CN109733971B - Elevator balance coefficient detection method - Google Patents
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Abstract
The invention discloses an elevator balance coefficient detection device and a method thereof, wherein the device comprises a distance meter, a speed measuring device, a measuring host and two pincerlike ampere meters, wherein a measuring point of the distance meter is positioned on the lower surface of an elevator car, the speed measuring device is arranged at a steel wire rope of a traction machine, the two pincerlike ampere meters are connected with two of three-phase wires of the traction machine, the speed measuring device, the pincerlike ampere meters and the three-phase wires of the traction machine are all communicated with the measuring host, and the measuring host is communicated with a handheld control end. The invention is characterized in that: the elevator balance coefficient data is accurately measured by utilizing the relation among the actual measurement motor power, the total energy consumption efficiency, the acceleration, the speed, the stroke, the transmission resistance, the rated load, the gravity acceleration and the wire rope winding method, the whole-course monitoring measurement distance of the camera is simple and easy to operate, intelligent detection is realized, the data result of the elevator balance coefficient is finally obtained, the influence of the manual measurement reading error is avoided, the measurement accuracy is improved, and the detection efficiency is further improved.
Description
Technical Field
The invention relates to the field of elevator detection, in particular to an elevator balance coefficient detection method.
Background
The elevator balance coefficient is an important index of a traction drive type elevator, and the existing method for detecting the elevator balance coefficient firstly calculates the weight of the elevator car and the counterweight by testing the tension of the elevator car and the counterweight wire rope in an idle mode when the elevator car and the counterweight are at the same position, and calculates the balance coefficient by utilizing the relation between the weight difference and the rated load of the elevator car and the counterweight wire rope.
The second method for detecting the balance coefficient of the elevator is according to TSG 7001-2009 in elevator supervision test and periodic test rule-traction and forced drive elevator: the lift car is respectively loaded with 30%,40%,45%,50% and 60% of rated load, and runs in the whole course of upward and downward, when the lift car and counterweight reach the same position, the current value of the current motor is recorded, the current load curve is manually drawn, the curve intersection point of upward and downward running is drawn, and the weight/rated load is obtained through the curve intersection point, namely the balance coefficient value. The method has the advantages of mature technology, strong professional quality and actual field experience of measurement personnel, more links for measuring intermediate carrying weights, more trouble, time and labor consumption, and time and labor consumption when the elevator is mistakenly used.
Disclosure of Invention
The invention aims to overcome the defects and provide an elevator balance coefficient detection method.
The technical scheme adopted by the invention for achieving the purpose is as follows: the utility model provides an elevator balance coefficient detection device, includes distancer, velometer, measurement host computer, two pincerlike ampere meters, the measuring point of distancer is located elevator car lower surface, velometer sets up in hauler wire rope department, two pincerlike ampere meter is connected with two of three-phase line of hauler, velocimeter, hauler three-phase line all communicate with measurement host computer, measurement host computer and handheld control end intercommunication.
The speed measuring device comprises a speed measuring wheel and a speed measuring sensor, the speed measuring sensor is connected with the speed measuring wheel, the speed measuring wheel is abutted against a steel wire rope of the traction machine when measuring speed, the measuring host comprises a data acquisition circuit, a data processing circuit and a lithium battery which are arranged in a host shell, and a display screen which is arranged on the host shell, the data acquisition circuit is communicated with the data processing circuit, the lithium battery and the display screen are communicated with the data processing circuit, and the speed measuring sensor, a three-phase wire of the traction machine and a clamp ammeter are communicated with the data acquisition circuit which is communicated with a handheld control end.
The traction machine comprises a main machine shell, and is characterized in that three voltage acquisition interfaces, two current acquisition interfaces and a speed acquisition interface which are communicated with a data acquisition circuit are arranged on the main machine shell, the three voltage acquisition interfaces are respectively connected with a traction machine three-phase line, the two current acquisition interfaces are respectively connected with two pincerlike ammeter, and the speed acquisition interfaces are connected with a speed sensor.
