecessary power consumption by the cooling fan can be suppressed, and noise in the basket due to the operation of the cooling fan can be reduced.

According to a fifth aspect of the present invention, in a linear motor installed on a counterweight of a slip-type elevator, a cooling fan provided on the moving element so as to cool the moving element and the stator and driving of the cooling fan are described above. And a control means for controlling according to a car position signal supplied from a control device provided in the elevator.

Therefore, the cooling fan is turned on according to the position of the car.
Since the N, OFF control and the like are performed, for example, the rotation speed of the cooling fan can be reduced when approaching the car, and the influence of the cooling fan operating noise on passengers in the car can be reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a linear motor according to the present invention will be described in detail below with reference to FIGS.

That is, FIG. 1 is a side view showing a cylindrical type linear motor, and a plurality of moving member cooling fans 1 (1a, 1a) are provided.
b, 1c) cools the mover (primary conductor) 2 of the motor,
Moreover, the temperature sensor 3 for moving elements is attached so as to measure the surface temperature of the moving element 2.

A stator cooling fan 5 for cooling the stator 4 of the linear motor is attached to the mover 2, and the temperature sensor 6 for the stator detects the temperature of the stator 4. It is attached to the upper surface of the moving element 2 near the stator 4. Further, a temperature sensor 8 is attached to the side surface of the counterweight 7 so that the temperature in the hoistway where the linear motor ascends and descends is detected.

When the load of the linear motor composed of the mover 2 and the stator 4 is constant, the amount of heat generated by the motor is maintained at a substantially constant value. Therefore, if there is no change in the heat dissipation condition of the linear motor itself and the motors of the cooling fans 1 and 5 are continuously operating at a constant rotation speed, the temperature of each part of the linear motor in operation is almost constant. Saturate.

FIG. 2A shows the temperature characteristics of each portion measured by each temperature sensor with respect to the linear motor operating time. Usually, the moving element 2 (temperature sensor 3),
The lower temperature is indicated in the order of the stator 4 (temperature sensor 6), the counterweight, or the temperature in the hoistway (temperature sensor 8). Therefore, the measured value of the temperature sensor 6 for the stator tends to trace between the measured value of the temperature sensor 3 for the moving element and the measured value of the temperature sensor 8 of the counterweight 7 under normal conditions.

However, if the temperature sensors 3, 6, 8 themselves fail, or if a defect occurs on the transmission line through which the detection signals from the temperature sensors 3, 6, 8 are transmitted, such temperature sensors 3, 6, 8 are generated. The temperature characteristic relationship between 6 and 8 may be broken.

For example, the temperature sensor 6 for the stator 5 fails, and as a result, as shown in FIG.
In some cases, the measured value of 1 may deviate from the measured value of the temperature sensor 3 and the measured value of the temperature sensor 8. By detecting this phenomenon, it is possible to detect that some abnormality has occurred in the system of the temperature sensor 6.

When the load on the motor becomes large, the amount of heat generated by the motor naturally increases, and the temperature of the motor itself rises. Since the load amount of the motor is almost proportional to the load amount of the elevator car and the operating time, the load of the motor can be calculated from the load amount of the car and the operating time number. FIG.
FIG. 4 is a diagram showing temperature characteristics of a moving element with respect to the load of the linear motor. As shown in the figure, the temperature prediction value 11 with respect to the load of the motor can be drawn by calculation within the allowable range of the calculation error (error upper limit 11a and error lower limit 11b).

Therefore, for example, when the measured value 12 of the motor temperature by the temperature sensor 3 for the moving element is compared with the predicted motor temperature value 11 predicted from the load of the linear motor, as shown in the figure, when the correlation is greatly broken. It is possible to determine that an abnormality has occurred in the temperature sensor system.

Thus, on the one hand, the temperature sensors 3 and 6
Detects the temperature of the mover 2 and the stator 4, respectively,
On the other hand, the motor heat generation amount is calculated from the elevator operating time information and the elevator car load information transmitted from the elevator control device, and the temperature corresponding to the heat generation amount is calculated. Therefore, by determining the difference between the temperature calculated corresponding to the elevator load and the temperature detected by the temperature sensor by the comparison means, it is possible to determine whether or not an abnormality has occurred in the temperature sensor system.

