JP5095223B2 - Elevator equipment - Google Patents

Description

  The present invention relates to an elevator apparatus that can change the traveling speed of a car in accordance with the loading state of the car.

  In a conventional elevator control device, the speed at the time of traveling at a constant speed and the acceleration / deceleration speed at the time of acceleration / deceleration traveling are changed within the driving range of the motor and the electric equipment that drives the motor according to the load amount of the car. Thereby, the remaining power of a motor is utilized and the operation efficiency of a cage | basket | car is improved (for example, refer patent document 1).

JP 2003-238037 A

  However, in the conventional elevator control device, the speed pattern is changed based on the load of the car detected by the weighing device. Therefore, if the detection error of the weighing device or the loss during running is large, the motor or inverter is driven. The burden on the equipment sometimes increased. Also, if the error of the scale device and loss during running are estimated in advance and the speed pattern is calculated, when the actual error or loss is small, the car will run at a speed slower than the speed that can be demonstrated and driven. The ability of the device cannot be fully exerted.

  The present invention has been made to solve the above-described problems, and provides an elevator apparatus capable of operating a car with higher efficiency while preventing a driving device from being overloaded. With the goal.

  The elevator apparatus according to the present invention includes a drive means having a drive sheave, a motor for rotating the drive sheave, and a motor drive unit for driving the motor, a suspension means wound around the drive sheave, and suspended by the suspension means. And a control means for controlling the motor driven by the car and the counterweight, and the control means monitors the load of at least one device in the drive means while the car is running, and the state of the load. In response to this, a control command relating to the traveling speed of the car is generated and output to the motor drive unit.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the elevator apparatus by Embodiment 1 of this invention. It is a flowchart which shows the speed limit determination operation | movement by the speed command production | generation part of FIG. It is a graph which shows the time change of the running speed of a cage | basket | car, acceleration, a running mode, and a speed restriction state when not receiving the speed restriction by the speed command generation part of FIG. It is a graph which shows the time change of the running speed of a cage | basket | car, acceleration, a running mode, and a speed restriction state at the time of receiving the speed restriction | limiting by the speed instruction | command production | generation part of FIG. It is a flowchart which shows the mode switching operation | movement by the speed command generation part of FIG. It is a graph which shows the time change of the load condition of the apparatus of the drive means at the time of making a car drive | work by the mode switching operation | movement of FIG. It is a graph which shows the time change of the load condition of the apparatus of the drive means in the elevator apparatus by Embodiment 2 of this invention, and a car speed. It is a block diagram which shows the elevator apparatus by Embodiment 3 of this invention. It is explanatory drawing which shows an example of the change of the switching duty detected by the duty detection part of FIG. It is a block diagram which shows the elevator apparatus by Embodiment 4 of this invention. It is a block diagram which shows the elevator apparatus by Embodiment 5 of this invention. It is a block diagram which shows the elevator apparatus by Embodiment 6 of this invention. It is a block diagram which shows the elevator apparatus by Embodiment 7 of this invention. It is a block diagram which shows the elevator apparatus by Embodiment 8 of this invention. It is a graph which shows the time change of the voltage of the smoothing capacitor of FIG. 14, the ON / OFF state of a regeneration switch, and the ON ratio of a regeneration switch. It is a graph which shows the power consumption of the regeneration resistance of FIG. 14, and the time change of the speed of a cage | basket | car. It is a block diagram which shows the elevator apparatus by Embodiment 9 of this invention. It is a block diagram which shows the elevator apparatus by Embodiment 10 of this invention. It is a graph which shows an example of the setting method of the emitted-heat amount threshold value in the variable reference | standard device of FIG. It is a graph which shows the control method of the car speed in the elevator apparatus by Embodiment 11 of this invention.

Preferred embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing an elevator apparatus according to Embodiment 1 of the present invention. The car 1 and the counterweight 2 are moved up and down in the hoistway by the hoisting machine 3. The hoisting machine 3 includes a motor 4, a drive sheave 5 rotated by the motor 4, a speed detector 6 for detecting the rotation speed and magnetic pole position of the motor 4, and a brake for braking the rotation of the drive sheave 5 (see FIG. Not shown). For example, an encoder or a resolver is used as the speed detector 6.

  A plurality of main ropes 7 (only one is shown in the figure) as suspension means for suspending the car 1 and the counterweight 2 are wound around the drive sheave 5. In addition, as a suspension means, a normal rope or a belt-shaped rope etc. can be used, for example.

  Electric power from the power source 10 is supplied to the motor 4 via the converter 8 and the inverter 9. Converter 8 converts an alternating voltage from power supply 10 into a direct voltage. The inverter 9 generates an alternating current having an arbitrary voltage and frequency from the direct-current voltage generated by the converter 8. Moreover, the inverter 9 produces an alternating current by switching a direct current voltage.

  A smoothing capacitor 11 that smoothes the DC output from the converter 8 is connected between the converter 8 and the inverter 9. A regenerative resistor 12 and a regenerative switch 13 are connected to the smoothing capacitor 11 in parallel. The value of the current supplied from the inverter 9 to the motor 4 is detected by the current detector 14.

  The regenerative resistor 12 consumes the electric power regenerated during the regenerative operation of the hoisting machine 3 as heat. For this reason, when the voltage of the smoothing capacitor 11 exceeds the reference value, the regenerative switch 13 is turned ON, and a current flows through the regenerative resistor 12.

  When the regenerative switch 13 is ON, a current flows through the regenerative resistor 12 and the voltage of the smoothing capacitor 11 decreases. When the voltage of the smoothing capacitor 11 falls below a predetermined value, the regenerative switch 13 is turned OFF, the energization to the regenerative resistor 12 is stopped, and the voltage drop of the smoothing capacitor 11 is stopped.

  In this way, the DC input voltage to the inverter 9 is controlled within a specified range by turning on / off the regenerative switch 13 according to the voltage of the smoothing capacitor 11. For example, a semiconductor switch can be used as the regenerative switch 13.

  The motor drive unit 15 that drives the motor 4 includes a converter 8, an inverter 9, a smoothing capacitor 11, a regenerative resistor 12, a regenerative switch 13, and a circuit breaker (not shown) that opens and closes the current input to the inverter 9. Yes. The driving means 16 for raising and lowering the car 1 and the counterweight 2 includes a hoisting machine 3 and a motor driving unit 15.

