Mongkol Konghirun

An Improved Sliding Mode Observer for Speed Sensorless Vector Control Drive of PMSM

This paper proposes a speed sensorless control scheme for permanent magnet synchronous motor (PMSM) drive using an improved sliding mode observer (SMO). A variable frequency or cutoff frequency in low pass filter is not essential to use in the improved SMO. Since the product of the improved SMO gain and the control action of sigmoid function, which replaces the Bang-Bang control or discontinuous control, commonly found in the conventional SMO, can determine the equivalent back emfs. The estimated rotor position and speed are obtained directly from them. Therefore, the low pass filter can be eliminated and the improved SMO could simplify the conventional SMO. Also, the cutoff frequency tuning is not necessary. A DSP based digital controller using the TMS320F2812 from the Texas Instruments has been employed to realize the proposed sensorless control scheme. Experimental results show that the proposed control scheme can achieve robust sensorless requirement

Development of energy management and warning system for resident: An energy saving solution

This paper is proposing the household energy management and warning system for energy saving solution. The overall control scheme is mainly governed by a dsPIC33 microcontroller. There are four subsystems to be concerned (i) air-conditions inverter control, (ii) fluorescence brightness control, (iii) power switching control (for general loads such as television, radio, fan, etc.), (iv) household electricity usage warning system. This whole system can monitor the power usage and display through a LCD monitor. Then, it can warn the users through LED bulbs when the power usage is getting close to the monthly prescribed energy usage levels. An experiment conducted by installing this system in an apartment room has shown a satisfactory result in reducing power usage level.

A resolver-based vector control drive of permanent magnet synchronous motor on a fixed-point digital signal processor

Resolver, an absolute position sensor, is commonly used in the severe environment because of its robust structure of rotating transformer. In this paper, a resolver algorithm mainly developed in the controller is proposed. The rotor speed and position are calculated from the sine and cosine resolver signals. The vector controlled drive of permanent magnet synchronous motor (PMSM) using resolver is focused. The experiments will be carried out to substantiate the proposed technique in the speed controlled drive system of PMSM. The algorithms are practically implemented in a fixed-point digital signal processor based controller (TMS320F2812 eZdsp board).

A Fast Transient-Current Control Strategy in Sensorless Vector-Controlled Permanent Magnet Synchronous Motor

This letter presents a current control technique for fast transient-current response in a sensorless vector-controlled permanent magnet synchronous motor. Pontryagins maximum principle is employed to derive the time-optimal voltage solution. Based on this principle, the technique can guarantee the current vector transition from one operating point to another with minimum time. Compared to a proportional-integral controller, the current response by using the time-optimal controller is much faster, even under a limited dc bus voltage. Experiments are carried out to substantiate the proposed technique

A DSP - Based Vector Control of PMSM Servo Drive Using Resolver Sensor

This paper presents the implementation of vector control drive of permanent magnet synchronous motor (PMSM) using resolver sensor. The resolver algorithm for calculating the rotor position and speed of PMSM is developed. In this technique, the calculated position is obtained by closed loop operation. The error between the calculated position and the actual one is forced to zero by the PI controller. Rotor position is then computed by integration of the output of PI controller. The calculated rotor position is finally compensated with a proper offset. A DSP based digital controller using the fixed-point TMS320F2812 is employed to verify the proposed resolver algorithm. Experimental results show that the proposed scheme is successful in the speed closed loop vector control drive of PMSM. The rotor positions can be accurately calculated even at zero speed

A Three-Phase Space-Vector Based PWM Rectifier with Power Factor Control

A three-phase space-vector based PWM rectifier with power factor control has been proposed in this paper. The three-phase phase locked loop (PLL) is designed to detect the phase angle of utility voltage, which is used to create three-phase reference currents. The proposed scheme is simple and practical to be implemented on a fixed-point digital signal process based controller. It also does not require any system parameters. According to experimental results, the dc output voltage is successfully controlled while the unity power factor is accomplished.

The Performance Improvement of Constant V/f Control of Induction Motor Drive in Low Speed Range

This paper presents the performance improvement of constant V/f control of induction motor drive. In order to compensate the stator resistance voltage drop at low speeds the steady state equivalent circuit of an induction motor is analyzed to establish the equations of the stator resistance compensation. The magnitude of the stator resistance voltage drop is calculated by vector compensation. This method requires only the stator resistance and the nameplate data of motor. The slip frequency compensation is also proposed to reduce the steady state speed error. The steady state torque equation and a linear torque-speed approximation are simply designed for slip calculation. The simulation and experimental results confirm the effectiveness of the proposed scheme especially in the low speed range

Dual field oriented permanent magnet synchronous motor (PMSM) drive using a single DSP controller

Traditionally high performance drives utilized dedicated controllers to perform complicated mathematical operations. However, several factors are rapidly changing this scenario. The current DSP controllers can now integrate a variety of sophisticated peripherals. This integration of DSP core with a set of useful power electronics peripherals significantly simplifies the drive design and also allows designers to implement high performance drives using a single DSP controller. This paper presents an implementation of a dual permanent magnet synchronous motor drive using a single DSP controller. The drives utilize field oriented control to achieve higher performance. The DSP controller utilizes the on-chip power electronics peripherals to achieve independent control of each drive without adding any off chip components thus bringing significant system design simplification as well as total system cost reduction. This paper presents the complete hardware and software modules needed utilized to implement the dual PMSM drive.

Digital control of sensorless brushless DC motor drive system with power factor correction for air conditioners

Nowadays, the brushless dc (BLDC) motor has been gained more attention in air conditioner applications as the energy efficiency requirement is concerned. The type of motor using as fans or compressor is gradually changed from induction motor to BLDC motor. The main advantages of BLDC motor are high efficiency, compact structure, and high power density, comparing with induction motor. In addition, the power quality of BLDC driver board such as the low line current harmonics and unity power factor (PF) is desired in order to meet the EN 61000–03–2 standard. In this paper, the sensorless drive system of BLDC motor with power factor correction is digitally implemented. Experimental results are presented to validate the successfully implementing system.

Online parameter identification method for IPMSM drive with MTPA

This paper presents the online identification method for interior permanent-magnet synchronous motor (IPMSM) drive system with the maximum torque per ampere (MTPA). The inductances of the motor are identified by recursive least square (RLS) method based on mathematical model, considering the flux saturation state. Using this technique, the improvement of the MTPA trajectory for IPMSM can be implemented along with the effect of magnetic flux. This final paper presents an idea and a procedure of the proposed algorithm. The simulation results are carried out and presented.