FIG. 4 is a block diagram of the control circuit of the linear motor.
A car load signal a is supplied from a car load detector 13 provided in an elevator car (not shown) to the elevator control device 14 via a transmission signal cable, and the control device 1
4 obtains the load amount b of the car from the in-car load signal a, and supplies the car load signal b and the elevator operating time signal c to the arithmetic circuit 15 of the linear motor. The arithmetic circuit 15 calculates the heat generation amount of the linear motor corresponding to the load of the elevator from the load amount b of the car from the control device 14 and the operating time information c of the elevator, and calculates the temperature d corresponding to the heat generation amount. The conversion is calculated and supplied to the comparison detection circuit 16. The comparison detection circuit 16 is the arithmetic circuit 1
The temperature d corresponding to the motor load from 5, and the temperatures e and f detected by the temperature sensors 3 and 6 of the moving element 2 and the stator 4, respectively.
Is supplied to the determination circuit 17, and the signal g of the difference is supplied to the determination circuit 17. The judgment circuit 17 compares the comparison detection difference signal g with the reference signal h within the allowable error range set in advance by the reference level setting circuit 18, and when the predetermined reference signal level is exceeded, the comparison judgment output i is output. It is determined that an abnormality has occurred in the temperature sensor system.

That is, the actually measured value 12 (e, f) of the motor (mover, stator) by the temperature sensors 3 and 6 is the predicted motor temperature value 11 (d) and its allowable error range (11a-1).
1b), the judgment circuit 17 judges that the motor is in a normal state, but if the motor measured value 12 (e,
When f) deviates from the reference signal h (11a to 11b) within the allowable error range, it can be determined that the sensor system is abnormal because it does not match the actual temperature of the linear motor, and the reliability of the linear motor is secured. can do.

Further, in the configuration diagram of FIG. 4, each of the temperature sensors 3 and 6 provided on the moving element 2 is composed of a plurality of temperature sensors, and the temperatures of the stator 2 and the moving element 4 are detected separately. By comparing the temperature information respectively detected by the plurality of temperature sensors with the comparison detection circuit 16,
The sensor system can be duplicated and the comparison result of the two can be monitored.

In this way, by providing a plurality of temperature sensors, duplicating the system, and comparing and monitoring the two, when the abnormality of any of the temperature sensor systems occurs, the determination circuit 1
Since the determination can be made immediately according to 7, it is possible to increase the reliability during operation of the linear motor.

Next, FIG. 5 is a diagram showing the relationship between the temperature of the linear motor and the operation modes of the cooling fans 1, 5 and the elevator. An air-cooled cooling fan 1 is used for the motor mover 2.
It is assumed that three units (1a, 1b, 1c) are installed.
If the temperature of the motor is sufficiently low, cooling by the cooling fan 1 is not necessary, but depending on the temperature rise of the moving element 2, that is, when the threshold value 1 of the motor temperature is exceeded, one unit and the threshold value 2 are set. The number of operating cooling fans 1 is controlled in accordance with the temperature, such as two when the number exceeds 3 and three when the threshold value exceeds 3.

Further, when the motor temperature further rises and exceeds the threshold value 4, all three cooling fans 1 are in the operating state, the number of times of starting the elevator is suppressed, and the heat generation amount of the motor is suppressed. Control. When the temperature further rises and reaches the threshold value 5, it is determined that the heat generation of the motor has reached the allowable limit, the elevator is stopped, and the overheat of the motor is avoided. In this way, the operation mode of the linear motor is selectively changed according to the temperature detected by the temperature sensors 3 and 6, so that overheat can be avoided and efficient use of electric power can be achieved.

In the above description, the case where the temperature sensor 3 of the moving element 2 of the motor is used has been described as an example, but the same can be applied to the cooling fan 5 for the stator, and both of them can be used together. May be.

In the above, it was explained that the operation mode of the linear motor is controlled by the temperature detected by each of the temperature sensors 3, 6, 8 of the moving element 2, the stator or the counterweight 7, but the measurement from these temperature sensors is performed. The operation mode can be selectively controlled without using the value.

That is, FIG. 6 shows the temperature sensors 3, 6, 8
5 shows a state in which the operation mode is determined based on the motor load and the motor temperature predicted value, which are partially described in FIGS. 3 and 4, without using the measured value of FIG. As shown in the figure, the temperature of the motor itself rises as the motor load increases, so the number of operating cooling fans 1 is selected in response to the temperature rise. According to this configuration, even if an abnormality occurs in the temperature sensor system, the motor is cooled in response to the temperature increase caused by the load change of the motor, so that the efficient operation of the cooling fan 1 and the power consumption can be prevented. It becomes possible to consume.

Further, since the cooling fans 1 and 4 of the linear motor are operated in a narrow hoistway, noise caused by the rotation of the fans should be prevented as much as possible from being heard by passengers in the car using the elevator. Is desired.
Also in this embodiment described above, since the cooling fans 1 and 4 are actually operated according to the necessity of cooling, noise is significantly reduced as compared with the conventional case.

However, in a slip elevator, the relative positional relationship between the linear motor and the riding basket changes depending on the ascending / descending position. That is, there are cases where they are close to each other and cases where they are far apart.

In the following explanation, the operation of the cooling fan is changed according to the mutual distance between the riding basket and the linear motor,
It further reduces the noise to passengers.