  The inverter 9 is controlled by the control means 17. The control means 17 has a speed command generator 18, a speed controller 19 and a current controller 20. The speed command generation unit 18 generates a speed command for the car 1, that is, a speed command for the hoisting machine 3, in response to call registration from the landing or the car 1.

  Based on the speed command generated by the speed command generation unit 18 and the information from the speed detector 6, the speed control unit 19 calculates a torque value so that the rotation speed of the motor 4 matches the value of the speed command. Torque command is generated.

  The current control unit 20 controls the inverter 9 based on the current detection signal from the current detector 14 and the torque command from the speed control unit 19. Specifically, the current control unit 20 converts the torque command from the speed control unit 19 into a current command value, and sets the inverter 9 so that the current value detected by the current detector 14 matches the current command value. Outputs a driving signal.

  Vector control is used for current control of the inverter 9 by the current control unit 20. That is, the current control unit 20 responds to the current command value converted from the torque command, the current value of the motor 4 detected by the current detector 14, and the magnetic pole position (rotational position) detected by the speed detector 6. Thus, the voltage value to be output by the inverter 9 is calculated, and an ON / OFF switching pattern is output to the transistor built in the inverter 9.

  The control means 17 is constituted by a computer having an arithmetic processing unit (CPU), a storage unit (ROM, RAM, hard disk, etc.) and a signal input / output unit. That is, the functions of the speed command generation unit 18, the speed control unit 19, and the current control unit 20 are realized by a computer.

  Here, the control means 17 generates a speed command so that the maximum speed and acceleration of the car 1 are increased as much as possible within the allowable range of the driving means 16 and the traveling time of the car 1 is shortened. Therefore, the control means 17 monitors the load of at least one device in the drive means 16 while the car 1 is traveling, and immediately gives a control command relating to the traveling speed of the car 1 based on the monitored load. Generate (in real time). Further, the control means 17 increases the traveling speed of the car 1 until the monitored load reaches a preset threshold when the car 1 starts to travel. The control command relating to the traveling speed means a command for changing the speed of the car 1, such as a speed command for the car 1, a speed command for the hoisting machine 3, and the like.

  The traveling speed of the car 1 is limited to an upper limit value (Vmax) defined by the performance of safety devices such as a shock absorber, a brake, an emergency stop device, and a speed governor (all not shown). Therefore, if the load monitored by the control means 17 does not reach the threshold value, the speed of the car 1 is shifted to constant speed running at Vmax.

  The speed command generator 18 in the first embodiment monitors, for example, the current value of the motor 4, that is, the current value detected by the current detector 14 as the load of the driving device. Then, when the current value of the motor 4 reaches a preset threshold value while the car 1 is accelerating, the speed command generator 18 generates a control command so that the car 1 runs at a constant speed.

  FIG. 2 is a flowchart showing the speed limit determination operation by the speed command generator 18 of FIG. The speed command generator 18 determines whether or not the car 1 is traveling (step S1). If the car 1 is traveling, it determines whether or not the load of the monitored device has reached a threshold value (step S2). ). If the car 1 is not running and if the load has not reached the threshold value, the speed limit is released (step S3). If the load reaches a threshold value during traveling of the car 1, the traveling speed of the car 1 is limited to a speed lower than Vmax. The speed command generator 18 repeatedly executes such speed limit determination operation at a predetermined cycle.

  FIG. 3 is a graph showing changes over time in the traveling speed, acceleration, traveling mode, and speed limit state of the car 1 when the speed command generating unit 18 of FIG. 1 is not subjected to speed limitation, and FIG. 4 is a speed command generating unit of FIG. 18 is a graph showing changes over time in the traveling speed, acceleration, traveling mode, and speed limiting state of the car 1 when subjected to speed limitation by 18;

  3 and 4, MODE1 is a state (stop state) where no start command is input and speed command = 0. MODE2 is a state where acceleration> 0 and jerk> 0. MODE3 is a state where acceleration> 0 and jerk = 0. MODE 4 is a state where acceleration> 0 and jerk <0. MODE 5 is a constant speed state. MODE 6 is in a state where acceleration <0 and jerk <0. MODE 7 is in a state where acceleration <0 and jerk = 0. MODE 8 is a state where acceleration <0 and jerk> 0. Further, the acceleration in MODE 7 is a preset maximum deceleration rate αd.

  If the load of the device does not reach the threshold during acceleration in MODE 3, as shown in FIG. 3, the mode is shifted to MODE 4 (acceleration rounding) at a preset speed Va, and thereafter, constant speed traveling at a speed Vmax (MODE 5). It is transferred to.

  On the other hand, when the load of the device reaches a threshold value during acceleration in MODE 3, as shown in FIG. 4, the mode is shifted to MODE 4 (acceleration rounding) at that time, and thereafter, constant speed running (MODE 5 at a speed lower than speed Vmax). ).

  Next, FIG. 5 is a flowchart showing the mode switching operation by the speed command generator 18 of FIG. The speed command generator 18 repeatedly executes a mode switching operation as shown in FIG. 5 at a predetermined cycle (a time sufficiently shorter than the traveling time of the car 1; for example, 50 msec). In the mode switching operation, it is first determined whether or not a start command has been input to the control means 17 (step S11). If no start command is input, the acceleration α = 0, the speed V = 0, and MODE = 1 are set (step S12). Thereafter, the speed command generator 18 calculates the speed command Vc by substituting the acceleration α = 0 and the speed V = 0 into the equation (1) (step S13).

  Vc = V + α · ts (1)

  Thereafter, the speed command generator 18 outputs the calculated speed command Vc to the speed controller 19 (step S14), and ends the calculation of the cycle.

  When a start command is input, the speed command generator 18 determines whether MODE = 1 (step S15). When MODE = 1, it is the first calculation after the start command is input, so MODE = 2 is set. At this time, the acceleration α is set according to the equation (2), and the transition speed Va when shifting from MODE = 3 to MODE = 4 is set according to the equation (3) (step S16).

α = α + j · ts (2)
Va = Vmax−α ² / (2 · j) (3)

  Here, j is the jerk, Vmax is the maximum speed in the speed command, and ts is the calculation cycle. Also, the acceleration α of the previous calculation is substituted for α on the right side of the equation (2).

  Thereafter, the speed command generation unit 18 executes Expression (1) (step S13). At this time, the velocity command Vc of the previous calculation is substituted for the velocity V on the right side of the equation (1), and the acceleration α obtained by the equation (2) is substituted for the acceleration α. Thereby, a new speed command Vc is calculated. Thereafter, the speed command generator 18 outputs the calculated speed command Vc to the speed controller 19 (step S14), and ends the calculation of the cycle.

