As a device that converts electrical energy into mechanical energy, the motor generally works under high-speed rotation. However, how to let this dislocated wild horse slam the horse to let the prodigal son turn back, the key moment to stop and stop learning is not as simple as imagined. Say more about the operation of the oil pump motor, let us study the doorway that stops the motor today.
The way of civil and military, one by one. The gentleman can handle things. The same is true for the control of the oil pump motor. It is necessary to let the motor go into the working state when it is said to go, and it is also necessary to let the motor stop and listen to the conductor. If the electric car can't brake at any time, the elevator can't stop at the designated floor as desired, and the crane can't hang the suspended cargo in the air stably, what kind of ridiculous and chaotic scene?
How to make the oil pump motor rotate, the answer is relatively simple, give him electricity to let him output kinetic energy. But letting it stop at a critical moment is not so simple, how can the motor go to the climax and stop immediately? Today, Dalan Motor Xiaobian gives you a detailed look at how this dislocated wild horse is tamed.
In general, the braking of the motor is divided into two types, which are not technical and technical. The technical content is that the mechanical brake is simple and rough, and a large brake pad or brake can solve the problem. However, it is not reliable to rely on friction and friction to make custom movements. The brake pads may be dangerous after being worn. So what is the technical brake method? The technical content is called electric brake. Compared with the violent mechanical brake, electric brake is a kind of internal effort. Electric braking is subdivided into: reverse braking, dynamic braking and regenerative braking.
Reverse braking: Add a back electromotive force to the motor. The direction of rotation of the magnetic field is opposite to that of the rotor. The motor is stopped by the reverse torque. This method has high control requirements and may be reversed if you are not careful. Need to pay attention.
Energy consumption braking: DC energy is applied to the motor to consume kinetic energy. The braking effect and accuracy of this method alone are not ideal.
Regenerative braking: The motor working condition of the motor is converted into the working condition of the generator, and the kinetic energy of the flying is converted into electrical energy for storage, energy saving and low carbon. This method is widely used in electric vehicles.
In the national standard, how is the feed characteristics test defined?
During the test, the driven motor system is driven by the prime mover (dynamometer) and is in the feeding state. According to the experimental purpose and the measured parameters, the motor controller is driven by the DC bus voltage set by the motor controller. The motor is fed with a corresponding operating speed and torque load.
The load speed value is selected from more than 10 measurement points. The selected points should include the following special points:
Rated operating speed point;
Maximum working speed point;
The minimum operating speed point corresponding to the continuous power;
Other specially defined working points, etc.
Select more than 10 measurement points for the measured torque value. The selected points should include the following special points:
The point at which the torque value is sustained;
The point at the peak torque (or maximum torque) value;
a point on the continuous power curve;
The point on the peak power (or maximum power) curve;
Other specially defined working points, etc.
Record the DC bus voltage of the motor controller, the DC bus current, the AC voltage of each phase of the drive motor, the AC current, and the speed and torque of the motor shaft at the time of feeding, and calculate the power of the motor and controller. Feed efficiency, etc.
In fact, it is not just the brake and feed energy of the motor. For modern motor production and design, it is necessary to pay attention to the control performance of the motor in all aspects of motor operation. While understanding the steady-state characteristics of the motor, you should also pay more attention to the dynamic characteristics of the motor. An excellent motor must be walked away and stopped.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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