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What must be done in order to take additional iron losses into account in dc machines?
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To take additional iron losses into account in DC machines, one must consider the following steps:
1. Core Material Selection: Use high-quality magnetic materials with lower hysteresis losses for the core to reduce additional iron losses.
2. Magnetic Field Analysis: Conduct a magnetic field analysis to ensure that the flux density remains within the limits to minimize saturation and associated losses.
3. Loss Measurement: Perform tests to measure core losses at operating conditions, typically using a test setup to quantify both hysteresis and eddy current losses.
4. Temperature Effects: Account for temperature variations, as they can influence core losses; high temperatures can increase resistance and thus impact eddy current losses.
5. Design Optimization: Optimize the design of the core, including laminating the core to reduce eddy current losses and ensuring proper insulation between the laminates.
6. Frequency Adjustment: For machines operating at different frequencies, adjust the design and materials accordingly, since higher frequencies increase eddy current losses.
Calculating these losses during the design phase and adjusting operational parameters can help achieve better efficiency and performance in DC machines.
To account for additional iron losses in DC machines, the following steps can be undertaken:
1. Measure and Determine Iron Losses: Identify the core material and measure the core losses (hysteresis and eddy current losses) at varying frequencies and flux densities.
2. Adjust Parameters in Design: Incorporate the measured iron losses into the design calculations. This may involve selecting appropriate core materials and optimizing the machine geometry to minimize losses.
3. Use Loss Models: Implement loss models that take into account both hysteresis and eddy current losses for accurate predictions based on the operating conditions.
4. Increase the Efficiency of Core Material: Select high-quality magnetic materials to reduce hysteresis losses and optimize lamination thickness to minimize eddy current losses.
5. Test and Validate: Conduct tests on the prototype or the designed machine to validate the iron loss calculations and make necessary adjustments in the design or operation parameters.
By including these considerations, you can effectively account for additional iron losses in DC machines.
Answer: b
Explanation: In order to take additional losses into account the iron loss obtained from the iron loss curves is multiplied into 1.4-1.6 in dc machines and synchronous machines. The iron loss obtained from the iron loss curves is multiplied into 1.2-1.4 in induction motors.