  Next, when MODE = 1 is not satisfied, the speed command generator 18 determines whether MODE = 2 is satisfied (step S17). If MODE = 2, the speed command generator 18 determines whether or not the acceleration α has reached the maximum acceleration αa (step S18). If the maximum acceleration αa has not been reached, the acceleration α is set by equation (2) and the transition speed Va is set by equation (3). Then, MODE = 2 is maintained (step S16).

  On the other hand, when the acceleration α reaches the maximum acceleration αa, the mode shifts to MODE = 3 while maintaining the acceleration α and the transition speed Va (step S19).

  Thereafter, the speed command generator 18 calculates a speed command Vc in the calculation cycle (step S13), outputs the speed command Vc to the speed controller 19 (step S14), and ends the calculation of the cycle. .

  Next, when it is not MODE = 2, the speed command generator 18 determines whether MODE = 3 (step S20). When MODE = 3, the speed command generator 18 needs to limit the speed according to whether or not the speed command Vc is the transition speed Va and the load of the device in the driving unit 16 has reached the threshold value. It is determined whether or not (step S21). If the transition speed Va has not been reached and speed limitation is not required, the acceleration α and the transition speed Va are maintained, and MODE = 3 is maintained (step S19). When the transition speed Va is reached and speed limitation is necessary, the acceleration α is set according to the equation (4), and the process proceeds to MODE = 4 (step S22). Note that the acceleration α of the previous calculation is substituted for the acceleration α on the right side of the equation (4).

  α = α−j · ts (4)

  Thereafter, the speed command generator 18 calculates a speed command Vc in the calculation cycle (step S13), outputs the speed command Vc to the speed controller 19 (step S14), and ends the calculation of the cycle. .

  Next, when MODE = 3 is not satisfied, the speed command generator 18 determines whether MODE = 4 is satisfied (step S23). If MODE = 4, the speed command generator 18 determines whether or not the acceleration α has reached 0 (step S24). If the acceleration α has not reached 0, the acceleration α is set by the equation (4) and MODE = 4 is maintained (step S22). If the acceleration α has reached 0, the acceleration α is set to 0 and the process proceeds to MODE = 5 (step S25).

  Thereafter, the speed command generator 18 calculates a speed command Vc in the calculation cycle (step S13), outputs the speed command Vc to the speed controller 19 (step S14), and ends the calculation of the cycle. .

  Next, when MODE = 4 is not true, the speed command generator 18 determines whether MODE = 5 (step S26). If MODE = 5, the speed command generator 18 determines whether or not the car 2 has reached the deceleration start position (step S27). If the deceleration start position has not been reached, the acceleration α is kept at 0 and MODE = 5 is maintained (step S25). If the deceleration start position has been reached, the acceleration α is set according to equation (4), and the process proceeds to MODE = 6 (step S28).

  Thereafter, the speed command generator 18 calculates a speed command Vc in the calculation cycle (step S13), outputs the speed command Vc to the speed controller 19 (step S14), and ends the calculation of the cycle. .

  Next, if it is not MODE = 5, the speed command generator 18 determines whether MODE = 6 (step S29). If MODE = 6, the speed command generator 18 determines whether or not the acceleration α has reached a preset maximum deceleration rate αd (step S30). If the maximum deceleration αd has not been reached, the acceleration α is set according to equation (4) and MODE = 6 is maintained (step S28). When the maximum deceleration αd is reached, the acceleration α is set to the maximum deceleration αd and MODE = 7 is set (step S31).

  Thereafter, the speed command generator 18 calculates a speed command Vc in the calculation cycle (step S13), outputs the speed command Vc to the speed controller 19 (step S14), and ends the calculation of the cycle. .

  Next, when MODE = 6 is not true, the speed command generator 18 determines whether MODE = 7 (step S32). If MODE = 7, the speed command generator 18 determines whether or not the car 2 has reached the landing start position (step S33). If the landing start position has not been reached, the acceleration α remains at the maximum deceleration αd, and MODE = 7 is maintained (step S31).

  Thereafter, the speed command generator 18 calculates a speed command Vc in the calculation cycle (step S13), outputs the speed command Vc to the speed controller 19 (step S14), and ends the calculation of the cycle. .

  When the landing start position is reached, the speed command generator 18 calculates the speed command Vc based on the distance to the landing position of the car 2 and shifts to MODE = 8 (step S34). . Thereafter, the speed command generator 18 outputs the calculated speed command Vc to the speed controller 19 (step S14), and ends the calculation of the cycle.

  FIG. 6 is a graph showing the load state of the device of the driving means 16 and the time change of the car speed when the car 1 is run by the mode switching operation of FIG. The threshold A is set to a value lower than the allowable load B of the device. That is, a predetermined margin is provided between the threshold A and the allowable value B.

  As shown in FIG. 6, when the load reaches the threshold value A at time t1, the acceleration is reduced and then the vehicle shifts to constant speed running. The load of the device increases after time t1, but decreases before reaching the allowable value B, and stabilizes at a value lower than the allowable value B.

  In such an elevator apparatus, the speed pattern is not generated at the start of traveling according to the load in the car, but the load of at least one device in the driving means 16 is monitored while the car 1 is traveling, Since the control command relating to the traveling speed of the car 1 is generated and output to the motor drive unit 15 according to the state, the car 1 can be operated with higher efficiency while preventing the driving device from being overloaded. .

Further, the control means 17 continuously increases the traveling speed of the car 1 after the start of the traveling of the car 1, and decreases the acceleration of the car 1 when the monitored load reaches a threshold value. Can be further improved.
Furthermore, since the control means 17 increases the acceleration with a predetermined jerk until the acceleration of the car 1 reaches a predetermined acceleration after the start of traveling of the car 1, the driving efficiency of the car 1 can be further improved.
Furthermore, when the load reaches a threshold value during acceleration running of the car 1, the control means 17 generates a control command so that the car 1 runs at a constant speed, so that the drive device is more overloaded. It can be surely prevented.

Embodiment 2. FIG.
Next, FIG. 7 is a graph showing the time change of the load state and the car speed of the drive means of the driving means in the elevator apparatus according to Embodiment 2 of the present invention. The overall structure of the apparatus is the same as that of Embodiment 1 (FIG. 1). It is the same. The threshold value A ′ is set to a value lower than the allowable load value B of the device. That is, a predetermined margin is provided between the threshold value A ′ and the allowable value B.