That is, FIG. 7 is a diagram for explaining a method of suppressing the noise in the car by changing the number of operating fans depending on the car position when the operating noise of each cooling fan 1 and 5 causes noise in the car. Is. That is, as shown in FIG.
The number of operating cooling fans 1 and 5 provided on the mover is controlled so as to be changed by introducing a car position signal from the elevator control device 14.
Although not shown, the car position signal is generated by a pulse signal from a car position pulse generator that is linked to the hoist.

FIG. 7 shows a case where a maximum of three cooling fans 1 and 5 are operating. At the top and bottom stop floors,
The distance between the riding basket and the linear motor is the largest. Therefore, the passengers in the car are less affected by noise from the cooling fans 1 and 5, and all the cooling fans 1 and 5 can be operated. However, in the vicinity of the intermediate stop floor where the riding basket and the linear motor are close to each other, the distance between the riding basket and the linear motor is close, so the control circuit reduces or stops the number of operating cooling fans 1 and 5 for cooling. It is possible to suppress or stop the propagation of the driving sounds of the fans 1 and 5 to the passengers in the basket.

As described above, according to the present invention, the cooling fan is efficiently operated by the temperature detected by the temperature sensor installed on the mover or the stator, and it is possible to avoid useless power consumption and It is also possible to reduce noise to passengers in the riding basket. In addition, by incorporating the actual operating load information of the linear motor, it is possible to detect a defect in the temperature sensor system and provide a highly reliable linear motor.

[0044]

As described above, according to the present invention, the cooling fan is efficiently operated by the temperature detected by the temperature sensor installed on the moving element or the stator, and it is possible to avoid wasteful power consumption. At the same time, it is possible to reduce the noise to passengers in the riding basket, which is a great practical effect.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a linear motor according to the present invention.

FIG. 2 is a temperature characteristic diagram detected by a temperature sensor with respect to the operation of the motor in the linear motor shown in FIG.

FIG. 3 is a correlation diagram between a motor load and a predicted motor temperature value in the linear motor shown in FIG.

FIG. 4 is a circuit configuration diagram for comparing and determining an actual temperature detected by a temperature sensor based on the correlation between the motor load and the motor temperature prediction shown in FIG.

5 is a relationship diagram between a temperature detected by a temperature sensor and an operation mode in the linear motor shown in FIG.

FIG. 6 is a diagram illustrating the relationship between the motor load and the number of operating cooling fans in the linear motor shown in FIG. 1.

7 is a diagram illustrating the relationship between the elevator car position and the number of operating cooling fans in the linear motor shown in FIG.

[Explanation of symbols]

 1, 5 Cooling fan 2 Mover 3, 6, 8 Temperature sensor 4 Stator 7 Balance weight 15 Arithmetic circuit 17 Judgment circuit

Claims (6)

[Claims] 1. A linear motor installed on a counterweight of a slip-type elevator, a cooling fan provided on a moving element for cooling the moving element and the stator, and a temperature sensor for detecting temperatures of the moving element and the stator. And a control means for driving and controlling the cooling fan according to a detection signal from the temperature sensor. 2. The linear motor according to claim 1, wherein the motor drive time of the linear motor is controlled so as to be suppressed when the temperatures detected by the temperature sensor for the stator and the mover respectively exceed predetermined temperatures. 3. In a linear motor installed on a counterweight of a slip-type elevator, the motor heat is generated from temperature sensors that detect the temperature of a moving element and a stator, respectively, and the operating time information of the elevator and the load information of the elevator basket. A linear device comprising: a calculating unit for calculating the amount of heat and a temperature corresponding to the amount of generated heat; and a comparing unit for calculating a difference between the temperature calculated by the calculating unit and the temperature detected by the temperature sensor. motor. 4. A linear motor installed on a counterweight of a slip-type elevator, wherein a plurality of temperature sensors are provided on the mover for detecting the temperatures of the stator and the mover, respectively, and the plurality of temperature sensors are used to detect the temperature. A linear motor comprising: a comparison unit that compares the temperature information detected correspondingly. 5. In a linear motor installed on a counterweight of a slip-type elevator, a calorific value of the motor is calculated from the operating time information of the elevator and load information of the elevator car, and a temperature corresponding to the calorific value is calculated. And a cooling fan that is provided on the mover so as to cool the mover and the stator and is controlled in accordance with the temperature calculated by the calculating means, and has a temperature calculated by the calculating means. A linear motor characterized in that the motor drive is controlled accordingly. 6. A linear motor installed on a counterweight of a slip-type elevator, wherein a cooling fan provided on the mover so as to cool the mover and the stator and a drive of this cooling fan are provided on the elevator. And a control means for controlling according to a car position signal supplied from the control device.