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- Thepthida Arrak 1
- Thipjak Nualboonrueng 1
- This independent study had the objectives to study general data of brand equity of Ford automobiles by utilizing questionnaires as the tools in data collection. The sample group was consumers using Ford, total 400 samples. Statistics used in data analysis were descriptive statistics, frequency, percentage, mean and standard deviation. The Independent Samples t-test was used to test the difference between two independent groups whereas One-way ANOVA (F-test) was used to determine whether there were any significant differences between the means of the three or more independent groups. Besides, Least Significant Difference (LSD) was also used to determine the minimum difference between any two means. From the study result, it found that most respondents were male, (60%), aged between 31-40 years (43%), had Bachelor’s Degree (67.5%), had occupation as private company employees (43%), had monthly income between 28,001-38,000 Baht (46.5%), were married for 53%, and type of automobile that they used was pickup truck. Moreover, from the testing results, it found that the different age, education level and income, had different recognition in brand equity at a significance level of 0.05. 1
- This thesis presents a construction of a three phase linear induction motor together with its drive control. The drive control of such motor is analyzed and then also built. The direct torque control in this thesis generate a voltage and reference frequency by using a motor torque and its magnetic flux error in order to control such linear motor. However the space vector modulation method are utilized in this work instead of using a stator flux and look-up table technique. A 1kW, 16 pole of three phase single-sided linear induction motor is constructed and built in this work. The motor drive is also built within a 10 kHz switching frequency. However the controller is composed of by using a TMS320F240 DSP board in order to generate a control signal for a inverter circuit, and using a DSPACE 1104 real time interfacing card in order to implement for a direct torque control method. Simulations results of the three phase linear induction motor was done by using MATLAB/SIMULINK and experimental results of such linear induction motor was also analyzed in this work. It shows that the proposed system provides a fast response of torque control comparing with a traditional V/F control. In practice, a transition time of motor torque is about 50 ms, while such controller of the linear induction motor has a command torque at 5 Nm. 1
- Thong Lantharthong 1
- Thongkam Chumpol 1
- Thongpin, Chanchai 1
- Thosporn Sangsawang 1
- Tien-Rein Lee 1
- Ting Zeng 1
- Tong Wu 1
- Tonwitowat, R 1
- Toshihiko Harada 1
- Tsugawa, T. 1
- U. Insuan 1
- U. Sanguanpong 2
- Unchaleeporn Sribounoy 1
- Uraiwan Inyaem 1
- V. Pirajnanchai 2
- V.M. Salokhe 1