101-24201 10124201 714-40388 71440388 ALD0019 Alternator ALD1019 A-1701 A1701 714-40473 71440473 Battery charger ALT2698 48-6922 486922 714-0537 7140537
item#: CUMMINS DELCO-1-1
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Overview
General Description of Delco Remy Brushless AC Alternators
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1. Overview
Delco Remy is a globally renowned brand of heavy-duty electrical power generation equipment, specializing in the design and manufacturing of high-reliability alternators for commercial vehicles, industrial machinery and off-road heavy equipment. Delco Remy brushless AC alternators adopt advanced brushless excitation structure and optimized industrial-grade design, completely eliminating traditional carbon brush and slip-ring wearable components. With outstanding vibration resistance, extreme temperature adaptability, low RFI (Radio Frequency Interference) and high power density, these alternators deliver stable and efficient AC power output. Mainly covering classic SI series models including 34SI, 36SI and 55SI, they are widely recognized as core power supply components for heavy-duty trucks, construction machinery, agricultural equipment and stationary industrial power systems, featuring long service life and ultra-low maintenance requirements.
2. Basic Working Principle
Delco Remy brushless AC alternators operate based on Faraday’s Law of Electromagnetic Induction, adopting a mature two-stage brushless excitation and closed-loop automatic voltage regulation system. Different from conventional brushed alternators, its contact-free excitation structure avoids mechanical friction and electric spark interference, ensuring stable operation under harsh dynamic working conditions.
During equipment startup, the residual magnetism of the rotor pole induces initial voltage in the stator auxiliary winding. The built-in high-precision voltage regulator detects real-time voltage changes and outputs adjustable DC excitation current to the exciter stator, forming a stable fixed magnetic field. Driven by the engine shaft, the coaxial exciter rotor rotates at high speed and cuts magnetic flux lines to generate intermediate-frequency alternating current. The integrated rotating rectifier module converts AC into pure DC excitation current and transmits it to the main rotor field winding.
The energized main rotor generates a rotating magnetic field, enabling the main stator winding to induce standard sinusoidal AC power. Equipped with optimized load adaptive logic, Delco Remy alternators maintain stable voltage output at low idle speed and high-speed operation. The built-in RFI suppression design effectively reduces electromagnetic interference, ensuring clean power output and strong operational stability during frequent load changes and long-term heavy-duty operation.
3. Main Structural Components
Delco Remy brushless AC alternators adopt compact integrated coaxial layout and modular industrial structure, with all components optimized for heavy-duty working conditions. The whole machine features high structural rigidity, excellent heat dissipation and corrosion resistance. The core components include main generator unit, brushless exciter assembly, high-efficiency rotating rectifier, intelligent voltage regulator and fully encapsulated protective structure.
3.1 Main Generator Unit
As the core power generation part, it consists of a high-rigidity stator and a dynamically balanced rotor. The stator adopts high-purity copper windings and high-density laminated silicon steel sheets, which effectively reduce eddy current loss and improve power generation efficiency. The rotor undergoes precision dynamic balance calibration to minimize vibration during high-speed operation. Multiple mainstream series are configured with different power specifications, adapting to low-speed idle power generation and high-speed continuous operation. Some high-end models support a maximum continuous speed of 10,000 RPM and intermittent speed up to 12,000 RPM, meeting extreme operating speed requirements of heavy equipment.
3.2 Brushless Exciter Unit
The dedicated brushless excitation assembly completely cancels carbon brushes and slip rings, realizing zero-wear excitation operation. The fixed exciter stator receives adjustable DC current to form a stable magnetic field, while the synchronous rotating exciter rotor generates intermediate-frequency excitation power. This structure eliminates carbon dust accumulation, contact failure and electric spark risks, greatly improving equipment reliability in dusty, humid and flammable working environments.
3.3 Rotating Rectifier Module
Installed on the rotor shaft and rotating synchronously, the industrial-grade rectifier module is composed of high-current high-temperature resistant diodes and protective components. It efficiently converts intermediate-frequency AC power into stable DC excitation current, with fast heat dissipation and strong overcurrent resistance. It can adapt to frequent load switching and long-term high-load operation, ensuring continuous and stable excitation output without failure.
3.4 Intelligent Voltage Regulator
The built-in high-precision regulator realizes real-time closed-loop voltage regulation, maintaining stable output voltage within the rated range under variable speed and variable load conditions. Optional remote sensing function compensates line voltage drop, further improving power supply accuracy. Meanwhile, it integrates overvoltage, undervoltage and overcurrent protection functions, effectively avoiding equipment damage caused by abnormal power supply and improving overall operational safety.