The speed measuring device further comprises a universal joint and a magnet, the speed measuring sensor is arranged on the speed measuring shell, one end of the universal joint is connected with the speed measuring shell, the other end of the universal joint is connected with the magnet, and the magnet is adsorbed on the traction machine iron support.
The data acquisition circuit is connected with a wireless data transmitting module, and is communicated with a wireless data receiving module of the handheld control end through the wireless data transmitting module.
The range finder comprises a range finder sensor, a camera, a range finding circuit board and a range finding battery, wherein the range finding sensor and the camera are installed on a range finder shell, the range finding circuit board and the range finding battery are installed in the range finder shell, the range finding sensor, the camera and the range finding battery are communicated with the range finding circuit board, and the range finding circuit board is connected with a range finding display screen installed on the range finder shell.
The range finder comprises a range finding sensor, a camera, a range finding circuit board and a range finding battery, wherein the range finding sensor and the camera are installed on a range finder shell, the range finding circuit board and the range finding battery are installed in the range finder shell, the range finding sensor, the camera and the range finding battery are communicated with the range finding circuit board, and the range finding circuit board is connected with a handheld control end.
The elevator balance coefficient detection method comprises the following steps:
a. the elevator car is stopped at the top floor, measuring the height L1 of the lower surface of the elevator car;
b. starting an elevator car, moving from a top layer to a bottom layer, measuring elevator car downlink currents A1 and A2, downlink voltages V1, V2 and V3, elevator real-time running acceleration A1 and downlink speed Vd, and measuring the height L2 of the lower surface of the elevator car;
c. calculating a downlink travel ld=l1-L2;
d. starting an elevator car, moving from a bottom layer to a top layer, measuring the elevator car uplink currents A3 and A4, uplink voltages V4, V5 and V6, the elevator real-time running acceleration a2 and the uplink speed Vu, and measuring the elevator car lower surface height L3;
e. calculating an uplink stroke lu=l3-l2;
f. calculating a balance coefficient K by adopting a parameter identification method:
firstly, respectively establishing a downlink motion model and an uplink motion model as shown in a formula (4) and a formula (5),
wherein Nd is the input power of the elevator descending motor, eta d is the efficiency of the elevator descending motor multiplied by the total mechanical efficiency, and Vd is the elevator descending speed; nu is the power generated by the input power of the elevator ascending motor, eta u is the power generation efficiency of the elevator ascending motor multiplied by the total mechanical efficiency, vu is the elevator ascending speed, g is the gravity acceleration, Q is the rated load of the elevator, K is the balance coefficient,,/>it can be assumed that ηd=ηu=η, equation (6) is obtained by equation (4) and equation (5),
kd and Ku can be obtained by a system identification method for the formula (4) and the formula (5), eta can be obtained by calculation of the formula (6), and the balance coefficient K can be calculated by Kd, ku and eta.
The elevator balance coefficient detection method comprises the following steps:
a. stopping the elevator car on the top layer, and measuring the height L1 of the lower surface of the elevator car;
b. starting an elevator car, moving from a top layer to a bottom layer, measuring elevator car downlink currents A1 and A2, downlink voltages V1, V2 and V3, elevator real-time running acceleration A1 and downlink speed Vd, and measuring the height L2 of the lower surface of the elevator car;
c. calculating a downlink travel ld=l1-L2;
d. starting an elevator car, moving from a bottom layer to a top layer, measuring the elevator car uplink currents A3 and A4, uplink voltages V4, V5 and V6, the elevator real-time running acceleration a2 and the uplink speed Vu, and measuring the elevator car lower surface height L3;
e. calculating an uplink stroke lu=l3-l2;
f. calculating a balance coefficient K by adopting an energy consumption balance method:
the total energy consumed by the elevator in the downstream direction is converted into the potential energy of the counterweight end, and the potential energy of the elevator in the upstream direction is converted into electric energy, so that the formula (8) and the formula (9) can be obtained,
wherein Pd is total power consumption of elevator downlink, pu is total power generation of elevator uplink, ld is elevator downlink, lu is elevator uplink, eta is efficiency, g is gravity acceleration, Q is rated load of elevator, K is balance coefficient, formula (10) can be obtained based on formula (8) and formula (9),
based on the formula (8), the formula (9) and the formula (10), since the elevator goes down and then the elevator goes up to the top floor, the mechanical potential energy increases to 0, and the difference between the consumed electric energy and the generated electric energy is the loss, the formula (11) can be obtained assuming that the losses of the elevator going up and the elevator going down are the same,
since Pu is the total power generation amount of the elevator, pd can be calculated based on the formula (11) and the formula (10), and the balance coefficient K can be calculated based on the formula (8) and the formula (9) since Pd, pu, ld, lu, g, Q are known.
