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Method of controlling electric motor, system for controlling electric motor and electric motor

A technology of electric motors and microcontrollers, applied in electric motor control, electronic commutation motor control, control systems, etc., can solve the problems of increasing final cost and a large number of hardware

Inactive Publication Date: 2010-05-12
EMPRESA BRASILEIRA DE COMPRESSORES SA (EMBRACO)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coupled sensors have the disadvantage of adding an extra component to the motor design, greatly increasing the final cost
One of the downsides is that it requires a lot of hardware

Method used

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  • Method of controlling electric motor, system for controlling electric motor and electric motor
  • Method of controlling electric motor, system for controlling electric motor and electric motor
  • Method of controlling electric motor, system for controlling electric motor and electric motor

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Embodiment Construction

[0039] Figure 1 (a) shows the basic configuration of the converter and (b) the ideal waveform existing in the trapezoidal wave when driving a brushless DC permanent magnet three-phase 4-pole motor. In normal operation, the controller analyzes the voltage and / or current According to the input of the observer, the switch SW is activated in the sequence shown in Figure 1 according to the detected position 1 ,...SW 1 . If an over-current situation occurs according to the instructions of the current observer, all the switches are turned off to protect the system.

[0040] reference Figure 7 , The control system of the present invention is completely implemented by the microcontroller 10 and an A / D converter equipped with at least 3 input terminals, wherein the at least 3 input terminals are used to read the voltage (F N ) Corresponding voltmeter (D n ) In the voltage (f N ). Obviously, the microcontroller 10 can be replaced by an equivalent device that has the same characteristics as...

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PUM

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Abstract

A system of controlling an electric motor, a digital method of controlling an electric motor and an electric motor are described. The system of controlling an electric motor of N phases comprises a microcontroller (10), an A / C converter (30) associated to the microcontroller (30), a set of voltage meters (DN) associated to the A / D converter (30), a set of switches (SW2N) connected to an electric voltage (VBARR) and associated to the microcontroller (30), the microcontroller (30) selectively feeding, by means of at least two switches (SW2N) two phases (FN) of the motor (20) with the voltage (VBARR) during a period of time (TPOS), the movement of the motor inducing the electric voltages (EN), the set of meters (DN) measuring the signals of electric voltages (fN) and comparing these voltageswith each other to determine the period of time (TPOS). One describes also the calculation of a parameter, called H (r), used to adjust the instants of commutation according to the constructive type of the motor. The parameter depends upon the rotation of the motor. One also foresees the use of a digital filtering technique, to eliminate the effects of the modulation on the control method. The filtering is characterized by the arithmetic mean of the last k samples of each average electric voltage (fN), these samples being synchronized with the period of modulation.

Description

Technical field [0001] The invention relates to a system for controlling a motor using a digital control method of the motor, and in particular to a brushless DC permanent magnet motor and a motor equipped with a digital control system. Background technique [0002] The brushless DC permanent magnet motor can be driven without any information related to its position, so it works like an induction motor. However, in order to obtain the maximum torque and efficiency, the phase current must be synchronized with the induced voltage. This can be achieved by physically coupling the sensor to the motor, such as a Hall type, optical sensor, etc., or can be achieved by observing the induced voltage and / or current. The coupled sensor has the following shortcomings: additional components are added to the motor design, which greatly increases the final cost. In addition, space constraints and the environment in which the motor is located may make the use of such sensors unfeasible. Theref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/18H02P6/14H02P6/16
CPCH02P6/18H02P6/165H02P2209/07H02P6/142H02P6/15H02P6/17
Inventor M·G·施瓦茨R·安德里希
Owner EMPRESA BRASILEIRA DE COMPRESSORES SA (EMBRACO)