  In the second embodiment, the control means 17 generates a control command, that is, a speed command so that the load is maintained at the threshold value A ′ when the load reaches the threshold value A ′ during the acceleration traveling of the car 1. In FIG. 7, the load reaches the threshold value A 'at time t2, but the car speed gradually increases thereafter. Other configurations and control methods are the same as those in the first embodiment.

  In such an elevator apparatus, when the load of the device of the driving means 16 reaches the threshold value A ′, a speed command is generated so that the load follows the threshold value A ′, so that the threshold value A ′ is close to the allowable value B. Can be set. Therefore, driving efficiency can be further improved.

  In the above example, the motor current is exemplified as the load of the device monitored by the control means 17, but it is needless to say that the present invention is not limited to this.

  For example, the load monitored by the control means may be a motor voltage or a motor temperature. The motor voltage can be detected by a voltage detector provided in the motor. Moreover, you may use the voltage command value with respect to the inverter produced | generated within a control means instead of the detected value of a motor voltage. Furthermore, the motor temperature can be detected by a temperature detector provided in the motor. The motor temperature can also be estimated from a value obtained by integrating the motor current.

  The load monitored by the control means may be the inverter current, temperature, switching duty, and output voltage. The inverter current can be detected by a current detector provided in the inverter. The inverter temperature can be detected by a temperature detector provided in the inverter. Further, the inverter temperature can be estimated from a value obtained by integrating the inverter current. Furthermore, the switching duty of the inverter can be obtained from the voltage command value for the inverter generated in the control means. The output voltage of the inverter can be detected by a voltage detector provided in the inverter. Furthermore, instead of the detected value, a voltage command value for the inverter generated in the control means may be used.

Furthermore, the load monitored by the control means may be at least one of a d-axis current and a q-axis current obtained by converting the current supplied to the motor into an orthogonal coordinate system.
Furthermore, the load monitored by the control means may be at least one of a d-axis current command and a q-axis current command in an orthogonal coordinate system generated to control the inverter.

  The load monitored by the control means may be electric power supplied from the inverter to the motor. Such electric power can be obtained by q-axis current (or q-axis current command) × car speed (or speed command value). Moreover, electric power can be calculated | required by current measurement value (or current command value) x speed measurement value (or speed command value). The power can also be obtained by current measurement value (or current command value) × voltage measurement value (or voltage command value).

Furthermore, the load monitored by the control means may be the temperature of the regenerative resistor. The temperature of the regenerative resistor can be detected by a temperature detector provided in the regenerative resistor. The temperature of the regenerative resistor can also be estimated from the state of the regenerative switch (switching duty).
Furthermore, the load monitored by the control means may be regenerative electric power due to regenerative resistance. The regenerative power can be estimated from the state (switching duty) of the regenerative switch.

The load monitored by the control means may be a current flowing through a circuit breaker (breaker) connected between the inverter and the power source. The breaker current can be detected by a current detector provided in the breaker.
Further, the load monitored by the control means may be a DC voltage (DC bus voltage) input from the converter to the inverter. The input voltage of the inverter can be detected by a voltage detector.

  Furthermore, in the above example, the load on the device is individually monitored. However, a plurality of types of loads may be monitored in combination, and the acceleration may be decreased when any one of the loads reaches a threshold value. Further, a combination of a plurality of types of loads may be monitored, and the acceleration may be decreased when these combined loads reach a certain threshold value.

In the above example, the load on the device is directly monitored. However, the command value generated in the control means is compared with the actual drive state of the device, and the load on the device is indirectly estimated and monitored. It is also possible.
For example, the load can be estimated by comparing the current command value generated by the current control unit 20 of FIG. 1 with the current measurement value measured based on the signal from the current detector 14. In this case, monitor at least one of the difference between the current command value and the current measurement value and the differential value of the difference between the current command value and the current measurement value, and decrease the acceleration when the monitored value reaches the threshold value. You can do it.
Similarly, the load can be estimated by comparing the speed command value generated by the speed command generation unit 18 of FIG. 1 with the speed measurement value measured based on the signal from the speed detector 6. . In this case, monitor at least one of the difference between the speed command value and the speed measurement value and the differential value of the difference between the speed command value and the speed measurement value, and decrease the acceleration when the monitored value reaches the threshold value. You can do it.
It is also possible to indirectly estimate and monitor the load of the equipment based on the value of the car scale device. Even in this case, although there is an error in the scale device, there is no increase in the load on the driving device due to the travel loss. In addition, there is an advantage that the capability of the driving device can be fully exhibited as compared with a case where a driving loss is anticipated in advance.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described. In the third embodiment, the switching duty of the inverter 9 is monitored as the load of the device of the driving means 16.
FIG. 8 is a block diagram showing an elevator apparatus according to Embodiment 3 of the present invention. In the figure, the control means 17 has a duty detector 21 in addition to the speed command generator 18, the speed controller 19 and the current controller 20. The duty detection unit 21 detects a switching duty as a load of the inverter 9 based on a voltage command value to the inverter 9 generated by the current control unit 20. The switching duty is a ratio of the ON time of the inverter 9 within a predetermined sampling period.

  The speed command generator 18 monitors whether or not the switching duty of the inverter 9 detected by the duty detector 21 reaches a preset threshold while the car 1 is traveling. Then, when the switching duty reaches the threshold value, the speed limit is executed. Other configurations and control methods are the same as those in the first or second embodiment.

  FIG. 9 is an explanatory diagram showing an example of a change in switching duty detected by the duty detector 21 of FIG. In FIG. 9, the duty value Ti in the sampling period T is calculated by ΔTi / T.

  For example, when the car 1 is in a power running operation, such as when climbing with a capacity ride, the switching duty value gradually increases as the speed increases from the start of travel (ΔT1 / T <ΔT2 / T <ΔT3 / T <Δ T4 / T <ΔT5 / T).

In such an elevator apparatus, while the car 1 is traveling, the switching duty of the inverter 9 is monitored, and a speed command is instantly generated according to the state of the switching duty and output to the motor drive unit 15. The car 1 can be operated with higher efficiency while preventing the vehicle from being overloaded.
Here, the product of the switching duty and the bus voltage (inverter input voltage) is the motor voltage. Therefore, if the bus voltage fluctuation is small, voltage saturation of the motor 4 can be avoided in advance by monitoring the switching duty.

