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Tel: +86 010 58673556
Candy Jiao
E-mail: nh.jiao@auto-parkingheater.com
Email: nh.li@auto-parkingheater.com
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Electro Hydraulic Power Steering Pump Assemby
The dual power source electric steering motor is a high-safety redundant steering assembly specially developed for new energy commercial vehicles including electric buses, heavy-duty trucks and sanitation vehicles. It adopts a dual-winding permanent magnet synchronous motor integrated with a hydraulic vane pump, equipped with independent high-voltage and low-voltage control systems to solve the safety hazard of complete loss of steering assist caused by high-voltage power failure of the vehicle.
Description
If you're looking for the electro hydraulic power steering pump assemby, welcome to wholesale the product from our factory. As one of the leading manufacturers and suppliers in China, we will offer you the best service and fast delivery. Now, check the quotation with our seller.
Electro Hydraulic Power Steering Pump Assembly
Products Description
The electric motor pump EHPS is a combination of "drive motor + steering hydraulic power pump". It is driven by a motor instead of a traditional engine. It provides steering hydraulic pressure for hybrid buses and electric buses. It is the power source and core component of the steering system.
Driven by a fully enclosed and high-efficiency permanent magnet synchronous motor, the steering pump improves sealing and reliability;
The use of smooth, impact-proof flexible couplings for power transmission greatly improves the service life;
The overall protection level reaches IP67 and adopts double insulation design to ensure that there is no conduction between the motor and the oil pump;
The motor housing and steering pump housing are all made of aluminum alloy, which has excellent properties such as low noise, light weight and fast heat dissipation.
| High voltage module motor parameters (controller 400-700VDC) | |||
| Motor & Controller Model | EHPS-38CBJJNF01-010 | ||
| Motor Rated Voltage (VAC) | 380 | Temperature Control Resistor Type | None |
| Rated Power (kW) | 5 | Rated Speed (r/min) | 1500 |
| Maximum Output Power (kW) | 10 | Rated Frequency (Hz) | 100 |
| Induced Voltage at Rated Speed (VAC) | 286.1 | Number of Motor Poles | 8 poles (4 pairs of poles) |
| Rated Phase Current (A) | 11 | Line Resistance (Ω) (at 20°C) | 1.45 |
| Peak Phase Current (A) | 23 | Duty Cycle | S2-3min |
| D-Axis Inductance (mH) | 8.035 | Rated Efficiency (%) | ≥92% |
| Q-Axis Inductance (mH) | 22.08 | Insulation Grade | Class H |
| Rated Torque (Nm) | 31.83 | Protection Grade | IP68 |
| Peak Torque (Nm) | 63.7 | Cooling Method | Natural cooling |
| Speed Range (r/min) | 600-1800 | Ambient Operating Temperature | -40~+85℃ |
| Motor Type | SVC sensorless permanent magnet synchronous motor | ||
| Low voltage module motor parameters (24VDC) | |||
| Peak Power (kW) | 2.5 | Rated speed (r/min) | 1200 |
| Inductive Current at Rated Speed (VAC) | 14.25 | Rated frequency (Hz) | 80 |
| Peak Phase Current (A) | 145 | Number of motor poles | 8 poles (4 pairs of poles) |
| D-Axis Inductance (mH) | 0.03877 | Wire resistance (Ω) | 23 |
| Q-Axis Inductance (mH) | 0.09948 | Duty cycle | S2-3min |
| Peak Torque (Nm) | 23.8 | Ambient operating temperature | -40~+85℃ |
| Motor Type | Permanent magnet synchronous | ||
| 24V EPS motor controller technical parameters | ||
| Item | Parameters | Notes |
| Peak Power (kW) | 2.5 | |
| Peak Output Current (A) | 150 | Good ventilation |
| Peak Current Operating Time (s) | 60 | Good ventilation |
| Carrier Frequency (Hz) | Maximum 10K | |
| Control Power Supply Input Voltage Range (V) | 9-36 | |
| Power Supply Input Voltage Range (V) | 16-32 | |
| Rated Voltage (V) | 24 | |
| Output Frequency (Hz) | 0-250 | |
| Cooling Method | Natural cooling | |
| IP Rating | IP68 | |
| Storage Temperature | -40~+85℃ | |
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Product safety requirements
1. The steering design meets the requirements of Clause 3.9 of GB17675-1999 "Basic Requirements for Automotive Steering Systems," stably requiring a maneuvering time of no more than 4 seconds under normal conditions and no more than 6 seconds when power steering fails.
2. The steering design meets the relevant power supply requirements of Clause 4.5.2 of BMGZ-307-01 "Safety Technical Conditions for Electric Buses." Specifically, in the event of an abnormal situation requiring the disconnection of Class B high-voltage power to the entire vehicle during operation, the steering system should maintain power steering or at least maintain power steering for 30 seconds at speeds greater than 5 km/h.
Principle Summary: A dual-system approach is adopted to provide power steering. During vehicle use, if any component in the high-voltage system malfunctions, emergency steering can be achieved through the low-voltage system, greatly enhancing the safety of the steering system. High-low voltage switching is millisecond-level, with no noticeable lag or hesitation in the feel, resulting in a comfortable and smooth switching process without any rebound.
Products Detail pictures
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Products Application
Passenger Buses
Vehicle Types: 6-18 meter pure electric city buses, tourist buses, commuter buses, airport shuttle buses
Operating Pain Points: Frequent start-stop cycles, low-speed turning in place, power battery contactor failure, high-voltage power loss due to collisions, charging interruptions; steering must be guaranteed to remain functional.
New Energy Heavy Trucks / Tractors / Dump Trucks
Vehicle Types: Pure electric dump trucks, tractor semi-trailers, mixer trucks, mining trucks, hydrogen-powered heavy trucks
Reasons for Suitability: Complex high-voltage circuits, significant vibration and bumps, high-voltage insulation prone to failure; fully loaded weight 30-80 tons; without power steering, steering becomes completely impossible, posing a significant safety risk.
Special Matching: Low-voltage battery capacity ≥180Ah, equipped with a low-voltage stabilizing and anti-reverse charging module to prevent high-voltage winding-induced voltage from damaging low-voltage electrical components.
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