1. A mobile vehicle, comprising:a car body having two wheels on two laterals of each of a front side and a rear side thereof, and a chassis bracket at a bottom thereof;
a gasoline engine in the car body;
an electricity generator connected to the gasoline engine in the car body;
a power and motor controller connected to the electricity generator in the car body and having at least one signal cable;
at least one capacitive battery connected to the power and motor controller in the car body and having at least one power cable;
a drive motor disposed on a front side or a rear side of the chassis bracket and connected to the at least one capacitive battery by the at least one power cable and to the power and motor controller by the at least one signal cable, wherein the drive motor has a motor body disposed along an X-axis on the chassis bracket, a stator unit accommodated in the motor body, a rotor unit corresponding to the stator unit, and a rotational shaft passing through a center of the motor body along a Y-axis for assembling to the rotor unit for fixation, and wherein a volume of the motor body, the stator unit and the rotor unit can be simultaneously amplified toward one or more of the X-axis, the Y-axis, and a Z-axis, the motor body of the drive motor including a casing base having a chamber at a first end thereof, a first assembling part at a bottom center of the chamber and having a shaft hole at a center thereof, a first assembling slot corresponding to the first assembling part at a second end thereof and having a stop flange at an opening thereof, at least one bearing accommodated in the first assembling slot, a retaining ring in the first assembling slot for screwing to the stop flange by plural fasteners and sealing the opening of the first assembling slot to position the at least one bearing in the first assembling slot, a fixing flange formed on an outer wall thereof and having plural lock holes for the plural fasteners to be inserted and fixed to the chassis bracket, a cable outlet hole on a lateral wall of the chamber, and a fixing ring at a bottom of the chamber; and a shell cover for correspondingly covering on an opening of the chamber of the casing base and having a second assembling part at a center at a first end thereof, a second assembling slot at a second end thereof and corresponding to the second assembling part, a bearing disposed in the second assembling slot, and a buckle ring disposed at an opening of the second assembling slot to position the bearing in the second assembling slot; wherein the stator unit further comprises a stator ring made of a long steel strip that is wound and tightly fixed into a ring body to be accommodated in the chamber and having a first end and a second end fixed to the fixing ring, a through hole at a center of the stator ring, plural coil holes arranged at intervals on an inner wall of the stator ring, plural ditches at the first end of the stator ring for correspondingly communicating with the plural coil holes, and plural coils for respectively winding between the two adjacent coil holes and connected in series by the two adjacent coils thereof for passing through the cable outlet hole to connect the at least one power cable of the at least one capacitive battery and connect the at least one signal cable of the power and motor controller; the rotor unit further comprising a rotor base accommodated in the chamber of the casing base and having a first end and a second end corresponding to the stator ring, a shaft sleeve at a center of the rotor base, a shaft hole at a center of the shaft sleeve, a first positioning part on a wall of the shaft hole, plural fixing slots around the shaft sleeve at the second end of the rotor base, and plural permanent magnetic sheets respectively and correspondingly connected to the plural fixing slots for further corresponding to the plural coils on the stator ring; and wherein the rotational shaft is inserted into the shaft hole on the rotor base and further provided with a first end protruded from the first end of the rotor base and passing through the buckle ring in the second assembling slot for connecting the bearing in the second assembling slot and locking the shell cover to the casing base by the plural fasteners, a second end passing through the second end of the rotor base, the through hole on the stator ring, the shaft hole of the first assembling part, the at least one bearing and the retaining ring and protruded from the second end of the casing base, a second positioning part corresponding to the first positioning part, a fixing element for connecting the second positioning part to the first positioning part and fixing the rotational shaft to the rotor base, and a positioning ring contacting the at least one bearing in the first assembling slot through the shaft hole of the first assembling part of the casing base for positioning; and
a transmission connected to one end of the rotational shaft protruded from the motor body and having a differential disposed on the front side or the rear side of the car body and connected to the two wheels on the two laterals of each of the front side and the rear side of the car body.