The invention is characterized in that: the elevator balance coefficient data is accurately measured by utilizing the relation among the actual measurement motor power, the total energy consumption efficiency, the acceleration, the speed, the stroke, the transmission resistance, the rated load, the gravity acceleration and the wire rope winding method, the full-range monitoring measurement distance of the visible camera is provided, the operation is simple and easy, the intelligent detection is realized, the data result of the elevator balance coefficient with a machine room and a machine room is finally obtained, the influence of the manual measurement reading error is avoided, the measurement precision is improved, and the detection efficiency is further improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the rangefinder of the present invention.
FIG. 3 is a schematic diagram of a measurement host of the present invention.
Fig. 4 is a schematic view of the speed measuring device of the present invention.
Fig. 5 is a diagram of the present invention, which is representative of the current clamp.
Fig. 6 is a schematic diagram of a handheld control end of the present invention.
Fig. 7 is a schematic circuit diagram of the present invention.
Wherein: 1. the system comprises a range finder 101, a range finder sensor 102, a camera 103, a range finder housing 104, a range finding circuit board 105, a range finding battery 106, a range finding display screen 2, a measuring host 201, a host housing 202, a switch 203, a voltage acquisition interface 204, a current acquisition interface 205, a speed acquisition interface 206, a lithium battery charging port 207, a USB interface 208, a display screen 209, a data acquisition circuit 210, a data processing circuit 211, a wireless data transmission module 212, a lithium battery 3, a speed measuring device 301, a speed measuring wheel 302, a speed measuring sensor 303, an acquisition line interface S304, a speed measuring housing 305, a universal joint 306, a magnet 4, a clamp-on ammeter 401, a plastic housing 402, a current transformer 403, an acquisition line interface A404, a current data acquisition circuit 405, a spring 501, a red voltage acquisition line 502, a yellow voltage acquisition line 504, a red current acquisition line 505, a yellow current acquisition line 506, a speed acquisition line 6, a traction machine 7, a traction machine wire rope 8, an elevator car 9, a machine iron bracket 10, a traction machine three-phase line 11, a traction machine three-phase line 12, a handheld control end, and a wireless traction control end 1201.
Detailed Description
As shown in fig. 1-7, the invention relates to an elevator balance coefficient detection device, which comprises a distance meter 1, a speed measuring device 3, a measuring host 2, a handheld control end 12 and two clamp-on ammeter 4.
The range finder 1 is a visual range finder, and comprises a range finder sensor 101, a camera 102, a range finding circuit board 104 and a range finding battery 105, wherein the range finder sensor 101 and the camera 102 are installed on a range finder shell 103, the range finding circuit board 104 and the range finding battery 105 are installed in the range finder shell 103, the range finding sensor 101, the camera 102 and the range finding battery 105 are communicated with the range finding circuit board 104, the position of light emitted by the range finding sensor 101 is observed through the camera 102, a measuring point is guaranteed to be on the lower surface of an elevator car 8, the range finding circuit board 104 is connected with a range finding display screen 106 installed on the range finder shell 103 or is connected with a wireless signal of a handheld control end 12, measured data are transmitted to the range finding circuit board 104 by the range finding sensor 101, and the range finding circuit board 104 displays a distance value through the range finding display screen 106 or the handheld control end 12 after being processed.
