Question on Direct Current Drives

In summary, a 200V DC motor is being driven by a single quadrant chopper at 20kHz with a 350V DC input. Its armature resistance and inductance are 0.5 ohm and 5mH, respectively, with a torque constant of 1.5 Nm/A. The question is asking for the minimum load torque that the motor can deliver while ensuring continuous mode of operation for all duty factors.
  • #1
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Homework Statement


A seperately excited 200V DC motor is driven by a single quadrant chopper receiving a 20kHz pwm signal. It is operating on 350 V DC input. Its Armature resistance and inductance are 0.5 ohm and 5mH respectively and has a torque constant k=1.5 Nm/A.


Homework Equations



(Back emf of armature = k*angular velocity, Torque = k*armature current).

The Attempt at a Solution



The first few parts of the question were to find the speed and duty factor and ripple current under different conditions.

It is the last part that's giving me trouble. In its exact wording it reads:

"What is the minimum load torque that the motor can deliver while ensuring continuous mode of operation for all duty factors?"

I tried thinking about the rated voltage and the voltage across the motor not exceeding the rated voltage but found no success.
 
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  • #2
I'm not sure what the minimum load torque could be and how to calculate it. Any help would be appreciated!
 

1. What is a direct current drive?

A direct current drive is a type of motor drive that converts electrical energy from a direct current (DC) power source into mechanical energy, which is used to power a motor. It is commonly used in applications that require precise speed control and high torque at low speeds.

2. How does a direct current drive work?

A direct current drive works by using electronic components, such as transistors and diodes, to convert the incoming DC power into a different form of energy that can be used to power the motor. This conversion process involves controlling the amount of current and voltage supplied to the motor, which allows for precise speed and torque control.

3. What are the advantages of using a direct current drive?

Some of the advantages of using a direct current drive include high torque at low speeds, precise speed control, and efficient use of energy. DC drives are also relatively simple and reliable, making them suitable for a wide range of industrial and commercial applications.

4. What are the main components of a direct current drive?

The main components of a direct current drive include a rectifier, which converts AC power into DC power, a chopper, which controls the amount of power supplied to the motor, and a feedback system, which monitors and adjusts the speed and torque of the motor. Other components may include a controller, power supply, and protective devices.

5. What are some common applications of direct current drives?

Direct current drives are commonly used in applications such as electric vehicles, elevators, robots, and conveyor systems. They are also used in industrial machinery, such as pumps, fans, and compressors, as well as in renewable energy systems, such as wind turbines and solar panels.

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