Based on the simulation of the asynchronous motors, waveform of voltage, current, rotate speed, torque and flux were obtained. The torque waveform comparisons among the different torque pulsation schemes were given.
The influence of different stator and rotor structures on the torque of PMDC brushless motor is analyzed by means of ANSYS software, and the strategy of minimizing torque pulsation and increasing output is discussed.
On the basis of this structure and method of control,the 10/8 pole is compared with the 8/10 pole external rotor doubly salient permanent magnet motor in torque ripples,and it's educed that the 8/10 pole motor is propitious to reduce torque ripples.
Through the detailed analysis of the commutation torque ripples and the relationship between the DC current and phase current in the commutation interval, two effective methods are proposed to reduce the commutation torque ripples. The two methods are the negative DC current elimination method and the commutation current prediction control method, respectively.
uses adaptive fuzzy intelligent control strategy to increase the torque density , avoid current peaks , enhance robusticity and adaptive ability of controller by on-line parameter identification and correcting control parameters on time and match proper current loop, so torque-ripple is minished and high performance-control of SRM is got.
Moreover, the hysteresis band current control and the voltage model control techniques are applied respectively to make the actual current track the desired current, as a result that the torque-ripple minimization is ideally achieved.
On the basis of the analysis of SRM torque model, a new control strategy is presented which solves the torque smooth transition in the process of commutation, thus reducing toque-ripple effectively. An online control scheme of the strategy is discussed in detail. The reduction of torque-ripple decreases the noise of motor effectively.
In order to deal with torque pulsation problem caused by traditional control method for brushless DC (BLDC) motor and to achieve high precision and good stability, a novel control strategy is proposed.
Solutions obtained clearly exhibit that the torque pulsation can be effectively reduced by appropriate skew-like shaping of permanent magnets.
To satisfy this requirement, we developed a method for calculating the sound generated when a rotating blade is excited by the torque pulsation of a motor.
As expected, this presents a high value of 6th order harmonic of torque pulsation.
Every time the stator current is commutated from one phase to another, a torque pulsation is generated.
However, a ripple current occurs in the inactive phase due to the diode freewheeling during the non-commutation period in the traditional pulse width modulation (PWM) methods, which aggravates the torque ripples.
A new method for reducing commutation torque ripples in bldc motors
A new compensation method and an algorithm for compensating for the commutation torque ripples of the trapezoidal EMF brushless DC motor are put forward.
Influence of PWM modes on commutation torque ripples in sensorless brushless DC motor control system
Disturbance-observer-based adaptive feedforward cancellation of torque ripples in harmonic drive systems