The speed measuring device 3 comprises a speed measuring wheel 301, a speed measuring sensor 302, a universal joint 305 and a magnet 306, wherein the speed measuring sensor 302 is connected with the speed measuring wheel 301, the speed measuring wheel 301 is abutted against the traction machine steel wire rope 7 during speed measurement, the speed measuring sensor 302 is arranged on a speed measuring shell 304 and is connected with an acquisition line interface S303 on the speed measuring shell 304, one end of the universal joint 305 is connected with the speed measuring shell 304, the other end of the universal joint 305 is connected with the magnet 306, and the magnet 306 is adsorbed on the traction machine iron bracket 9.
The clamp-on ammeter 4 comprises a current transformer 402 which is arranged in a clamp shape, a plastic shell 401 is sleeved on the current transformer 402, a spring 405 which can be retracted in a telescopic mode is arranged on the current transformer 402, the current transformer 402 is connected with a current data acquisition circuit 404 in the plastic shell 401, and the current data acquisition circuit 404 is connected with an acquisition line interface A403 on the plastic shell 401.
The measuring host 2 comprises a data acquisition circuit 209, a data processing circuit 210, a lithium battery 212 and a display screen 208, wherein the data acquisition circuit 209, the data processing circuit 210 and the lithium battery 212 are arranged in the host shell 201, the data acquisition circuit 209 is communicated with the data processing circuit 210, the lithium battery 212 is connected with a lithium battery charging port 206 and a switch 202 on the host shell 201, the lithium battery 212 and the display screen 208 are both communicated with the data processing circuit 210, a USB interface 207 on the host shell 201 is connected with the data processing circuit 210, three voltage acquisition interfaces 203, two current acquisition interfaces 204 and one speed acquisition interface 205 which are communicated with the data acquisition circuit 209 are arranged on the host shell 201, the voltage acquisition interface 203 is connected with a traction machine three-phase line 11 in a traction machine three-phase line input box 10 through a voltage acquisition line, the current acquisition interface 204 is connected with an acquisition line interface A403 of a clamp ammeter 4 through a speed acquisition line, the speed acquisition interface 205 is connected with an acquisition line interface S303 of a device 3, the data acquisition circuit 209 is connected with a wireless data transmission module 211, and the data acquisition interface 203 is connected with a wireless data transmission module or a handheld computer control terminal 1201 through a wireless computer control terminal 12 or a wireless computer terminal 1201.
The invention relates to an elevator balance coefficient detection method, which comprises the following steps: during operation, no matter for the machine room or the machine room-less machine room, the test site is tested in the machine room or the machine room-less machine room of the elevator, no load is ensured in the elevator car 8 and the elevator car 8 is stopped at the topmost layer during test, then the electric control cabinet manually cuts off the power supply, one end of three voltage acquisition lines (a red voltage acquisition line 501, a yellow voltage acquisition line 502 and a green voltage acquisition line 503) and two current acquisition lines (a red current acquisition line 504 and a yellow current acquisition line 505) are respectively connected with the three voltage acquisition interfaces 203 and the two current acquisition interfaces 204 of the measuring host 2, the other ends of the three voltage acquisition lines (the red voltage acquisition line 501, the yellow voltage acquisition line 502 and the green voltage acquisition line 503) are respectively connected with the three terminals of the three phase line 11 of the traction machine in the three-phase line input box 10 of the traction machine, the two current acquisition lines (the red current acquisition line 504, yellow current collection line 505) is respectively connected with the collection line interfaces A403 of two pincerlike ampere meters 4, the plastic housing 401 of one pincerlike ampere meter 4 (marked with red color) is manually pressed by hand, the spring 405 which can be retracted inside can open two C-shaped jaws of the current transformer 402, then the two C-shaped jaws are looped on the line of the traction machine three-phase line 11 corresponding to the red voltage collection line 501 and are loosened, at the moment, the two C-shaped jaws are tightly combined together, the two C-shaped jaw loops of the current transformer 402 of the other pincerlike ampere meter 4 (marked with yellow color) are similarly made to be positioned on the line of the traction machine three-phase line 11 corresponding to the yellow voltage