You asked: Why DC motor is bigger than AC motor?

The main reason why DC motor is bigger is, it has internal cooling. DC motor rotor and stator both need cooling. So it must accommodate internal fan or external separate blower. AC motor has external cooling.

Why the DC motor cost is higher than the AC motor by?

The rotor design is probably the most important factor in making the DC motor more expensive. If the DC motor stator has permanent magnets, that could make it more expensive or not depending on the magnet material. There are many more manufacturers making AC motors and many more AC motors used at 1000 kW.

Are DC motors smaller than AC motors?

For a given amount of mechanical work output, AC motors are usually larger than DC motors, with brushless DC designs being the smallest.

What is the difference between an AC motor and a DC motor?

The most obvious difference is the type of current each motor turns into energy, alternating current in the case of AC motors, and direct current in the case of DC motors. AC motors are known for their increased power output and efficiency, while DC motors are prized for their speed control and output range.

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Which is more powerful DC motor or AC motor?

Which Motor Is More Powerful: AC or DC? AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.

Are DC or AC motors cheaper?

However, DC motors are expensive to purchase and to maintain. In addition, over the past 10 years, AC drives have improved to the point where their speed control is far more precise, rivaling that of servo drives. What’s more, the AC motor and drive together often cost about the same price as the DC motor alone.

What are the disadvantages of DC motors?

Disadvantages of DC motors

  • High initial cost.
  • Increased operation and maintenance cost due to the presence of commutator and brush gear.
  • Cannot operate in explosive and hazard conditions due to sparking occur at brush (risk in commutation failure)


Can a DC motor run on AC?

A DC motor can be run on AC by rectifying the AC source, providing the supply voltage and available current from the circuit is sufficient for the rating of the motor. To run an AC motor off a DC supply requires a DC-AC converter.

Does Tesla use AC or DC motors?

Tesla, for example, uses alternating current (AC) induction motors in the Model S but uses permanent-magnet direct current (DC) motors in its Model 3. There are upsides to both types of motor, but generally, induction motors are somewhat less efficient than permanent-magnet motors at full load.

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Why don t Electric cars use DC motors?

The only “DC” motor which does not require some form of inverter or electronic switching system is the mechanical brushed motor. These are so unsuited to the task of light weight variable speed drives that there will be few if any used in modern electric car designs.

Why does Tesla use an AC induction motor?

So, why does Tesla use 3-phase AC induction motors instead of DC motors? Tesla uses AC induction motors because it has more torque even at high speed, simple design, cost-effective, do not need rare earth minerals rich permanent magnet, high reliability, and easier regenerative braking system design.

Which is better AC or DC?

Alternating current is cheaper to generate and has fewer energy losses than direct current when transmitting electricity over long distances. Although for very long distances (more than 1000 km), direct current can often be better.

Where is DC motor used?

Small DC motors are used in tools, toys, and appliances. The universal motor can operate on direct current but is a lightweight brushed motor used for portable power tools and appliances. Larger DC motors are currently used in propulsion of electric vehicles, elevator and hoists, and in drives for steel rolling mills.

What is the most efficient motor?

ABB recently set the world record for electrical synchronous motor efficiency. During factory acceptance tests (FATs) carried out with the customer present, we recorded a result of 99.05% full load efficiency on a 44 megawatt, 6-pole, synchronous motor.

Why starter is used in case of DC motor?

Starters are used to protect DC motors from damage that can be caused by very high current and torque during startup. They do this by providing external resistance to the motor, which is connected in series to the motor’s armature winding and restricts the current to an acceptable level.

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Who invented DC motor?

Электрический двигатель/Изобретатели