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PWM Governor Schematic Circuit Diagram

Efficient Governor Design for Small 12V Motors

The governor detailed in this article is primarily designed for small 12V motors with a current draw not exceeding 2A. Many existing governors restrict the motor’s current, leading to a reduction in torque. However, this governor, controlled via pulse-width modulation (PWM), retains most of the torque. The control mechanism relies on a sextuple CMOS inverter, IC1 (Type 40106), and drives three motors through a discrete Darlington pair, T1-T2.

Oscillation Control with Inverter IC1a and Timing Elements

Inverter IC1a operates as an oscillator, determining the on-time (when T2 conducts and provides power to the motor) through R2-C9-D3. The off-time of the oscillator (when T2 is off) is regulated by R3-P1-C2-D4 and can be adjusted using P1. In parallel, inverters IC1b and IC1c act as buffers between the oscillator and the power Darlington. The motor connects to the + and 0 terminals in the diagram. Power for both the governor and the motor is sourced from a mains transformer, with its secondary voltage single-phase rectified by D1 and D2. An indicator LED, along with current-limiting resistors, is linked to the motor terminals. Network R1-C1 ensures a stable supply voltage for IC1. Additionally, it’s crucial to attach a suitable heat sink to T2 to manage heat dissipation effectively.

PWM governor Schematic diagram

PWM governor Schematic diagram

Cutting-Edge Mini DC Motor PWM Speed Controller

The Mini DC Motor PWM Governor Speed Controller Switch Regulator integrates the latest low-voltage drive technology, boasting a remarkable current capacity of up to 5A. Despite its compact form, it’s no larger than a one-yuan coin. This versatile regulator accommodates a wide voltage range, spanning from 3V to 35V, and features a self-recovery fuse. Whether for pocket-sized DC control or LED dimming applications, it proves to be an ideal choice.

Addressing High PWM Frequencies for Motor Control

At elevated PWM frequencies, the motor controller board’s pulses change rapidly, making it challenging to provide sufficient energy to initiate motor rotation until the equivalent voltage reaches 2.0 volts. However, adopting the slow decay mode can alleviate this issue and facilitate effective motor operation.

  • 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, it is easy to read and convenient to set up.
  • Superior PWM governor, soft start, and soft stop can reduce the mechanical stress on the motor and shaft.
  • Compact size, low power consumption, quick response, dependable use

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