collection line 502, the speed measuring device 3 is taken out from the box of the measuring host machine 2, one end of the speed collection line 506 is connected with the collection line interface S303 of the speed measuring device 3, the other end is connected with the speed acquisition interface 205 of the measuring host 2, the measuring host 2 and the speed measuring device 3 can be communicated in a wireless mode, then the magnet 306 of the speed measuring device 3 is adsorbed on the traction machine iron bracket 9 near the traction machine steel wire rope 7, the speed measuring wheel 301 is abutted against the traction machine steel wire rope 7 by adjusting the universal joint 305, the position of the measuring host 2 can be placed at the top end of the traction machine 6 or any position near the traction machine, the distance meter 1 is attached to the bottommost end of a hoistway by manual starting, the position of the light emitting of the distance measuring sensor 101 is observed by adjusting the camera 102 of the distance meter 1, the measuring point is ensured to be positioned on the lower surface of the elevator car 8, the distance L1 value is obtained, the position of the handheld control end 12 is taken out and placed outside the car door of the elevator car 8 of the topmost floor, at the moment, the measuring stage is ready to be entered, the power switch is manually turned on by the electric control cabinet, simultaneously, a switch 202 of the measuring host 2 is started, the rated load Q value of the elevator is manually input, the worm gear type or permanent magnet synchronous type of the measured traction machine 6 is selected, the rated speed S of the elevator is input, finally, after the wire rope winding W value is input, the elevator car 8 is started to work from the topmost layer to the bottommost layer in the next step, at the moment, three voltage acquisition lines (a red voltage acquisition line 501, a yellow voltage acquisition line 502 and a green voltage acquisition line 503) and two current acquisition lines (a red current acquisition line 504 and a yellow current acquisition line 505) acquire voltages V1, V2, V3 and currents A1 and A2 of the three phase lines 11 of the traction machine in real time in the whole process, real-time signal data are transmitted to a data acquisition circuit 209 of the measuring host 2, meanwhile, the traction machine 6 drives the traction machine wire rope 7 to move due to the operation of the elevator car 8, the speed measuring wheel 301 of the speed measuring device 3 rotates along with the rotation of the traction machine wire rope 7, the speed measuring sensor 302 transmits signals of real-time running acceleration a1 and elevator downlink speed Vd to the data acquisition circuit 209 of the measuring host 2, the data is finally transmitted to the display screen 208 through the data processing circuit 210, the wireless data transmission module 211 is also used for realizing wireless signal communication with the wireless data receiving module 1201 of the handheld control end 12, the data is transmitted to the handheld control end 12, the result of the measuring process data can be copied out through the USB interface 207, when the elevator car 8 runs to the bottommost end, the position of the light output by the distance measuring sensor 101 is observed through the camera 102 of the adjusting distance meter 1, the measuring point is ensured to be on the lower surface of the elevator car 8, the distance L2 value is obtained, the values of the downlink L1 and L2 are input on the special measuring software of the handheld control end 12, the difference value of L1-L2 is the downlink travel Ld, then the elevator car 8 is started again to work from the bottommost layer to the topmost layer, at this time, three voltage acquisition lines (red voltage acquisition line 501, yellow voltage acquisition line 502, green voltage acquisition line 503) and two current acquisition lines (red current acquisition line 504, yellow current collection line 505) collects the voltages V4, V5, V6 and the currents A3, A4 of the three phase line 11 of the traction machine in real time during the whole process, and sends real-time signal data to the data collection circuit 209 of the measurement host 2, meanwhile, as the elevator car 8 works, the traction machine 6 drives the traction machine wire rope 7 to move, the speed measuring wheel 301 of the speed measuring device 3 rotates along with the rotation due to the close contact with the traction machine wire rope 7, the speed sensor 302 transmits the real-time running acceleration A2 and the elevator uplink speed Vu to the data acquisition circuit 209 of the measuring host 2, through arrangement calculation, finally, data is sent to the display screen 208 through the data processing circuit 210, and is also communicated with the wireless data receiving module 1201 of the handheld control end 12 through the wireless data transmitting module 211, the