Soft Start Of Induction Motor By Acpwm

Model: 361

Solderable DIY project kit for Engineering & Diploma students Worldwide

Do-It-Yourself Kit :

Includes complete hardware comprising of discrete components, modules, PCB, controller etc. and tested program code for building the project. Extensive documentation for project execution including step-by-step instructions for Circuit building, Assembly procedure and Troubleshooting. (Tool kit-Multimeter, Soldering iron and program burner not included in the kit)

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This project attempts a soft start control technique for the single-phase a.c. induction motor. It presents a design of a low-cost; high-efficiency drive capable of supplying a single-phase a.c. induction motor with a PWM modulated sinusoidal voltage during start. The circuit operation is controlled by an 8051 family microcontroller.The device is aimed at substituting the commonly used triac phase angle control drives. The circuit is capable of supplying a single-phase a.c. induction motor (or general a.c. inductive/resistive load) with varying a.c. voltage at the start. Same as in triac control, the voltage applied to the load is varied from zero to maximum value in a small span of time during start. On the other hand, it uses a pulse width modulation technique (PWM), and when compared with the phase angle control used for triacs, it produces much lower high order harmonics. Thus, it suits EMC/EMI regulations much better. Because the circuit is aimed at low-cost, low/medium-power applications, it does not use a conventional converter topology to produce the output voltage waveform. It directly modulates the mains a.c. voltage. Compared with costly converter, it requires a lower number of active and passive power components. In summary, the device attempted here takes advantage of both the low price of the phase angle control and the low harmonic content and high efficiency that we can get with standard converter topology. The drive uses a PWM controlled MOSFET and the load in series with a bridge rectifier. This drive based on this new control technique is targeted for use in consumer and industrial products: washing machine, dishwashers, ventilators, compressors, and wherever the system cost is a consideration.


All-inclusive solution kit.

Extensive audio-visuals available.

Branding-free material.


Call/mail for Tech Support from 10 am – 7 pm.

Can be Customized for Arduino, Raspberry Pi, PIC


Hardware Requirements

  • 8051 series Microcontroller
  • LM358
  • Opto- isolators
  • Voltage Regulator
  • IGBT
  • Diodes
  • Push Button
  • Resistors
  • Capacitors
  • Zener

Software Requirements

  • Keil compiler
  • Language: Embedded C or Assembly

Q & A

Buyer Feedback

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  1. Rated 4 out of 5

    Kevin Merchant

    By browsing i got to know about your website. I got information everything from your website that why i haven’t gone through any other website i purchased directly in future i will give reference. I’ll save your number.

  2. Rated 3 out of 5

    Darshan Janthli

    I come to know Edgefx through and I gone through the website and placed an order. Actually while I was searching for the single phase inverter design, I found this project and I decided to take. I like the concept of the kit.Yes the kit delivered on time with the right components.No I purchased through online.Edgefx should implement complex projects.

  3. Rated 4 out of 5


    Yes the kit delivered on time with the right components.All my technical queries were cleared and your Technical support is Average.I am satisfied while building the project.Yes I recommend about Edgefx in future.

  4. Rated 4 out of 5


    I came to know about Edgefx while browsing another website I seen the advertisement of Edgefx.I decided because what I needed is present in the kit and I like the Report and PPT in my kit.The kit delivered on time with extra set of components. I also suggested to few of my friends.

  5. Rated 4 out of 5

    Milan Patel

    One of my friend suggested taking the kit from Edgefx.I decided to buy a kit from Edgefx because already assembled tested kit is included in that.The kit was delivered on time. I also referred to my friend named Mr. Rohith.