  The threshold may be set so that the switching duty does not exceed the allowable value according to the acceleration or acceleration rounding pattern, or the acceleration or acceleration rounding pattern may be set according to the threshold so that the switching duty does not exceed the allowable value. It may be set.

  Further, after setting the deceleration and the deceleration rounding pattern, a threshold may be set so that the switching duty does not exceed the allowable value, or after setting the threshold, the deceleration and the deceleration are set so that the switching duty does not exceed the allowable value. A deceleration rounding pattern may be set.

Furthermore, the threshold value may be reset for each run.
Furthermore, the threshold value may be switched between the power running operation and the regenerative operation of the motor 4. For example, if the regenerative resistor 12 has a thermal margin, the maximum speed and the driving torque can be increased during the regenerative operation than during the power running operation, and a more efficient operation can be performed.

  In addition, since there is a trade-off relationship between the threshold value and the deceleration / deceleration rounding pattern, it is preferable to set the threshold value, the deceleration / deceleration rounding pattern so that the traveling time is reduced.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the motor voltage is monitored as a load on the device of the driving unit 16.
FIG. 10 is a block diagram showing an elevator apparatus according to Embodiment 4 of the present invention. In the figure, a bus voltage detector 22 for detecting the bus voltage (DC voltage) smoothed by the smoothing capacitor 11 is provided between the converter 8 and the inverter 9.

  The control means 17 includes a voltage calculation unit 23 in addition to the speed command generation unit 18, the speed control unit 19, the current control unit 20, and the duty detection unit 21. The voltage calculation unit 23 calculates a voltage applied to the motor 4 from the bus voltage detected based on the signal from the bus voltage detector 22 and the switching duty detected by the duty detection unit 21.

  The speed command generator 18 monitors whether or not the motor voltage obtained by the voltage calculator 23 reaches a preset threshold value while the car 1 is traveling. When the motor voltage reaches the threshold value, the speed limit is executed. Other configurations and control methods are the same as those in the third embodiment.

  In such an elevator apparatus, even when the bus voltage fluctuates due to voltage fluctuations of the power supply 10, the applied voltage of the motor can be obtained with high accuracy, and the motor 4 can be more reliably prevented from being overloaded. it can.

Embodiment 5 FIG.
Next, a fifth embodiment of the present invention will be described. In the fifth embodiment, the motor voltage is monitored as a load on the device of the driving unit 16.
FIG. 11 is a block diagram showing an elevator apparatus according to Embodiment 5 of the present invention. In the figure, the control means 17 has a voltage calculation unit 24 in addition to the speed command generation unit 18, the speed control unit 19 and the current control unit 20. The voltage calculation unit 24 calculates the voltage applied to the motor 4 based on the signals from the speed detector 6 and the current detector 14. In general, the motor voltage can be obtained by calculation from the current value, the rotation speed, and the magnetic pole position.

  The speed command generator 18 monitors whether the motor voltage obtained by the voltage calculator 24 reaches a preset threshold value while the car 1 is traveling. When the motor voltage reaches the threshold value, the speed limit is executed. Other configurations and control methods are the same as those in the first or second embodiment.

  In such an elevator apparatus, while the car 1 is traveling, the motor voltage is monitored, and a speed command is instantly generated according to the state of the motor voltage and is output to the motor drive unit 15. The car 1 can be operated with higher efficiency while preventing the vehicle from entering the state.

  Here, when a permanent magnet synchronous motor is used as the motor 4, the motor voltage increases mainly depending on the rotational speed. In addition, since the motor 4 cannot be operated at a speed at which the motor voltage exceeds the voltage value that can be output from the inverter 9, the speed control is performed when the motor voltage reaches the upper limit value of the voltage that can be output from the inverter 9. Deterioration or electromagnetic noise due to current distortion may occur.

  In the fifth embodiment, the motor voltage threshold is set based on the maximum voltage that can be output from the inverter 9. Then, when the motor voltage exceeds the threshold value, the speed command generation unit 18 outputs an acceleration rounding command value and shifts to constant speed travel. Then, the deceleration command value is calculated at the deceleration start point, and the car 1 is stopped. Note that the motor voltage temporarily increases between the acceleration rounding start time and the constant speed. In this case, the threshold value is set so that the motor voltage does not exceed the allowable value. As described above, the driving speed can be increased while preventing the deterioration of the riding comfort due to the deterioration of the speed control of the motor 4 due to the lack of the output voltage of the inverter 9 and the electromagnetic noise.

Embodiment 6 FIG.
Next, a sixth embodiment of the present invention will be described. In the sixth embodiment, the load on the device of the driving means 16 is indirectly monitored from the difference between the current command value and the current measurement value.
12 is a block diagram showing an elevator apparatus according to Embodiment 6 of the present invention. In the figure, the speed command generation unit 18 compares the current command value generated by the current control unit 20 with the current measurement value measured based on the signal from the current detector 14, thereby reducing the load of the driving device. presume. Specifically, the speed command generator 18 monitors and monitors at least one of the difference between the current command value and the current measurement value and the differential value of the difference between the current command value and the current measurement value. When the value reaches the threshold value, the speed limit is executed. Other configurations and control methods are the same as those in the first or second embodiment.

  Here, when the current, voltage, and power of the motor 4 are saturated due to the power source capacity and the motor capacity, the difference between the current command value and the current measurement value increases. Therefore, by monitoring at least one of the difference between the current command value and the current measurement value and the differential value of the difference between the current command value and the current measurement value, the motor 4 is prevented from being overloaded. be able to. Further, while the car 1 is traveling, the car 1 can be operated with higher efficiency by generating a speed command immediately and outputting it to the motor drive unit 15 while performing such monitoring.

Embodiment 7 FIG.
Next, a seventh embodiment of the present invention will be described. In the seventh embodiment, the load on the device of the driving means 16 is indirectly monitored from the difference between the speed command value and the speed measurement value.
FIG. 13 is a block diagram showing an elevator apparatus according to Embodiment 7 of the present invention. In the figure, the speed command generation unit 18 compares the speed command value generated by the speed command generation unit 18 with the speed measurement value measured based on the signal from the speed detector 6 to load the drive device. Is estimated. Specifically, the speed command generation unit 18 monitors and monitors at least one of a difference between the speed command value and the speed measurement value and a differential value of the difference between the speed command value and the speed measurement value. When the value reaches the threshold value, the speed limit is executed. Other configurations and control methods are the same as those in the first or second embodiment.

