Unlock instant, AI-driven research and patent intelligence for your innovation.

Safety speed monitoring system for three-phase AC transmission without sensor

A three-phase AC, rotational speed technology, applied in the direction of motor speed or torque control, control system, vector control system, etc., can solve problems such as unknown solutions, failure accuracy or dynamic indicators, and reduce technical costs. , Safety improvement, the effect of simple error detection device

Inactive Publication Date: 2005-12-07
SIEMENS AG
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] All so far implemented solutions for this function fail in the accuracy or dynamics of the detected (or calculated from current and voltage) rotational speed
And as yet no satisfactory solution is known for restoring the stator frequency by the transistor control signal controlling the inverter

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Safety speed monitoring system for three-phase AC transmission without sensor
  • Safety speed monitoring system for three-phase AC transmission without sensor
  • Safety speed monitoring system for three-phase AC transmission without sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0050] figure 1 The diagram in the diagram shows a possible technical implementation of the "safe speed" function with the aid of a circuit block diagram of a transmission system with asynchronous motor transmission control. The transmission system is composed of a three-phase AC motor M powered by an inverter W, which has IGBT transistors T1 to T6 as rectifying elements arranged in a bridge circuit. Each transistor T1 to T6 is equipped with free-running diodes D1 to D6 and is controlled by the corresponding control electrode signals G1 to G6 of the transmission control unit A.

[0051] The transmission system is provided with two systems S1 and S2, which operate the inverter W and the three-phase AC motor M. Each system is equipped with an intelligent device, such as a microprocessor, a device in the form of a microcontroller, or a corresponding application spe...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention makes possible a safety function for speed monitoring in the case of all induction machines operated on an inverter without a sensor system, in that a determined setpoint stator frequency value (*S) is limited and monitored in a two-channel mode in two systems with approximate redundancy, deriving from this in each system respective sets of control signals for the electrical valves of the inverter, which can be compared with one another in two systems of monitoring electronics. In the event of fault detection, two-channel switching off takes place. The circuit arrangement according to the invention can additionally be subjected to enforced dynamization.

Description

Technical field [0001] The invention relates to a transmission control for detecting the state / position and rotation speed of a three-phase AC motor when there is no combined sensor system through an inverter, especially an inverter of a rectifier bridge circuit. [0002] In industrial automation technology-such as CNC machine tools and robot electric transmission applications, we strive to protect humans and machines as strong as possible. With the help of a "safe speed" function for the motor, it will be ensured that the motor or the motor can still be controlled in the case of a single error, so that it can execute the movement that is as safe as possible. [0003] The corresponding safety functions have been mainly used in the machine tool field so far. In this regard, the basis of the safety function is usually the sensor system combined in the motor for state / position and speed detection. For other fields, such as production machines, this safety function is also becoming mo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08H02P21/12
CPCH02P21/12H02H7/0844
Inventor 冈特·施韦西格
Owner SIEMENS AG