According to the financial news on March 16, 2024, according to the announcement of the State Intellectual Property Office, Shandong Haina Intelligent Equipment Technology Co., Ltd. applied for a patent named "Double Winding Disc Motor for Mining", with the publication number CN117713420A and the application date of December 2023.
The patent abstract shows that the present invention relates to the field of mining motor technology, especially a double winding disc motor for mining, including a motor housing, in which two stator winding assemblies are installed from front to back in the motor cavity of the motor housing, which are butted against each other along their axial direction. The two stator winding assemblies form a double winding structure, and a permanent magnet rotor unit is coaxially installed in the central cavity of the double winding structure. The front end of the motor shaft is movable and sealed to pass through the bearing hole of the positioning bearing installed at the center of the front end cover of the motor, and the rear end is supported in the bearing at the rear end cover of the motor. Each of the stator winding assemblies is fixedly mounted on the inner wall of the motor housing. The mining double-winding disc motor can be used in underground mining environments. Through the unique double-winding structure design, it can rely on two stator winding components to achieve the enhancement of the electromagnetic field after power-on, effectively ensuring the operation effect of the motor; at the same time, the corresponding heat dissipation structure is configured to achieve strong heat dissipation.
The reason why ordinary motors and variable frequency motors cannot interoperate is mainly due to their significant differences in design concepts, working characteristics, control methods, and application scenarios. Below is a detailed explanation of these differences and an in-depth analysis of why these differences prevent the two from interoperating.
1. Differences in design concepts and structures
Ordinary motor:
Design concept: Ordinary motors, also known as constant speed motors, are designed to provide constant rotational speed and power output. It mainly relies on the constant frequency and voltage power supply provided by the power grid to work, and controls the motor's speed and output power by changing the magnitude and phase difference of the voltage.
Structural features: The structure of ordinary motors is relatively simple, mainly composed of stator, rotor, shaft, bracket, end cover and winding. The stator is composed of an iron core and windings. When current passes through the windings, a rotating magnetic field is generated, which drives the rotor to rotate. The rotor is mostly made of copper or aluminum conductors and interacts with the stator's magnetic field through the principle of electromagnetic induction to generate torque.
Variable frequency motor:
Design concept: The variable frequency motor is a product of power electronics technology and is designed to accurately control the motor's speed and power output by adjusting the power frequency and voltage. It can automatically adjust the speed and torque according to changes in load to achieve efficient and energy-saving operation.
Structural features: The structure of a variable frequency motor may be more complex than an ordinary motor to adapt to its variable frequency speed regulation requirements. For example, its rotor might use permanent magnets or a specially designed electromagnetic structure to better respond to frequency changes. The stator windings may also have a multipole design to produce stable rotating magnetic fields at different frequencies.
2. Differences in working characteristics and control methods
Working characteristics:
Ordinary motor: When the input voltage, frequency, etc. remain unchanged, the output power and speed of an ordinary motor are also constant. Its speed adjustment range is limited and cannot be dynamically adjusted according to load changes.
Variable frequency motor: It has a wide speed regulation range (usually about 10% to 200% of the motor's rated speed), and can perform stepless speed regulation according to actual needs. At the same time, it can also achieve soft start, reducing the impact on the power grid and mechanical equipment during startup.
Control method:
Ordinary motor: Using the traditional power control mode, the motor speed and output power are mainly controlled by changing the voltage and phase difference.
Variable frequency motor: Using electronic control, the frequency converter adjusts the power frequency and voltage to achieve precise control of the motor speed and power. This control method enables the variable frequency motor to automatically adjust the speed and torque according to different load requirements, improving energy efficiency and service life.
3. Differences in application scenarios and performance requirements
Application scenarios:
Ordinary motors: Due to their simple structure, low cost and easy maintenance, they are widely used in various situations that do not require high speed regulation, such as fans, pumps, home appliances, transportation and other fields.
Variable frequency motor: It is more suitable for occasions with high requirements on speed regulation accuracy and energy saving, such as elevators, CNC machine tools, printing machinery and other equipment that require precise control of speed and torque.
Performance requirements:
There are also significant differences in performance requirements between ordinary motors and variable frequency motors. Ordinary motors mainly meet basic mechanical transmission needs, while variable frequency motors need to achieve higher speed regulation accuracy and energy-saving effects while ensuring transmission efficiency.
4. Why can’t they communicate with each other?
To sum up, there are significant differences between ordinary motors and variable frequency motors in terms of design concepts, operating characteristics, control methods, and application scenarios. These differences make the two incompatible in terms of electrical characteristics, mechanical characteristics, and control systems. Therefore, if you directly replace an ordinary motor with a variable frequency motor or vice versa, it will not only fail to meet the actual work needs, but may also cause damage to the equipment or cause safety hazards. Therefore, ordinary motors and variable frequency motors cannot be used interchangeably. In actual applications, the appropriate motor type should be selected according to specific work requirements and ensure its matching with the control system.