  Here, when the current, voltage, and power of the motor 4 are saturated due to the power supply capacity and the motor capacity, the difference between the speed command value and the speed measurement value increases. Therefore, by monitoring at least one of the difference between the speed command value and the speed measurement value and the differential value of the difference between the speed command value and the speed measurement value, the motor 4 is prevented from being overloaded. be able to. Further, while the car 1 is traveling, the car 1 can be operated with higher efficiency by generating a speed command immediately and outputting it to the motor drive unit 15 while performing such monitoring.

Embodiment 8 FIG.
Next, an eighth embodiment of the present invention will be described. In the eighth embodiment, the regenerative power of the regenerative resistor 12 is monitored as the load of the device of the drive unit 16.
FIG. 14 is a block diagram showing an elevator apparatus according to Embodiment 8 of the present invention. FIG. 15 shows changes over time in the voltage of the smoothing capacitor 11 in FIG. 14, the ON / OFF state of the regenerative switch 13, and the ON ratio of the regenerative switch 13. FIG. 16 is a graph showing the power consumption of the regenerative resistor 12 and the time change of the speed of the car 1 in FIG.

  In the figure, the DC voltage of the smoothing capacitor 11 is detected by a voltage detector 30. ON / OFF of the regenerative switch 13 is controlled by the switch command unit 32. As shown in FIG. 15, the switch command unit 32 generates an ON command signal for turning on the regenerative switch 13 when the DC voltage detected by the voltage detector 30 becomes higher than a preset voltage threshold Von. When it becomes lower than the voltage threshold Voff, an OFF command signal for turning off the regenerative switch 13 is generated.

  The power consumption calculation unit 34 calculates the power consumption of the regenerative resistor 12 based on the ON / OFF command signal from the switch command unit 32. Further, the power consumption calculation unit 34 sets the ON / OFF command signal of the switch command unit 32 to 100% for the ON state and 0% for the OFF state, and the smoothed regenerative switch 13 as shown in FIG. An output signal indicating the percentage of the ON state is obtained.

Furthermore, the power consumption calculation unit 34 includes a first-order lag primary filter (filter means) 34 a having an appropriate cutoff frequency, and a multiplier 34 c. The multiplier 34c multiplies the output signal of the primary filter 34c by a coefficient Von ² / R to obtain the power consumption (value related to power consumption) consumed by the regenerative resistor 12. Von ² / R is instantaneous power consumption consumed by the regenerative resistor 12, and R is an electric resistance value of the regenerative resistor 12.

  The comparison unit 35 includes a comparator 35a and a reference unit 35c. A power threshold Wn can be set in the reference device 35c. The comparator 35a compares the power consumption obtained by the multiplier 34c with the power threshold Wn preset in the reference unit 35c, and when the power consumption reaches the power threshold Wn, the command change signal is sent to the speed command generator 18. To enter.

  The power threshold Wn is set based on an allowable power value Wp that does not cause the regenerative resistor 12 to be overloaded. Specifically, as shown in FIG. 16, the power threshold value Wn includes the regenerative power consumption that increases between the acceleration rounding start time t1 and the constant speed travel, and the regenerative power consumption that temporarily increases from the deceleration start time t2. Is set so that the regenerative power consumption does not exceed the allowable power value Wp.

  As the regenerative resistor 12, a regenerative resistor 12 having a capacity that can be instantaneously consumed up to power with an ON ratio of the regenerative switch 13 of 100% is selected. However, in order to suppress the heat generation of the regenerative resistor 12, the regenerative power consumption is set to be equal to or lower than the rated power during continuous use of the regenerative resistor 12.

  The speed command generator 18 continues to generate a speed command value that continues a predetermined acceleration until a command change signal is input. Further, when the command change signal is input, the speed command generator 18 generates a speed command signal that causes the car 1 to travel at a constant speed from the accelerated state if the car 1 is in an accelerated state, and the car 1 is at a constant speed. When traveling and approaching the stop position, a speed command signal for decelerating and stopping is generated.

  Although omitted in the above embodiment, the rotational speed of the motor 4 is obtained by differentiating the signal from the speed detector (rotational position detector) 6 with a differentiator 37 or the like.

  The control means 17 of the eighth embodiment includes a speed command generator 18, a speed controller 19, a current controller 20, a power consumption calculator 34, a comparator 35, and a differentiator 37.

  Here, if the load on the car 1 side is larger than the load on the counterweight 2 and the car 1 is in a descending operation, the motor 4 is in a regenerative state. In the regenerative state, current flows from the motor 4 toward the inverter 9 and the smoothing capacitor 11 is charged. When the smoothing capacitor 11 is charged and the voltage of the smoothing capacitor 11 reaches the voltage threshold value Von, an ON command signal is input from the switch command unit 32 to the regenerative switch 13.

  When the regenerative switch 13 is turned on, a current flows through the regenerative resistor 12 and the regenerative resistor 12 generates heat, thereby reducing the voltage of the smoothing capacitor 11 to Voff. The relationship between the current and the voltage at the time of the voltage drop is a relationship in which the voltage varies with a first-order lag waveform because the regenerative resistor 12 and the smoothing capacitor 11 form a closed circuit.

  When the voltage of the smoothing capacitor 11 decreases to Voff, an OFF command signal is input from the switch command unit 32 to the regenerative switch 13. By repeating such an operation, the regenerative electric power of the motor 4 is consumed by the regenerative resistor 12. In addition, the DC input voltage to the inverter 9 is controlled within a specified range by turning the regenerative switch 13 on and off according to the voltage of the smoothing capacitor 11.

The primary filter 34a of the power consumption calculation unit 34 smoothes the pulsed ON / OFF command signal from the switch command unit 32 as shown in FIG. 15C, and outputs the smoothed signal. The smooth signal indicates the ratio of the ON time that is the time when the ON command signal of the ON / OFF command signal of the regenerative switch 13 is generated. Thereby, the average power consumption of the regenerative resistor 12 can be estimated. Accordingly, the average power consumption value can be obtained by multiplying the smoothing signal and the coefficient Von ² / R by the multiplication unit 34c.

  The comparator 35a compares the power consumption with the power threshold value Wn. When the power consumption exceeds the power threshold value Wn, the command change signal is input to the speed command generation unit 18. As shown in FIG. 16 (a), the power consumption gradually increases as the traveling of the car 1 starts and the speed increases. Then, the power consumption reaches the power threshold Wn at time t1 during traveling in the acceleration state.

