Through simulating the armature current the running performance of the motor(RSM160L-6)designed is analyzed. The test is made proving that the REPMSM is 6.1% higher in efficiency and 18.7% higher in power factor than the homomorphous asynchronous motor.

With tracking armature current, compensation windings are fed with the current whose amplitude and phase can be adjusted to counteract the armature reaction, by the control of converter.

The Fuzzy-PID control way was used to control position of DC torque motor, and the fuzzy control way was utilized to restrict the armature current of DC torque motor.

And commutation position of inverter must be adjusted according to the value of armature current. It's beneficial for the motor to provide most torque and less torque ripple.

Finally, the work principle of PWM power amplifier and the magnitude of armature current are analyzed. The slight vibration prosperity of motor in DC PWM servo system, and the effect of dead-zone of PWM control signal on the low velocity properties are discussed.

This paper describes a current method of permanent magnet synchronous motors (PM motors) for high torque operation. In this control method , by controlling the current phase angle actively,the reluctance torque is used to produce the maximum torque per armature current.

On the basic of fundamental the dynamic model is realized. The voltage of armature, current,thrust and speed is analysed when it is starting. Also this motor is simulated by MATLAB and tested by the computer which is used to test permanent magnet linear synchronous motor.

Through simulating the armature current the running performance of the motor(RSM160L-6)designed is analyzed. The test is made proving that the REPMSM is 6.1% higher in efficiency and 18.7% higher in power factor than the homomorphous asynchronous motor.

In this paper, the blooming-mill main drive system excited by SCR hasbeen studied by theoretical analysis in combination with analog computersimulation. Emphasis is placed on the discussion on the relationship betweenthe static position error of armature current and the system parameters, whenthe electronic optimal principle is used to synthesize the armature currentloop and motor back electromotive force (emf) disturbance is neglected, and theaction on the system behaviour. The author's considerations...

In this paper, the blooming-mill main drive system excited by SCR hasbeen studied by theoretical analysis in combination with analog computersimulation. Emphasis is placed on the discussion on the relationship betweenthe static position error of armature current and the system parameters, whenthe electronic optimal principle is used to synthesize the armature currentloop and motor back electromotive force (emf) disturbance is neglected, and theaction on the system behaviour. The author's considerations have been givento the synthesis and regulation of the system. The results in the paper arein accord with the actual regulating ones obtained.

Influences of armature current due to counter emf of D. C. drivers of controlled silicon rectifer are stated. This paper describes the deviations of magnitude-frequency and phase-fre- quency characteristics under the operating conditions of: (1) neglecting the influence of armature current due to counter emf; (2) different electro-mag- netic time-constant Ta, (3) different mechanical-electrical time-constant Tm and (4) different cut-off frequency ω. This paper also suggests second-order optimal...

Influences of armature current due to counter emf of D. C. drivers of controlled silicon rectifer are stated. This paper describes the deviations of magnitude-frequency and phase-fre- quency characteristics under the operating conditions of: (1) neglecting the influence of armature current due to counter emf; (2) different electro-mag- netic time-constant Ta, (3) different mechanical-electrical time-constant Tm and (4) different cut-off frequency ω. This paper also suggests second-order optimal parameter-correcting method as counter emf being considered.

A digital generator protection against the internal asymmetrical faults is discribed in this paper. The protection follows the principle of fault component. Its high sensitivity and reliability are completely not limited by external asymmetrical sources and the frequency change in the power system.In the event of any asymmetry in the armature current of a synchronous generator, a negative sequence component of current induces a second harmonic current in the field winding. On the other hand,...

A digital generator protection against the internal asymmetrical faults is discribed in this paper. The protection follows the principle of fault component. Its high sensitivity and reliability are completely not limited by external asymmetrical sources and the frequency change in the power system.In the event of any asymmetry in the armature current of a synchronous generator, a negative sequence component of current induces a second harmonic current in the field winding. On the other hand, the negative sequence power produced by an internal asymmetrical fault will flow in the opposite direction with that produced by an external fault. According to this fact, a scheme for generator protection based on the transistor has been proposed [2] and is applied in large generators in China.A similar study based on a minicomputer has been developed [3]. But these schemes have some disadvantages: (1) A normal negative current provided by asymmetrical load in the power system will reduces the sensitivity of the protection. (2) 3-phase short circuit at the generator terminal will lead to wrong operation of negative power unit. In addition, it is possible that an error tripping is caused by the frequency change which appears when the generator starts and a serious external fault happens.In new principle, the fault component of a second harmonic component and negative sequence power are used as a basis ot measurenent. New criterious (eqs. (1)-(5)) proposed here make the protection to have higher sensitivity and not to lost even in starting process of the generator. In this paper high speed sequence filter (eq.(7)) and a method of automatically tracking The basic frequency are proposed by means of digital technique. To remove the error caused by DC decaying component to Fourier algorithm, a error function of decaying time constant T is derivated (eqs.(9), (10)) to determine the error form and error level. As s result, a naw correcting method has been found.The experiental device based on a 16 bit mitrocomputer has been set up and tests have been conducted on a dynamic simulating synchronous generator for various types of the internal and external faults. Resulte show that the device can operate correctly under fault conditions of two phase short circuit,turn to turn short circuit and broken winding within the stator of the generator.