Motor Circuit DiagramsOscillators Circuit Diagrams

PWM governor

The governor described in this article is intended primarily for small 12 V motors that draw a current of not more than 2 A. Many governors limit the current through the motor, which also reduces the torque. Since it is controlled by pulse-width modulation (PWM), the present governor preserves most of the torque. The control is based on a sextuple CMOS inverter, IC1 (Type 40106). Three motors are driven via a discrete Darlington, T1-T2.

Inverter IC1a function as an oscillator, whose on time (time T2 conducts so that the motor is provided with power) is determined by R2-C9-D3. The off time of the oscillator (when T2 is also off) is determined by R3-P1-C2-D4, and may thus be varied with P1.

Parallel-connected inverters IC1b and IC1c, form a buffer between the oscillator and the power Darlington.

The motor is connected to the + and 0 terminals in the diagram.

Power for the governor and the motor is provided by a mains transformer, whose secondary voltage is single-phase rectified by D1 and D2).

An indicator LED with current limiting resistors is connected to the motor terminals.

Network R1-C1 smooths the supply voltage to IC1.

Finally, T2 must be fitted with a suitable heat sink.

PWM governor Schematic diagram

PWM governor Schematic diagram


Mini DC Motor PWM Governor Speed Controller Switch Regulator adopts the latest low voltage drive technology, the current is up to 5A, the smallest volume is only 1 yuan coin size, the applicable voltage is the widest 3-35V, and it is equipped with a self-recovery fuse, pocket DC governor, Also suitable for LED dimming.

At higher PWM frequencies, the pulses from the motor controller board change too quickly to provide enough energy to spin the motor until the equivalent voltage reaches 2.0 volts, although switching to using slow decay mode can help.
  • The DC motor controller input is only connected to DC power.
  • Built to meet standard specifications, strictly follow factory quality control.
  • Designed with a digital display panel, easy to read and convenient to set up.
  • Superior PWM governor, support soft start and soft stop can reduce the mechanical stress on the motor and shaft.
  • Compact size, low power consumption, quick response, dependable to use.

Related Articles

Leave a Reply

Your email address will not be published.

Back to top button