In the end, the linear motor is divided into AC and DC, the speed regulation principle uses DC chopper or pwm, and the driving circuit is what?

Of course, there are DC AC points, but the small motor is generally DC, if it is a pure analog control circuit, with DC chopper, if it is a single-chip microcomputer control with PWM is more convenient, the driver can use the motor drive chip, you can also use the transistor to build a bridge drive.

If it is not just two lines, then it must be a stepper motor, with multi-channel PWM control, which requires coordination on the timing, more complex, but more accurate control.