  When the power consumption exceeds the power threshold value Wn, the comparator 35 a outputs a command change signal to the speed command generation unit 18. When the command change signal is input, if the car 1 is accelerating, the speed command generating unit 18 stops the acceleration and generates a speed command for shifting to a constant speed running. Output. At this time, it is preferable to switch from the acceleration state to the constant speed state with a smooth curve in consideration of the ride comfort of the passenger.

  When the car 1 travels at a constant speed and the car 1 arrives at the deceleration start point at time t2, the speed command generation unit 18 generates a speed command for decelerating and stopping the car 1, and thereby the car 1 is decelerated and stopped. Is done. Other configurations and control methods are the same as those in the first or second embodiment.

  In such an elevator apparatus, while the car 1 is traveling, the power consumption of the regenerative resistor 12 is monitored, and a control command relating to the traveling speed of the car 1 is generated and output to the motor drive unit 15 according to the state of power consumption. Therefore, the car 1 can be operated with higher efficiency while preventing the driving device from being overloaded.

In the eighth embodiment, the ratio of the ON time of the regenerative switch 13 is calculated using the primary filter 34a, but may be calculated using a high-order filter. Further, the ratio of the ON time may be obtained by detecting the ON time and the OFF time of the regenerative switch 13 within a preset time.
Alternatively, the multiplier 34c may be omitted, and the output of the primary filter 34a may be directly input to the comparison unit 35.

  Further, in the eighth embodiment, the current that flows when the regenerative switch 13 is turned on is approximated by Von / R 1. On the other hand, for example, a predetermined voltage between the ON start voltage Von and the OFF start voltage Voff is applied to the regenerative resistor 12 such as Voff / R or (Von + Voff) / R / 2. May be approximated as

  Furthermore, the amount of increase in the regenerative electric power becomes particularly large when the car 1 shifts from acceleration travel to constant speed travel and when it shifts from constant speed travel to deceleration travel. For this reason, the power threshold value Wn may be set in consideration of the increase amount. That is, a value obtained by subtracting the increase amount from the allowable power that can be regenerated by the regenerative resistor 12 may be set as the power threshold value Wn.

  The increase amount depends on the acceleration / deceleration of the car 1, the acceleration / deceleration depends on the motor torque generated by the motor 4, and the motor torque can be converted from the current of the motor 4. Therefore, the power threshold Wn may be calculated according to any one of acceleration / deceleration, torque, and current.

  Furthermore, the regenerative power that increases from the start of acceleration rounding to constant speed travel also depends on the acceleration rounding pattern when shifting to constant speed travel. That is, the longer the acceleration rounding time, the greater the increase in regenerative power. In addition, the regenerative power that temporarily increases at the start of deceleration depends on the deceleration rounding pattern when shifting to the deceleration travel. That is, the amount of increase in regenerative power increases as the deceleration rounding time is shorter. Therefore, the power threshold Wn may be set so that the regenerative power does not exceed the allowable value Wp according to the acceleration (deceleration) rounding pattern. Further, an acceleration (deceleration) rounding pattern may be set according to the power threshold value Wn so that the regenerative power does not exceed the allowable value Wp. Further, the power threshold value Wn may be reset for each run.

  Furthermore, the higher the power threshold Wn, the faster the car 1 can be operated. However, as the power threshold Wn is increased, the deceleration cannot be increased and the deceleration rounding time must be increased. For this reason, there is a trade-off relationship between the power threshold value Wn and the deceleration and deceleration rounding patterns for shortening the operation time. Therefore, it is preferable to set the power threshold Wn and the deceleration and deceleration rounding pattern so that the traveling time is as short as possible.

Embodiment 9 FIG.
Next, a ninth embodiment of the present invention will be described. In the ninth embodiment, the amount of heat generated by the regenerative resistor 12, that is, the temperature, is monitored as the load of the device of the driving unit 16.
FIG. 17 is a block diagram showing an elevator apparatus according to Embodiment 9 of the present invention. In the figure, the heat generation amount calculation unit 134 includes a primary filter 34a, a multiplier 34c, and an integrator 34e. The integrator 34e calculates an estimated value of the heat generation amount of the regenerative resistor 12 from a value obtained by time integration (integration) of the power consumption obtained by the multiplier 34c.

  A calorific value threshold (temperature threshold) can be set in the reference device 35c. The comparator 35a compares the heat generation amount estimated value obtained by the integrator 34e with a heat generation amount threshold set in advance in the reference unit 35c. When the heat generation amount estimated value reaches the heat generation amount threshold, the command change signal is sent to the speed change unit. Input to the command generator 18. The heat generation amount threshold is set based on an allowable temperature at which the regenerative resistor 12 does not become overloaded. Other configurations are the same as those in the eighth embodiment.

  In such an elevator apparatus, while the car 1 is traveling, the amount of heat generated by the regenerative resistor 12 is monitored, and a control command relating to the traveling speed of the car 1 is generated and output to the motor drive unit 15 according to the amount of heat generated. The car 1 can be operated with higher efficiency while preventing the driving device from being overloaded.

Embodiment 10 FIG.
Next, an embodiment 10 of the invention will be described. In the tenth embodiment, the amount of heat generated by the regenerative resistor 12 is monitored as the load of the device of the driving means 16 as in the ninth embodiment. However, in the tenth embodiment, the heat generation amount threshold value is changed according to the power consumption of the regenerative resistor 12.

  FIG. 18 is a block diagram showing an elevator apparatus according to Embodiment 10 of the present invention. In the figure, the comparison unit 135 includes a comparator 35a and a variable reference unit 135c. The variable reference unit 135c obtains the power consumption per predetermined time of the regenerative resistor 12 based on the information from the multiplier 34c, and changes the heat generation amount threshold according to the result.

  FIG. 19 is a graph showing an example of a method for setting a heat generation amount threshold value in the variable reference device 135c of FIG. As shown in FIG. 19, the heat generation amount threshold value is lowered when the power consumption per predetermined time of the regenerative resistor 12 increases. Other configurations and control methods are the same as those in the ninth embodiment.

