Proportional Control for A Motor

[State Space]

I am working on a project that requires me to use flow rate sensor which generate a pulsed frequency typically around 4.5volt and based on the pulse, A motor speed is controlled. I figured component that i need to use for the control system :
1. Frequency to voltage convert - LM2901
2. OPamp - MCP6002
3. Driver - IRLZ44N
The issue is i want to do simulation on LT spice numbering are not the same. so i am confused as to how to build the circuit.

[Benta]

Huh? LM2901 is a quad comparator.

[tooki]

I am working on a project that requires me to use flow rate sensor which generate a pulsed frequency typically around 4.5volt and based on the pulse, A motor speed is controlled. I figured component that i need to use for the control system :
1. Frequency to voltage convert - LM2901
2. OPamp - MCP6002
3. Driver - IRLZ44N
The issue is i want to do simulation on LT spice numbering are not the same. so i am confused as to how to build the circuit.

Well of course the pinout is not the same, since you've selected a completely different part from a different manufacturer.

The LM2907 is a frequency to voltage converter from TI. This is the part you want to simulate.
The LM2901 is a quad comparator from TI and others. This is the part you cite above.
The LTC2907 is a dual power supply monitor from Analog Devices. This is the part you inserted in LTspice.
The LT290 you used as the file name for the first image is a part number that doesn't exist.
The LT2907 you used as the file name for the second image is a part number that doesn't exist.

Electronics requires precision — you can't just fudge part numbers and expect them to be the same!!

[floobydust]

Is this a school homework question?

I recognize OP's block as the LM2917 SOIC/DIP-14. The LM2907 SOIC/DIP-8 does not have the extra pins to breakout the signal. The LTC2907 is a completely different beast.

[State Space]

I thought they  were the same thing but I now  have  the model. I am just new to building circuit. I need help to be able to build the circuit i described. How do i go about selecting the  component to use.
This formula i found in LM2907 website :VOUT = fIN × VCC × R1 × C1 but i dont know how to implement it

[lichurbagan]

I am working on a project that requires me to use flow rate sensor which generate a pulsed frequency typically around 4.5volt and based on the pulse, A motor speed is controlled. I figured component that i need to use for the control system :
1. Frequency to voltage convert - LM2901
2. OPamp - MCP6002
3. Driver - IRLZ44N
The issue is i want to do simulation on LT spice numbering are not the same. so i am confused as to how to build the circuit.

I think you are telling the model number wrong. LM2901 is a Quad comparator, not a Frequency to voltage converter.

[Kilrah]

What are the exact specs of the input signal? Is it actually a frequency or a timing/duty cycle?
You typically use a microcontroller for that these days. Sample the input precisely, apply the right algorithm to control a PWM output that goes to an appropriate driver.

[State Space]

The input is a 4.5v pulsed frequency from a flow rate sensor which is then converted to analog voltage signal by the frequency to voltage regulator and the to the Difference amplifier before going to the driver

[BeBuLamar]

So it's kind like a PID loop that control the motor speed to obtain a set flow rate?

[State Space]

No sir, What i want it do is based on the output of a 5vflow rate sensor which output 3v controls a 5volt pump. The input is first fed to a frequency to voltage converter (LM2917 -N) which is now fed to mcp6007 to which will reject any voltage below 1v while proportional increasing the voltage beyond by a Gain of 2   required voltage to dive the pump motor. Ideally this is what i want to design
What do you think is the approach okay, the constraint was not using Micro controller.
thanks

[MarkF]

You appear to be so certain of the solution that I don't see that you need our help.

HOWEVER:

You have left out two of the most important things.
  - Exactly what is the flow sensor (or datasheet) that you're using.
  - Specs of the motor.
We can't design middleware without knowing the details of the inputs and outputs.

QUESTIONS:

• Do you already have a working device that you are trying to redesign?
  
  
• "The input is a 4.5v pulsed frequency from a flow rate sensor."  This could be several different things.
  
  
• Why convert the freq-to-voltage conversion?  Can you not just PWM the motor for speed control?
  
  
• Why the aversion to a microcontroller? 
  You may be able to accomplish the task with just hardware, but it may need more components and be more complex. 
  Is it because you have no programming experience?
  
  
• The transistion between motor On and Off may be tricky without a MCU.  You don't want to motor sitting in a stalled state.
  

[Kilrah]

Why the aversion to a microcontroller? 
You may be able to accomplish the task with just hardware, but it may need more components and be more complex. 
Is it because you have no programming experience?

I'm guessing it's a school assignment to figure out a solution without access to the obvious one...

The transistion between motor On and Off may be tricky without a MCU.  You don't want to motor sitting in a stalled state.

Yup

[State Space]

I actually  love programming. It is like a project that am i asked to worked on at a place where i intern. the constraint was placed by the person i am working with. my focus for now is to simulate the the design and bring out constraint as to why micro controller might be better. I am just trying to do research about what i need which i may be wrong and that is why i am trying to seek advice on what to do. And for the output of a flow rate sensor gives a voltage of 4.5v which is like a pulse. The actuator is a 5v dc motor

[MarkF]

. . . 
the output of a flow rate sensor gives a voltage of 4.5v which is like a pulse. The actuator is a 5v dc motor

4.5V like a pulse is NOT a specification.  (Example: How does freq pulse vary with flow?)
 - Provide part number and/or datasheet

Neither is a 5V DC motor.
 - At least provide its current requirement


You are asking us to read your mind.       

[Kilrah]

A flow sensor gives pulses, right, but it's not that "they're 4.5V" that it matters, it's a digital signal and the useful information is encoded in the frequency i.e. pulse count per unit of time.
So as a start you probably want to to figure out how many pulses per second or whatever you're gonna get with the flows you have to measure.

Were those IC refs given as example by your trainer too? "here's a few things, figure out how to put them together?"