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Composite control apparatus of electric motor

A technology of comprehensive control and single-chip control, applied in the direction of single motor speed/torque control, emergency protection circuit devices, electrical components, etc., can solve the problems of poor measurement linearity and low measurement sensitivity.

Inactive Publication Date: 2008-12-10
夏大洪
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AI Technical Summary

Problems solved by technology

For current sensors with ferromagnetic materials, when the measurement current is small, the hysteresis phenomenon will make the measurement sensitivity low. When the measurement current is large, the saturation of the magnetic circuit will make the measurement linearity worse, which is very demanding for measurement links (such as: power metering) is not feasible, it is necessary to install a dedicated current sensor

Method used

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  • Composite control apparatus of electric motor
  • Composite control apparatus of electric motor
  • Composite control apparatus of electric motor

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specific Embodiment

[0012] Specific embodiments: a motor comprehensive control device realizes several functions of motor protection, metering, energy saving and control through a linear measurement circuit. The linear measurement circuit includes three parallel fixed copper bars, and linear Hall elements with relatively fixed positions are respectively arranged near the three fixed copper bars. Vertical, but parallel to the direction of the magnetic field formed by the current in the adjacent copper row. It also realizes motor protection, motor winding switching, reactive power dynamic compensation, soft start, control of frequency converter speed regulation and power consumption measurement through single-chip microcomputer control.

[0013] In the figure, 1 is the fixed copper bar, 2 is the secondary terminal of the device, 3 is the device chassis, 4 is the insulating circuit board, 5 is the linear Hall element, 6 is the copper fixing screw, 7 is the voltage sensing circuit, and 8 is the curre...

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Abstract

The invention relates to a motor protection and control apparatus, providing a motor combination control apparatus for simplifying the small wiring of a multifunction motor protection control system and the reasonable match between each control function, which realizes the functions of the protection, the computation, the energy saving and control of the motor through the linear measurement. The linear measuring circuit includes three fixed copper bars in parallel, and a linear hall element in fixed position relatively is arranged on three fixed copper bars. The measuring plane of the hall element is vertical to the direction of the magnetic field of the current in the measured copper bar. The invention also includes an apparatus small wiring terminal 2, an apparatus case 3. The motor combination control apparatus solves the problems that the resources between each separating device are not shared, the matching is difficult and the wiring is complex.

Description

Technical field: [0001] The invention relates to a motor protection and control device, which realizes the measurement of motor voltage and current through a built-in sensor and a single-chip microcomputer circuit. Background technique: [0002] The electric motor is an important load of the electric system. In the oilfield mining area, only the motor of the water injection pump and the electric motor of the pumping unit account for more than 60% of the total power consumption of the oilfield production. In order to reduce the electric energy loss of the motor, people adopt various energy-saving control measures, among which the common energy-saving control measures are: monitoring the power consumption of the motor through the electric energy meter, installing a capacitor to compensate the reactive power of the motor, and using a dual-power motor to track the load For some specific motor-driven loads, it is often necessary to perform intermittent operation control, step-dow...

Claims

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Application Information

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IPC IPC(8): H02P6/08H02H7/08
Inventor 夏大洪
Owner 夏大洪
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