JPS629242A - Load torque detector - Google Patents

Abstract

PURPOSE:To display the motor torque and the pinion torque continuously without retouching the motor by operating the load torque by various constants of the motor stored in a storage device and the detected values of the voltage and an electric current. CONSTITUTION:A squirrel-cage induction motor 1, an electric wire 2 supplying it with electricity, a voltage detector 3 detecting the voltage of the motor 1 and an electric current detector 4 detecting the electric current are provided to a feeder circuit respectively. Then, the data from the storage device 7 storing the various constants of the motor 1 and the values of the voltage and the electric current from the voltage detector 3 and the electric current detector 4 are inputted to an arithmetic unit 9 by electric wires 8, 5 and 6 respectively. These data are processed based on a prescribed formula and the torque is calculated with the arithmetic unit 9, and the motor and pinion torques are displayed on a display device 11.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a detection device for detecting the load torque of a pinion, etc., and the load torque of an anchor winch, wintruss hoist, etc. in a deck lifting device using a squirrel-cage induction motor as a drive source. Regarding.

[Conventional technology]

Conventionally, in a deck elevating type oil drilling rig, the magnitude of the torque applied to the pinion has been intuitively estimated based on the amount of electrical input from the electric motor connected to the pinion.

Furthermore, when the deck elevating equipment stops raising and lowering and the two oil drilling rigs start operating, it is necessary to detect the torque applied to each pinion in order to equalize the torque applied to multiple pinions. The torque of each pinion was measured individually by detecting shaft twist using a torque wrench.

[Problem that the invention seeks to solve]

However, with conventional load torque detection devices.

It's not just that the value of the torque applied to the pinion of the deck lifting device is unknown, but also voltage fluctuations, activation of the deck lifting device,
In a transient situation during a stop.

It was not possible to detect the torque applied to the pinion.

Furthermore, it takes a long time to measure torque, and
This work was dangerous for humans.

In order to eliminate the above drawbacks, the load torque/rek detection device of the present invention continuously calculates the motor torque and also displays the pinion torque as a converted value.

The purpose is to detect.

[Means for solving problems]

For this reason, the load torque detection device of the present invention is as follows.

A voltage detector and a current detector provided on the power supply circuit of the drive source, a storage device that stores various data of the drive source, and a load torque is calculated based on the data in the storage device and the detected values from both of the detectors. It is characterized by comprising an arithmetic device and a display device that displays the arithmetic results of the arithmetic device.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a load torque detection device according to the present invention.

Figure 1 shows a squirrel-cage induction motor 1 and the electric wires 2 that feed it. Voltage detector 3 that detects the voltage of squirrel cage induction motor 1
．． A current detector 4 for detecting current is provided in each power supply circuit.

Data from a storage device 7 storing various constants of the squirrel cage induction motor l and a voltage detector 8. Current detector 4. The voltage and current values are input to the arithmetic unit 9 through the respective electric wires 8 and 5.6.

The arithmetic unit 9 uses the functions related to the torque, voltage, and current of the squirrel cage motor shown in the following equations (x), (2), and (3), and the function of pinion)/ref to calculate the voltage detector 3.
Current detector 4. and processes the data from the storage device 7 to calculate torque. The value is transmitted to a display device 11 by an electric wire 10, and the motor and pinion torque are displayed.

Calculation formulas (1), (2), and (3) are shown below. The current I in the primary winding of a squirrel-cage induction motor, T, is calculated in v, where:

r++) [+ is the impedance of the primary winding rz+Xz is the impedance of the secondary winding, rlr2 is the normal resistance Hx
l p ”2 is the sum of reactance and capacitance, and S is slip.

V is the terminal voltage of the primary 1st phase ml is the first-order phase number p is the polar logarithm f is frequency) Piniont μ friction Tρ is Tρ=αT...(3) (Here, α is a fixed cooking temperature determined by the mechanical system).

Furthermore, when a large number of the same type of motors are used, such as a coil-shaped induction motor for driving a pinion of a deck elevating device, the device shown in FIG. It is also possible to centralize the display devices of the arithmetic unit 1 in a control channel and display and detect them all at once.

〔Effect of the invention〕

1) Without making any changes to the squirrel cage electric motor.

The motor torque and pinion)/V can be displayed continuously.

2) Torque can be detected regardless of the rotation speed of the electric motor. Torque can be detected even at zero rotation.

It has the following effects.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the load torque detection device according to the present invention. 1: squirrel cage induction motor, 3: voltage detector, 4: current detector, 7: memory device, 9: arithmetic device. 11: Display device

Claims (1)

[Claims] A voltage detector and a current detector provided on the power supply circuit of the drive source, a storage device that stores various data of the drive source, and a load torque is calculated based on the data in the storage device and the detected values from both of the detectors. A load torque detection device comprising a calculation device and a display device that displays calculation results of the calculation device.