data is sent to the handheld control end 12, or the result of the measuring process data is copied out through the USB interface 207, when the elevator car 8 runs to the topmost end, whether the light position of the ranging sensor 101 is on the lower surface of the elevator car 8 at the measuring point is observed through the camera 102 of the range finder 1, a distance L3 value is obtained, the uplink L3 and L2 values are input on the special measuring software of the handheld control end 12, the difference value of L3-L2 is the uplink range Lu, the downlink currents A1, A2, V3 and an uplink current A3, vd 4, the downlink power V4 and an uplink power conversion algorithm operation, and the downlink power conversion value of the elevator car 1, the downlink power conversion value of the elevator car 2, the uplink power conversion value of the elevator car 1 and the downlink power conversion value of the elevator car 2 are calculated, and the downlink power value of the elevator speed Nu is calculated, and the uplink speed of the elevator car is compared with the uplink speed value of the elevator car 1 and the elevator car is calculated by comparing the uplink speed value of the downlink power V4 with the downlink power of the elevator car speed V1 and the elevator speed V2:
the traditional kinematics model for building the downlink power and the speed of the elevator based on the principle of energy conservation is shown as a formula (1):
wherein N is the input power of the motor (the output power of the frequency converter); v is the running speed of the elevator; η is the efficiency, which is the product of the motor efficiency and the total mechanical efficiency, and data shows that the motor efficiency is typically between 80% and 90% and the total mechanical efficiency is typically also between 80% and 90%, so η is between 64% and 81%; q is the rated load of the elevator; g is gravitational acceleration.
The delay detection algorithm adopts an error least square method, and an offset value with the minimum error is selected as shown in a formula (2).
Wherein the offset is a delay value, the time interval of data acquisition is 250ms, the offset is equal to 1, the delay is 250ms, and n is the number of data acquired in one uplink or downlink.
According to the formula (2), E is calculated from 0 to 20 by each offset, the offset corresponding to the smallest E value is the delay value, and the power curve and the speed curve are basically synchronous after the delay is eliminated.
The precondition of the balance coefficient calculation is that a kinematic model of the elevator needs to be established, and a more accurate downlink kinematic model of the elevator is shown as a formula (3).
Calculating balance coefficient K by using parameter identification method
Firstly, respectively establishing a downlink motion model and an uplink motion model as shown in a formula (4) and a formula (5).
Wherein Nd is the input power (output power of a frequency converter) of an elevator descending motor, eta d is the efficiency of the elevator descending motor multiplied by the total mechanical efficiency, and Vd is the elevator descending speed; nu is the power generated by the input power of the elevator ascending motor (the output power of the frequency converter), eta u is the power generation efficiency of the elevator ascending motor multiplied by the total mechanical efficiency, vu is the elevator ascending speed, g is the gravity acceleration, Q is the rated load of the elevator, K is the balance coefficient,,/>equation (6) can be obtained by equation (4) and equation (5) assuming that ηd=ηu=η.
Kd and Ku can be obtained by a system identification method for the formula (4) and the formula (5), eta can be obtained by calculation of the formula (6), and the balance coefficient K can be calculated by Kd, ku and eta.
Calculating a balance coefficient K by adopting an energy consumption balance method:
the total energy consumed for the elevator down-going is converted into potential energy of the counterweight end, and the potential energy of the elevator up-going counterweight end is converted into electric energy (motor power generation), so that the formula (8) and the formula (9) can be obtained.
Wherein Pd is total power consumption of elevator downlink, pu is total power generation of elevator uplink, ld is elevator downlink, lu is elevator uplink, eta is efficiency, g is gravity acceleration, Q is rated load of the elevator, K is balance coefficient, and a formula (10) can be obtained based on a formula (8) and a formula (9).
Based on the formula (8), the formula (9) and the formula (10), since the elevator goes down and then the elevator goes up to the top floor, the mechanical potential energy increases to 0, and the difference between the consumed electric energy and the generated electric energy is the loss, and the formula (11) can be obtained assuming that the losses of the elevator going up and the elevator going down are the same.