3.5 Encapsulated Protective Structure
All electronic components are specially coated and fully encapsulated, with excellent dustproof, salt fog corrosion resistance and moisture resistance. The high-temperature resistant structure supports a working temperature rating up to 125°C, adapting to extreme temperature environments of construction sites, road operation and field work.
4. Main Product Classification and Specifications
Delco Remy brushless alternators are dominated by SI series heavy-duty models, covering multiple power grades to meet diverse heavy-load power supply demands:
4.1 34SI Medium-Duty Brushless Alternator
It is a classic medium-power model, suitable for general heavy-duty equipment. It provides 110A/135A output at 12V and 75A/100A output at 24V. Featuring low turn-on speed, low parasitic loss and excellent RFI suppression performance, it is widely used for light and medium commercial vehicles and general industrial equipment.
4.2 36SI High-Efficiency Brushless Alternator
As an upgraded high-stability model, it reaches 170A high output at 12V (100A stable output at idle speed) and 105A output at 24V. It supports forward and reverse rotation mounting, with a maximum continuous speed of 10,000 RPM. With optional remote sensing function and high-temperature resistance design, it is suitable for medium and large heavy-duty machinery and engineering vehicles.
4.3 55SI Ultra-High Output Brushless Alternator
It is Delco Remy’s high-end high-power flagship model, with industry-leading power density. It achieves 430A maximum output at 12V and 275A high output at 24V. It supports 8,000 RPM continuous operation and 9,000 RPM intermittent operation. With ultra-high power generation efficiency and strong instantaneous load capacity, it is specially designed for large heavy-duty trucks, mining equipment and high-power industrial mobile devices.
5. Core Advantages
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Genuine Brushless Maintenance-Free Design: Eliminate wearable carbon brushes and slip rings, completely avoiding brush wear, carbon dust accumulation and contact failure. It greatly extends service intervals, reduces unplanned downtime and cuts long-term maintenance costs.
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Superior Heavy-Duty Adaptability: High structural rigidity and dynamic balance design deliver excellent vibration resistance. Fully encapsulated anti-corrosion coating resists dust, road salt, moisture and high temperature, adapting to harsh construction, mining and field operation environments.
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Low Speed High Output Performance: Optimized electromagnetic structure ensures stable high-current output at idle speed, solving the problem of insufficient power supply for equipment under low-speed operation and improving the overall power supply stability of heavy equipment.
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Low Electromagnetic Interference: Built-in professional RFI suppression system effectively reduces radio frequency interference, ensuring no signal interference for vehicle communication, precision instruments and electronic control systems.
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High Power Density and Efficiency: Compact structural design achieves ultra-high output current with small volume. Optimized magnetic circuit and winding technology improve power generation efficiency, reducing engine load and energy consumption.
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Complete Protection Mechanism: Integrated overvoltage, undervoltage, overcurrent and high-temperature protection functions, with optional remote voltage sensing, ensuring safe and stable operation under complex and variable working conditions.
6. Main Applications
Delco Remy brushless AC alternators are specialized heavy-duty power generation equipment, focusing on mobile and harsh working condition scenarios. They are widely applied in heavy-duty trucks, semi-trailers and commercial vehicle electrical systems to provide stable charging and power support for vehicle batteries and electrical equipment. In the field of engineering and construction machinery, they serve core power components for excavators, loaders, cranes and road machinery, adapting to high-vibration and dusty construction environments. In agricultural and mining industries, they support long-term continuous operation of farm machinery and mining equipment under field extreme conditions. In addition, they are also used for stationary industrial auxiliary power supply and special vehicle emergency power systems, becoming the preferred power generation equipment for global heavy-duty mobile machinery.
7. Conclusion
With decades of professional heavy-duty electrical equipment manufacturing experience, Delco Remy brushless AC alternators rely on mature brushless excitation technology, ultra-high output performance and industrial-grade durability to form unique product advantages. Compared with ordinary civilian alternators, they have stronger vibration resistance, higher temperature adaptability and lower failure rate, fully matching the severe working conditions of heavy equipment. Relying on diversified SI series product lines and excellent comprehensive performance, they occupy a leading position in the global heavy-duty alternator market, providing reliable, efficient and low-maintenance power guarantee for commercial vehicles, engineering machinery and industrial heavy-load equipment.
Applications List
Voltage
24
Amperage
70
Free wheel pulley
CW
Replaces These Part Numbers
2874863 A1052S 4936880 Alternator 287486300 UD15124A UD19966A Battery charger 116317 F032116317 4993344 3972735 4936879 5282841
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价格范围：$100.00 至 $220.00
