UD103080A Alternator F000BL0688 F000BL06JF SJ14155 G104034 CAL10061GS 115420 20010061OV Battery charger 556493RI 55101349G
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Overview
General Description of Kubota Brushless AC Alternators
1. Overview
The Kubota brushless AC alternator is a high-performance, industrial-grade electromechanical power generation component independently developed and optimized by Kubota. Adopting advanced revolving field brushless excitation structure and integrated modular design, it converts mechanical energy into high-quality stable alternating current (AC) electrical energy. Eliminating traditional carbon brush and slip ring friction structures, it integrates exclusive Load Acceptance Module (LAM) and high-precision AVR regulation system. Featuring maintenance-free operation, strong load impact resistance, low harmonic distortion and extreme environmental adaptability, it is widely matched with Kubota original diesel generator sets, and serves as the core power equipment for commercial standby power, industrial supporting power, marine power systems and mobile engineering power supply scenarios.
2. Basic Working Principle
Kubota brushless AC alternators strictly follow Faraday’s Law of Electromagnetic Induction, adopting a mature two-stage brushless excitation and closed-loop automatic voltage regulation working mechanism. The exclusive optimized control logic enables the equipment to maintain stable voltage output under variable speed, sudden load change and harsh power consumption conditions, with outstanding dynamic response performance.
During startup, the residual magnetism of the main rotor pole induces weak residual voltage in the exciter stator winding. The independent detection circuit of the Kubota customized Automatic Voltage Regulator (AVR) accurately collects voltage signals and outputs adjustable DC excitation current to the exciter stator, forming a stable fixed magnetic field. Driven by the coaxial main shaft, the exciter rotor synchronously rotates and cuts the magnetic field to generate intermediate-frequency AC power. The high-stability rotating rectifier module fixed on the rotating shaft instantly converts the intermediate-frequency AC into pure DC excitation current, which is accurately transmitted to the main rotor field winding without intermediate loss.
Subsequently, the main rotor generates a uniform and stable rotating magnetic field under DC excitation. The high-purity copper main stator three-phase winding cuts the rotating magnetic field lines to induce standard sinusoidal AC power. Equipped with the proprietary Load Acceptance Module (LAM), the alternator effectively buffers instantaneous load impact, accelerates rated speed recovery, and ensures continuous, stable and low-distortion AC power output to the external load circuit. The entire contact-free operation process avoids electric spark interference and mechanical wear, realizing long-term reliable power generation.
3. Main Structural Components
Kubota brushless AC alternator adopts a compact integrated coaxial layout and full modular design, with all core components manufactured in accordance with Kubota’s original industrial standards. The whole machine features high structural rigidity, strong anti-vibration capability and excellent heat dissipation performance, mainly including a main generator unit, dedicated AC exciter unit, high-speed rotating rectifier module, customized AVR system and Class H insulating components.
3.1 Main Generator Unit
As the core power generation component, it consists of a high-rigidity fixed main stator and a high-precision rotating main rotor. The main stator is embedded with 100% high-purity copper symmetric windings and matched with high-quality laminated silicon steel sheets, which effectively reduces magnetic flux loss and eddy current loss, and significantly improves power generation efficiency. The main rotor adopts an optimized revolving field structure, with dynamically balanced calibration to reduce operating vibration. Supported by Class H high-temperature insulation technology, it can stably operate under high-load and high-temperature conditions for a long time, ensuring low-distortion sinusoidal voltage output.
3.2 AC Exciter Unit
It is a dedicated brushless excitation component customized for Kubota power generation systems, composed of a fixed exciter stator and a synchronous rotating exciter rotor. The exciter stator receives precise DC excitation current from the AVR to form a constant and uniform excitation magnetic field. The exciter rotor operates synchronously with the main shaft to generate stable intermediate-frequency AC power, providing continuous and reliable excitation power for the main generator. This integrated brushless excitation structure completely abandons the traditional brush slip-ring structure, realizing zero wear excitation operation.
3.3 Rotating Rectifier Module
This high-reliability modular component is coaxially installed with the rotor and operates synchronously. It is composed of industrial-grade high-current rectifier diodes and overvoltage and overcurrent protection devices. Its core function is to efficiently convert the intermediate-frequency AC power generated by the exciter rotor into pure DC excitation current for the main rotor winding. With integrated packaging and rapid heat dissipation design, the module has strong overcurrent resistance and high operational stability, adapting to frequent load switching working conditions.
