Which is better, BLDC motor or DD direct drive motor?

Now when choosing a washing machine, in addition to capacity, appearance, and function, the motor is also included in the consideration range. Xiaomei will tell you the difference between BLDC motors and DD direct drive motors that are commonly seen in popular science today. First of all, let’s distinguish between direct drive and non-direct drive:

Direct drive: The motor directly drives the washing machine wave plate or inner drum through (or without) the clutch without belt transmission.

Direct drive: The motor is driven by a belt, with (or without) a clutch to drive the washing machine disc or inner tub.

The common DD before direct drive, the full name is direct drive, translated into Chinese is also direct drive. Direct drive means that there is a direct connection between the motor and the load (washing machine wave plate or inner cylinder), without the use of belts, gears, etc. So direct drive refers to the drive mode, which is a form of motor-driven load (direct drive, no transmission). Imagine the classic scene of turning a tape with a pen as a child (pictured below), if the pen is compared to a motor that outputs power, and the load is at hole A, it is a direct drive. The load is at the B hole and is driven by the belt, so it is a non-direct drive.

The drive motor of the direct drive, that is, the pen, can choose any motor such as DC motor, AC motor, ultrasonic motor, etc. The DD direct drive motors in the washing machine industry are all torque servo motors, DD+torque servo motors, collectively referred to as DD direct drive motors.

There are many kinds of motors with non-direct drive mode. The category develops from non-variable frequency to frequency conversion, and in frequency conversion, it develops from AC frequency conversion to DC frequency conversion. The full name of BLDC is brushless dc motor, and the Chinese name is Washing machine DC Motor.

So there is such a saying, BLDC motor and DD direct drive motor, one refers to the motor that drives the load, and the other refers to the way to drive the load, which is not the same thing and cannot be compared. Indeed, in the motor industry, it is difficult to give a judgment of superiority and inferiority. After taking inventory, you will find that they have their own advantages. What should be considered when purchasing is what kind of motor is required in the application scenario, whether it needs a large output or low noise? Do you care about a quick start, or a high speed? These are the points we need to pay attention to. When choosing a motor, don't buy the expensive one, just buy the right one.

Although BLDC motor and DD direct drive motor, one is indirect drive and the other is direct drive, there is no good or bad driving method, but direct drive motor is good or bad, in order to make the drum run at high speed, the direct drive motor must Very stable, safe, durable and precise.

Midea's new direct drive series is the first to see the series, and the direct drive motor used is the fifth-generation DD direct drive that has undergone 4 iterations of innovation. The inefficiency and instability of the first-generation direct drive have been eliminated, the second-generation direct drive is bulky and easy to demagnetize, and the third-generation ordinary direct-drive coils have few coils, low precision, and insufficient torque. The fourth-generation traditional direct-drive plastic casing is easily damaged, and the motor High failure rate.

Midea's fifth-generation direct drive motor uses metal casing to replace plastic casing, which is more firm and stable, anti-corrosion, anti-deformation, durable and more durable. Use PBT flame retardant material with higher ignition point and safer, and use 9 holes to fix the motor and load, which is more firm and stable. The rotor iron core is used inside the motor, and the magnetic force is large and the power is sufficient. The upgraded motor runs as usual 20 years after the test, and the failure rate of the metal motor is low.

And in the silk soft washing program, the decibel of the fifth-generation DD direct-drive laundry is only 45db, which is only slightly higher than 40db in the library environment. When the baby is sleeping, the laundry will not disturb the TA. It is suitable for high requirements on laundry noise and quiet laundry. don't disturb family