Core conclusion: DC motors will not completely replace AC motors, but will only form scene differentiation and high-low matching patterns
Brushed DC will continue to shrink, but brushless DC (BLDC) will seize the mid to high end market;
Asynchronous/synchronous motors rely on their advantages of cost, high power, and resistance to harsh environments, and have long occupied the essential market. The two complement and coexist, and there is no one-way substitution.

1、 DC motor expansion, but with clear ceiling (taking range hood, home appliances, and industry as examples)
The irreplaceable advantage scenario of direct current (BLDC)
Energy saving, silent, wide intelligent speed regulation
Low speed high torque, wind pressure does not decay, suitable for high-rise public flue range hoods, variable frequency air conditioners, and high-end integrated stoves;
The continuously variable transmission is compatible with AI intelligent linkage, self-cleaning, and automatic boosting functions, with energy efficiency 20% to 35% higher than ordinary AC motors, and significant energy savings after long-term use.
Battery/DC power supply equipment
Electric vehicles, handheld tools, portable fans, and energy storage equipment can only use DC motors, and AC cannot be directly adapted to DC power sources.
Precision and low noise requirements
Bedroom air conditioning, fresh air, medical small equipment, BLDC brushless spark, lower vibration noise.
Shortcomings of DC motors being difficult to popularize (determining their inability to fully replace AC)
Higher overall cost
The complete set of accessories including permanent magnet, driver circuit board, MCU, and FOC control chip has significantly increased in price;
Low end affordable range hoods and fixed frequency fans are still preferred for cost control, and AC motors are still preferred.
High power and megawatt level operating conditions are inherently weak
After the power exceeds 1000kW, the volume, cost, and heat dissipation pressure of the DC motor increase sharply;
Mines, water pumps, ships, steel rolling mills, and large fans can only use AC motors.
Higher failure rate in harsh environments with oil pollution and dust
BLDC has a built-in precision drive board, which is prone to corrosion of circuits due to kitchen fumes, humidity, and high temperatures;
Asynchronous motors have no electronic board, only coils and bearings, are resistant to oil stains, high and low temperatures, have a lower failure rate, and are easy to maintain after sales.
High maintenance threshold
Most AC motors only need to replace windings/bearings when they break down;
DC motor faults often result in damage to the drive board, high repair costs, and poor universality of accessories.

2、 The core track of communication motors that can never be replaced
Affordable low-end home appliances, large-scale high-volume models
Hundred yuan exhaust fan, old-fashioned fixed frequency range hood, simple ventilation fan, single-phase AC pole/asynchronous motor structure minimalist, mature supply chain, price and factory cost crushing DC solution.
Industrial high-power continuous operation equipment
The 380V three-phase AC motor is suitable for industrial power grids, with easy implementation of megawatt level power, stable 24-hour continuous operation, and stronger explosion-proof, moisture-proof, and dust-proof capabilities. It is the only mainstream solution for factory fans, water pumps, and conveyor belts.
Pursuing extremely low after-sales service and avoiding complex electronic control scenarios
Snack stall exhaust fan, construction site ventilation, and old public kitchen smoke exhaust only require high and low gears, without the need for intelligent speed regulation. The AC motor is stable and durable for decades.
Simplified solution for power frequency direct drive
Directly connected to 220V mains power, without the need for rectifier or inverter circuit boards, with fewer fault points, making it more reliable for wet and oily kitchen basic models.

3、 Real industry trends (taking kitchen range hood as an example, tailored to your business)
Mid to high end range hoods and integrated stoves: The penetration rate of BLDC DC continues to increase, exceeding 70% by 2026. The core selling points of product upgrades are energy-saving, high wind pressure, and intelligent frequency conversion;
Offline low-end, engineering batch, and low-priced foreign trade models: AC motors are still the main force, relying on low prices to seize the sinking market and overseas affordable orders;
The technical boundary is blurred: high-end AC synchronous motor (PMSM)+frequency converter, brushless DC motor, performance is constantly approaching, but the differences in cost, reliability, and power supply adaptation cannot be smoothed out.

4、 Long term Development Summary
Traditional brushed DC motors: continue to be phased out, almost completely exiting the mainstream of home appliances and industry;
Brushless DC BLDC: High end energy-saving and portable lithium battery devices continue to penetrate, but due to cost and high power limitations, it cannot be fully covered;
Asynchronous/Synchronous Motor Communication: Adhere to the three basic principles of low-end parity, high-power industry, and harsh working conditions, and will never be replaced;
Final pattern: High end selection of DC, basic selection of AC, hierarchical use of large and small power, long-term parallel coexistence of the two types of motors.