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As the reserves of rare earths continue to decline year after year, these elements have become increasingly important on a national level. This is primarily due to their scarcity and versatile usage across various industries. However, the mining, processing, and utilization of these elements pose significant environmental challenges, such as soil degradation and water contamination.
To address these sustainability issues and lessen environmental impact, the development and implementation of synchronous reluctance motors have emerged as a promising solution. These motors eliminate the need for rare earths, offering an efficient and eco-friendly alternative. Huima Technology, a leader in the field, is using innovative "black technology" to lead this change. The company is committed to driving this responsibility and aligning its operations to effectively respond to national development trends, setting a standard for others to follow.
Synchronous reluctance motors, with their high performance, efficiency, low cost, and energy-saving emission reduction capabilities, distinguish themselves among many motor categories. Due to their unique advantages over asynchronous motors and permanent magnet synchronous motors, they have promising applications in traditional transmission fields and emerging electric vehicle drives.
| DC | AC asynchronous motor | Switched Reluctance Motor | Permanent magnet synchronous motor | |
|---|---|---|---|---|
| Synchronous Reluctance Motor VS | No brushes and commutators, simple and reliable, easy to maintain | Rotor without winding (no loss), high efficiency | Continuous change of reluctance, small torque ripple, low noise, mature platform, reducing control cost | The rotor is made of silicon steel, which has low cost and no demagnetization problem. It is more reliable and stable for long-term use. |
Because the parameters of synchronous reluctance motors change more drastically than those of permanent magnet synchronous motors, it brings problems to control. In order to obtain excellent static and dynamic performance, it is necessary to obtain accurate motor parameters, magnetic chain observation accuracy, and speed observation accuracy. In view of the above problems and difficulties, our company has carried out in-depth research and optimization on the open loop vector control technology of synchronous reluctance motors on the HMD21 series VFD for SynRM platform, and has achieved outstanding results.
The block diagram of the open loop vector control
(1) Based on the existing leading vector control software platform, a new magnetic flux observer is used to achieve lower motor parameter sensitivity, accurate rotor position observation and accurate current decoupling.
(2) In addition to the conventional self-learning of the HMD21 series VFD for SynRM, a new saturation parameter learning function has been newly developed, with short learning time and high learning accuracy. The d and q-axis inductance saturation characteristic parameters of the motor under different magnetic field saturation levels can be obtained through learning, so that the motor can be controlled more accurately; the following figure shows the learning results of the inductance saturation curve of a synchronous reluctance motor used in the field.
New saturation parameter learning function
(3) Excellent MTPA control: The maximum torque-current ratio control is adopted. When the same torque is generated, the dq-axis stator current is optimally distributed to minimize the stator current, thereby minimizing the stator copper consumption and achieving the optimal efficiency.
MTPA control
(4) Optimize the field weakening control. MTPA control of the motor below the base speed, field weakening control above the base speed, the maximum use of the voltage limit to maximize the output torque and expand the constant power range.
(1) Excellent low-frequency characteristics: Our HMD21 series VFD for SynRM drives a synchronous reluctance motor with a speed regulation ratio of 50:1. This means that at a rated frequency of 100HZ, it can drive full load at 2HZ, and at a rated frequency of 50HZ, it can drive full load at 1HZ.
(2) High-performance, high-stability, and high-precision: Our synchronous reluctance motor drive technology is internationally advanced.
(3) Excellent over-voltage and over-current suppression.
Over-current suppression
Over-pressure suppression
(4) The following is a part of the performance test waveform chart:
Acceleration and deceleration time 0.1s, no-load rapid acceleration and rapid deceleration from 0 to rated frequency
Acceleration / deceleration time 0.1s, full acceleration from 0 to rated frequency
Sudden load and unload 180% rated load
HMD21 series inverter synchronous reluctance motor open loop vector control technology can drive the synchronous reluctance motor stably and reliably, and has achieved excellent control effect. With the synchronous reluctance motor, the energy efficiency can reach the IE5 standard or higher. This is the first domestic application of synchronous reluctance motor control technology to the general product, which has been fully recognized by customers all over the world.