3.4 Customized Automatic Voltage Regulator (AVR)
The exclusive independent AVR system is the intelligent control core of Kubota alternators. Different from ordinary regulators, its voltage detection circuit is independently powered, so the regulation accuracy will not be affected by load waveform distortion. It real-timely monitors output voltage, current and load changes, automatically adjusts excitation current in real time, and dynamically stabilizes rotor magnetic field strength. It ensures the voltage regulation rate is controlled within ≤±1% under no-load, full-load and sudden variable load conditions, effectively suppressing voltage fluctuation and improving overall power supply quality.
4. Common Classification
According to power grade, phase number and application scenarios, Kubota brushless AC alternators are divided into two mainstream series, covering small civil and medium industrial full-scenario power supply demands:
4.1 Single-Phase Kubota Brushless Alternator
This series features compact structure, light weight and low energy consumption, covering small power segments from 5kVA to 15kVA. It supports standard single-phase AC output, with simple and stable operation. It is mainly matched with small Kubota diesel generator sets, widely used in household emergency power supply, mobile equipment power supply, commercial retail standby power and daily lighting power supply scenarios, featuring convenient operation and low maintenance cost.
4.2 Three-Phase Kubota Brushless Alternator
It is Kubota’s mainstream industrial-grade model, covering medium power segments from 15kVA to 50kVA and above. It adopts balanced three-phase voltage output design, with high power density, strong overload capacity and excellent load adaptability. It is widely equipped in Kubota KJ series and other medium and large generator sets, suitable for industrial production lines, engineering machinery, marine power systems, communication base station standby power and other high-power, high-stability power supply scenarios.
5. Core Advantages
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Genuine Brushless Maintenance-Free Design: Completely eliminates carbon brushes and slip rings, avoiding carbon dust accumulation, brush wear and contact failure. It realizes long-term maintenance-free operation, greatly reducing later operation and maintenance costs and downtime loss.
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Superior Load Impact Resistance: Equipped with exclusive Load Acceptance Module (LAM), it can quickly adapt to sudden load increases, effectively buffer instantaneous impact current, and realize rapid recovery of rated speed and voltage, with excellent dynamic working performance.
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High-Precision Voltage Regulation Performance: Adopting independently powered AVR regulation system, free from load distortion interference. The voltage regulation accuracy is as high as ≤±1%, with extremely low harmonic distortion, providing ultra-stable high-quality power for precision electrical equipment.
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Extreme Environmental Adaptability: Supported by Class H full insulation system and optimized sealing structure, it is resistant to high temperature, dust, humidity and vibration. It can operate stably in harsh working environments such as construction sites, ships and field operations, with extremely low failure rate.
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High Efficiency and Energy Saving: Adopting high-purity copper winding and optimized magnetic circuit design, the power generation conversion efficiency is greatly improved. With low mechanical loss and low electromagnetic noise during operation, it meets industrial energy-saving and environmental protection standards.
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High Matching Compatibility: Original factory customized structure, perfectly matched with Kubota original diesel engines and generator sets, with stable power transmission, low power loss and high overall system coordination.
6. Main Applications
Kubota brushless AC alternators are widely used in high-reliability and long-duration power supply scenarios worldwide. In the industrial field, they serve as the core power components of Kubota industrial diesel generator sets, providing stable main power and standby power for factories, mines and construction projects. In the marine and mobile engineering field, they adapt to complex working conditions such as ship vibration and field dust, and are applied to ship power systems and engineering mobile power equipment. In the commercial and emergency power supply field, they are used for standby power supply of commercial buildings, medical institutions and communication base stations. In addition, they are also widely used in off-grid household power supply, new energy supporting power and rental power equipment scenarios, and are highly recognized for their stable performance and durable quality.
7. Conclusion
Integrating Kubota’s decades of electromechanical manufacturing experience, the Kubota brushless AC alternator adopts advanced brushless excitation technology, exclusive LAM load adaptation system and high-precision AVR voltage regulation technology. It has outstanding advantages in operational reliability, power supply quality, environmental adaptability and maintenance economy. Compared with ordinary ordinary alternators, it has more stable dynamic performance and longer service life. It has become a high-quality matching core component of medium and small generator sets in the global market, providing efficient, stable and safe power guarantee for industrial production, commercial operation and emergency power supply, and has high industry popularity and application value.
Applications List
Voltage
12
Amperage
90
Free wheel pulley
CW
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UD103080A Alternator F000BL0688 F000BL06JF SJ14155 G104034 CAL10061GS 115420 20010061OV Battery charger 556493RI 55101349G
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价格范围：$150.00 至 $220.00
