WHY CHOOSE A HIGH-SPEED MOTOR
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The motor output is decided in proportion to the rotor capacity and rotation velocity;
High rotation velocity enables the design of a high-output motor
DESIGN PROCEDURE
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The main factors to be considered at preliminary design stage for high-speed induction motor are as follows.
① Electromagnetic design considerations :
additional high frequency losses, current density and magnetic flux density and iron losses.
② Mechanical design considerations :
centrifugal forces acting on rotor surface, critical speed, rotor slot shape and end-ring shape of rotor and losses of windage and friction.
③ System cooling considerations :
coolant passage on stator core, rotor cooling topology and temperature rise of stator coil.
HIGH-SPEED MOTOR COMPARISION
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ALUMINUM ROTOR (INDUCTION MOTOR)
PRINCIPLE
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Rotary power generated by the interaction between the magnetic force from
stator coil current and another flowing through a rotor bar (Aluminum)
MERITS/DEMERITS
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Sturdy structure, long lifespan
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Excellent for mass-production
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Power factor declines at high-speed operation
COPPER ROTOR (INDUCTION MOTOR)
PRINCIPLE
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Rotary power generated by the interaction between the magnetic force from
stator coil current and another flowing through a rotor bar (copper)
MERITS/DEMERITS
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High efficiency, long lifespan, low noise, low vibration
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Hard to manufacture; excellent for attaining high output
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Power factor declines at high-speed operation
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Excellent efficiency because of the decrease in rotor copper loss
PERMANENT MAGNET SYNCHRONOUS MOTOR
PRINCIPLE
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Rotary power generated by the magnetic force from the stator coil current and
drawing force of rotor permanent magnet
MERITS/DEMERITS
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High efficiency, low noise, compact structure; high manufacturing cost
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Risk of demagnetization of the permanent magnet
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Excellent power factor, which leads to current reduction
High efficiency design and optimal coolant design result in very low heat loss compared to a typical motor. Therefore, all models employ air cooling.
SHAFT [ROTOR]
- The rotor has no power transmission loss because the impeller and the motor cooling fan are directly connected.
- Balancing is performed in three steps to ensure dynamic stability during high-speed rotation.
STATOR [WINDING]
- It is designed to minimize iron loss.
- The cooling performance was improved by accurately predicting the air flow by the cooling fan.
- We have secured high efficiency and quality stability.
MOTOR COOLING
- The AIR COOLING method is applied to cool the motor directly using the air around the product. This is a cooling fan integrated with the shaft without a separate external cooling fan, providing the highest cooling efficiency with minimal loss.
- An efficient air flow path system has been established to ensure that cooling air optimally cools the motor.