Since Pu is the total power generation amount of the elevator, pd can be calculated based on the formula (11) and the formula (10), and the balance coefficient K can be calculated based on the formula (8) and the formula (9) since Pd, pu, ld, lu, g, Q are known.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should be covered by the protection scope of the present invention by making equivalents and modifications to the technical solution and the inventive concept thereof.
Claims (2)
1. The elevator balance coefficient detection method is characterized by comprising the following steps of:
a. stopping the elevator car on the top layer, and measuring the height L1 of the lower surface of the elevator car;
b. starting an elevator car, moving from a top layer to a bottom layer, measuring elevator car downlink currents A1 and A2, downlink voltages V1, V2 and V3, elevator real-time running acceleration A1 and downlink speed Vd, and measuring the height L2 of the lower surface of the elevator car;
c. calculating a downlink travel ld=l1-L2;
d. starting an elevator car, moving from a bottom layer to a top layer, measuring the elevator car uplink currents A3 and A4, uplink voltages V4, V5 and V6, the elevator real-time running acceleration a2 and the uplink speed Vu, and measuring the elevator car lower surface height L3;
e. calculating an uplink stroke lu=l3-l2;
f. calculating a balance coefficient K by adopting a parameter identification method:
firstly, respectively establishing a downlink motion model and an uplink motion model as shown in a formula (4) and a formula (5),
，
，
wherein Nd is the input power of the elevator descending motor, eta d is the efficiency of the elevator descending motor multiplied by the total mechanical efficiency, and Vd is the elevator descending speed; nu is the power generated by the input power of the elevator ascending motor, eta u is the power generation efficiency of the elevator ascending motor multiplied by the total mechanical efficiency, vu is the elevator ascending speed, g is the gravity acceleration, Q is the rated load of the elevator, K is the balance coefficient,,/>it can be assumed that ηd=ηu=η, equation (6) is obtained by equation (4) and equation (5),
kd and Ku can be obtained by adopting a system identification method for the formula (4) and the formula (5), using equation (6), η can be calculated, and with Kd, ku and η, the balance coefficient K can be calculated.
2. The elevator balance coefficient detection method is characterized by comprising the following steps of:
a. stopping the elevator car on the top layer, and measuring the height L1 of the lower surface of the elevator car;
b. starting an elevator car, moving from a top layer to a bottom layer, measuring elevator car downlink currents A1 and A2, downlink voltages V1, V2 and V3, elevator real-time running acceleration A1 and downlink speed Vd, and measuring the height L2 of the lower surface of the elevator car;
c. calculating a downlink travel ld=l1-L2;
d. starting an elevator car, moving from a bottom layer to a top layer, measuring the elevator car uplink currents A3 and A4, uplink voltages V4, V5 and V6, the elevator real-time running acceleration a2 and the uplink speed Vu, and measuring the elevator car lower surface height L3;
e. calculating an uplink stroke lu=l3-l2;
f. calculating a balance coefficient K by adopting an energy consumption balance method:
the total energy consumed by the elevator in the downstream direction is converted into the potential energy of the counterweight end, and the potential energy of the elevator in the upstream direction is converted into electric energy, so that the formula (8) and the formula (9) can be obtained,
wherein Pd is total power consumption of elevator downlink, pu is total power generation of elevator uplink, ld is elevator downlink, lu is elevator uplink, eta is efficiency, g is gravity acceleration, Q is rated load of elevator, K is balance coefficient, formula (10) can be obtained based on formula (8) and formula (9),
based on the formula (8), the formula (9) and the formula (10), since the elevator goes down and then the elevator goes up to the top floor, the mechanical potential energy increases to 0, and the difference between the consumed electric energy and the generated electric energy is the loss, the formula (11) can be obtained assuming that the losses of the elevator going up and the elevator going down are the same,
since Pu is the total power generation amount of the elevator, pd can be calculated based on the formula (11) and the formula (10), and the balance coefficient K can be calculated based on the formula (8) and the formula (9) since Pd, pu, ld, lu, g, Q are known.
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