As the reserves of rare earths continue to decline year after year, these elements have become increasingly important on a national level. This is primarily due to their scarcity and versatile usage across various industries. However, the mining, processing, and utilization of these elements pose significant environmental challenges, such as soil degradation and water contamination.
To address these sustainability issues and lessen environmental impact, the development and implementation of synchronous reluctance motors have emerged as a promising solution. These motors eliminate the need for rare earths, offering an efficient and eco-friendly alternative. Huima Technology, a leader in the field, is using innovative "black technology" to lead this change. The company is committed to driving this responsibility and aligning its operations to effectively respond to national development trends, setting a standard for others to follow.
Synchronous reluctance motors, with their high performance, efficiency, low cost, and energy-saving emission reduction capabilities, distinguish themselves among many motor categories. Due to their unique advantages over asynchronous motors and permanent magnet synchronous motors, they have promising applications in traditional transmission fields and emerging electric vehicle drives.
| DC | AC asynchronous motor | Switched Reluctance Motor | Permanent magnet synchronous motor | |
|---|---|---|---|---|
| Synchronous Reluctance Motor VS | No brushes and commutators, simple and reliable, easy to maintain | Rotor without winding (no loss), high efficiency | Continuous change of reluctance, small torque ripple, low noise, mature platform, reducing control cost | The rotor is made of silicon steel, which has low cost and no demagnetization problem. It is more reliable and stable for long-term use. |
Because the parameters of synchronous reluctance motors change more drastically than those of permanent magnet synchronous motors, it brings problems to control. In order to obtain excellent static and dynamic performance, it is necessary to obtain accurate motor parameters, magnetic chain observation accuracy, and speed observation accuracy. In view of the above problems and difficulties, our company has carried out in-depth research and optimization on the open loop vector control technology of synchronous reluctance motors on the HMD21 series VFD for SynRM platform, and has achieved outstanding results.
The block diagram of the open loop vector control
(1) Based on the existing leading vector control software platform, a new magnetic flux observer is used to achieve lower motor parameter sensitivity, accurate rotor position observation and accurate current decoupling.
(2) In addition to the conventional self-learning of the HMD21 series VFD for SynRM, a new saturation parameter learning function has been newly developed, with short learning time and high learning accuracy. The d and q-axis inductance saturation characteristic parameters of the motor under different magnetic field saturation levels can be obtained through learning, so that the motor can be controlled more accurately; the following figure shows the learning results of the inductance saturation curve of a synchronous reluctance motor used in the field.
New saturation parameter learning function
(3) Excellent MTPA control: The maximum torque-current ratio control is adopted. When the same torque is generated, the dq-axis stator current is optimally distributed to minimize the stator current, thereby minimizing the stator copper consumption and achieving the optimal efficiency.
MTPA control
(4) Optimize the field weakening control. MTPA control of the motor below the base speed, field weakening control above the base speed, the maximum use of the voltage limit to maximize the output torque and expand the constant power range.
(1) Excellent low-frequency characteristics: Our HMD21 series VFD for SynRM drives a synchronous reluctance motor with a speed regulation ratio of 50:1. This means that at a rated frequency of 100HZ, it can drive full load at 2HZ, and at a rated frequency of 50HZ, it can drive full load at 1HZ.
(2) High-performance, high-stability, and high-precision: Our synchronous reluctance motor drive technology is internationally advanced.
(3) Excellent over-voltage and over-current suppression.
Over-current suppression
Over-pressure suppression
(4) The following is a part of the performance test waveform chart:
Acceleration and deceleration time 0.1s, no-load rapid acceleration and rapid deceleration from 0 to rated frequency
Acceleration / deceleration time 0.1s, full acceleration from 0 to rated frequency
Sudden load and unload 180% rated load
HMD21 series inverter synchronous reluctance motor open loop vector control technology can drive the synchronous reluctance motor stably and reliably, and has achieved excellent control effect. With the synchronous reluctance motor, the energy efficiency can reach the IE5 standard or higher. This is the first domestic application of synchronous reluctance motor control technology to the general product, which has been fully recognized by customers all over the world.