  In such an elevator apparatus, since the heat generation amount threshold value varies according to the power consumption per predetermined time of the regenerative resistor 12, the heat generation amount threshold value is appropriately changed according to the operation frequency of the car 1, and the regenerative resistor 12 is excessive. It can prevent more reliably that it becomes load. For example, when the operation frequency of the car 1 is increased, the power consumption per predetermined time of the regenerative resistor 12 is increased, so that the heat generation amount is rapidly increased. In contrast, by reducing the heat generation amount threshold to some extent, it is possible to prevent the regenerative resistor 12 from being overloaded due to a delay in control.

Note that the amount of heat generated by the regenerative resistor 12 may be estimated based on the average power consumption. The average power consumption can be obtained as a value obtained by multiplying the output of the primary filter 34a by Von ² / R by selecting the time constant of the primary filter 34a substantially the same as the thermal time constant of the regenerative resistor 12.

Embodiment 11 FIG.
Next, an eleventh embodiment of the present invention will be described. In the eleventh embodiment, the motor voltage and the motor current are monitored as the load of the device of the driving means 16.
FIG. 20 is a graph showing a method of controlling the car speed in the elevator apparatus according to Embodiment 11 of the present invention, and shows an example in which field weakening control of the motor 4 is performed. The overall apparatus configuration is the same as that of the fifth embodiment (FIG. 11).

  Here, the field weakening control is a control method of the motor 4 that rotates at a high speed while suppressing a rise in the motor voltage by flowing a negative d-axis current. When the field weakening control is performed and the car 1 is accelerated after the start of running and the motor voltage rises, the field weakening control is performed and the d-axis current starts to flow so that the voltage does not exceed the threshold value A3. In this example, the motor voltage is fixed at the threshold value A3 at time t5. That is, at time t5, field weakening control is started so that d-axis current does not flow more than necessary.

  Although the motor voltage value is suppressed to the threshold value A3 or less by the field weakening control, the d-axis current for suppressing the increase in voltage also increases as the speed increases, so the motor current increases. At this time, in the eleventh embodiment, the motor current is also monitored, and when the motor current value exceeds the threshold value A4, it is determined that the speed limit is a limit speed at which field-weakening control is possible, and the speed command is a speed command value for constant speed travel. It is transferred to.

  The threshold A4 is set based on the allowable current B4 of the motor 4 or the inverter 9. In addition, the motor current temporarily increases from the acceleration rounding start time t6 to the constant speed. In this case, the threshold A4 is set so that the motor current does not exceed the allowable value B4.

As described above, it is possible to prevent deterioration in riding comfort due to deterioration in speed control of the motor 4 due to insufficient output voltage of the inverter 9, electromagnetic noise, and the like, and it is possible to prevent overload due to overcurrent of the motor 4 and the inverter 9.
In addition, the speed can be increased within a range where the driving device is not overloaded, and the operation efficiency is improved.

  In the eleventh embodiment, the case where the motor current value exceeds the threshold value A4 after the motor voltage value becomes constant by the field weakening control is shown. However, when the field weakening control is not performed, the motor current value is set to the threshold value A4. If the motor voltage value exceeds the threshold value A3 before exceeding, the vehicle is switched to constant speed travel at that time.

In the eleventh embodiment, even when the voltage that can be output from the inverter 9 fluctuates, such as when the power supply voltage decreases, the speed command value is appropriately set within the range that the inverter 9 can output according to the fluctuation in the power supply voltage. High speed can be achieved.

Claims (16)

A drive means having a drive sheave, a motor that rotates the drive sheave, and a motor drive unit that drives the motor;
Suspension means wound around the drive sheave,
A car and a counterweight suspended by the suspension means and moved up and down by the drive means; and a control means for controlling the motor drive unit,
The control means monitors the load of at least one device in the drive means during traveling of the car, and instantly generates a control command relating to the traveling speed of the car according to the state of the load. An elevator device that outputs to a motor drive unit, but increases the speed of the car to an upper limit value defined at the start of travel and shifts to constant speed travel at the upper limit value if the load does not reach a preset threshold value. . Said control means, after running start of the car is raised continuously running speed of the car, the load elevator apparatus according to claim 1, wherein reducing the acceleration of the car reaches the said threshold.   The elevator apparatus according to claim 2, wherein the control means increases the acceleration until the acceleration of the car reaches a predetermined acceleration after the start of traveling of the car. The control means, when the load reaches the threshold value during the acceleration running of the car, the elevator apparatus according to claim 1, wherein generating the control command so as to travel the car at a constant speed. The control means, when the load reaches the threshold value during the acceleration running of the car, the elevator apparatus according to claim 1, wherein generating the control command so that the load is kept at the threshold.   The elevator apparatus according to claim 1, wherein the control means monitors at least one of current, voltage and temperature of the motor as the load. The motor drive unit has an inverter,
2. The elevator apparatus according to claim 1, wherein the control means monitors at least one of current, temperature, switching duty and voltage of the inverter as the load.   The control means converts a current supplied to the motor into a d-axis current and a q-axis current in an orthogonal coordinate system, and monitors at least one of the d-axis current and the q-axis current as the load. The elevator apparatus according to claim 1. The motor drive unit has an inverter,
The control means generates a d-axis current command and a q-axis current command in an orthogonal coordinate system to control the inverter, and at least one of the d-axis current command and the q-axis current command as the load. The elevator apparatus according to claim 1, wherein one of the two is monitored. The motor drive unit has an inverter,
The elevator apparatus according to claim 1, wherein the control means monitors the power supplied from the inverter to the motor as the load. The motor drive unit has a regenerative resistor,
The elevator apparatus according to claim 1, wherein the control means monitors the temperature of the regenerative resistor as the load. The motor drive unit has a regenerative resistor,
The elevator apparatus according to claim 1, wherein the control means monitors regenerative power generated by the regenerative resistor as the load. The motor drive unit includes an inverter and a breaker connected between the inverter and a power source,
The elevator apparatus according to claim 1, wherein the control means monitors the current flowing through the circuit breaker as the load. The motor drive unit includes an inverter and a converter connected between the inverter and a power source,
The elevator apparatus according to claim 1, wherein the control means monitors a DC voltage input from the converter to the inverter. The motor drive unit has an inverter,
The control means includes a current control unit that generates a current command for controlling the inverter, and indirectly compares the load by comparing a current supplied from the inverter to the motor and the current command. The elevator apparatus according to claim 1 to be monitored. The driving means is provided with a speed detector for detecting the rotational speed of the motor,
The control means includes a speed command generation unit that generates a speed command that is the control command related to the rotation speed of the motor, and compares the speed detected by the speed detector with the speed command. The elevator apparatus of Claim 1 which monitors indirectly.

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