18249079. MOTOR DRIVING APPARATUS, REFRIGERATION CYCLE EQUIPMENT, AND AIR CONDITIONER simplified abstract (Mitsubishi Electric Corporation)
MOTOR DRIVING APPARATUS, REFRIGERATION CYCLE EQUIPMENT, AND AIR CONDITIONER
Organization Name
Mitsubishi Electric Corporation
Inventor(s)
Kazunori Hatakeyama of Tokyo (JP)
MOTOR DRIVING APPARATUS, REFRIGERATION CYCLE EQUIPMENT, AND AIR CONDITIONER - A simplified explanation of the abstract
This abstract first appeared for US patent application 18249079 titled 'MOTOR DRIVING APPARATUS, REFRIGERATION CYCLE EQUIPMENT, AND AIR CONDITIONER
Simplified Explanation
The patent application describes a control device that uses PWM control to drive a motor through an inverter. The device generates voltage command values based on current deviations and performs non-interference control during normal operation. However, during over-modulation, the device generates voltage command values without using the result of the integral calculation and only performs non-interference control. The voltage command values are then corrected based on a modulation factor, which determines the AC voltages applied to the motor.
- The control device performs PWM control over an inverter to drive a motor.
- Voltage command values are generated based on current deviations and non-interference control during normal operation.
- During over-modulation, voltage command values are generated without using the result of the integral calculation and only performing non-interference control.
- The voltage command values are corrected based on a modulation factor to ensure AC voltages applied to the motor are proportional to the modulation factor.
- This innovation allows the motor to be operated over a wide range within an over-modulation range.
Potential Applications
This technology can be applied in various industries and applications that require precise control of motors driven by inverters. Some potential applications include:
- Electric vehicles: The control device can be used to drive the motors in electric vehicles, providing efficient and precise control over the motor's speed and torque.
- Industrial automation: The technology can be implemented in industrial automation systems to control motors used in manufacturing processes, robotics, and other applications.
- Renewable energy: The control device can be utilized in renewable energy systems, such as wind turbines and solar power plants, to optimize the performance of the motors driving the generators.
Problems Solved
The technology addresses several problems associated with PWM control and over-modulation in motor driving systems:
- Non-interference control: By performing non-interference control during normal operation, the device ensures stable and accurate motor control, reducing the risk of malfunctions and damage.
- Over-modulation range: The innovation allows the motor to be operated within an over-modulation range, expanding the range of operation and providing flexibility in motor control.
- Voltage correction: The correction of voltage command values based on the modulation factor ensures that the AC voltages applied to the motor are proportional to the desired modulation, improving the overall performance and efficiency of the motor.
Benefits
The technology offers several benefits for motor control systems:
- Improved control accuracy: By generating voltage command values based on current deviations and non-interference control, the device provides precise control over the motor's speed and torque.
- Wide operating range: The ability to operate the motor within an over-modulation range allows for greater flexibility and adaptability in various applications.
- Enhanced efficiency: The correction of voltage command values based on the modulation factor ensures that the AC voltages applied to the motor are optimized, resulting in improved energy efficiency and reduced power losses.
Original Abstract Submitted
In a control device performing PWM control over an inverter for driving a motor, voltage command values are generated using voltage values obtained by performing proportional and integral calculation on current deviations and non-interference control during normal operation, and the voltage command values are generated without using the result of the integral calculation and performing only the non-interference control, at the time of over-modulation. Moreover, the voltage command values are corrected based on a modulation factor. A correction coefficient is so determined that the AC voltages applied to the motor become close to values proportional to the modulation factor. The motor can be operated over a wide range within an over-modulation range.
