Automotive electronic driver features:

 

(1) An application-specific integrated circuit constituting a stepper motor driver system

:

A, pulse distributor integrated circuit: such as Sanyo company‘s PMM8713, PMM8723, PMM8714 and so on.

B, including pulse divider and current chopper controller integrated circuit: such as SGS L297, L6506, etc.

C, only contains power drive (or includes current control, protection circuit) driver integrated circuit: such as Japan new electric power Industrial company MTD1110 (four-phase chopper drive) and

 

MTD2001 (two-phase, H-bridge, chopper drive).

D, the pulse divider, power drive, current control and protection circuit are included in the drive controller integrated circuit, such as Toshiba TB6560AHQ, MOTOROLA

 

SAA1042 (four phases) and ALLEGRO company UCN5804 (four phases) and so on.

(2) Overview of "Segmentation Drive" :

The "motor inherent step Angle" is subdivided into a number of small steps of the drive method, called subdivision drive, subdivision is achieved by the driver precisely control the phase current of the stepper motor, and the motor

 

Body is irrelevant. The principle is that the phase current of the energized stator does not rise to the position at once, and the phase current of the disconnected stator does not drop to 0 at once (the winding current waveform is no longer an approximate square wave, but an N-order approximation

 

Step wave), then the combined magnetic field generated by the stator winding current will cause the rotor to have N new equilibrium positions (forming N step angles).

Main characteristics

 

1 The stepper motor must be driven to run, the drive signal must be a pulse signal, when there is no pulse, the stepper motor is stationary, if the appropriate pulse signal is added, it will be

 

Turn at a certain Angle (called a step Angle). The speed of rotation is proportional to the frequency of the pulse.

The step Angle of the three-phase stepper motor is 7.5 degrees, and a circle of 360 degrees requires 48 pulses to complete.

The 3-step motor has the superior characteristics of instant start and quick stop.

4 Change the pulse order, you can easily change the direction of rotation.

Therefore, at present, printers, plotters, robots, and other equipment are stepper motor as the power core.