Electric Power Steering System
NFEHPS-1525R538CBJJNF02
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.
Quantity:
The steering pump is the power source of the hydraulic power steering system, commonly known as the power steering pump. Its function is to provide high-pressure hydraulic oil to the steering gear, reducing the amount of effort required for the driver to turn the steering wheel. It is widely used in passenger cars, commercial vehicles, and construction machinery.
| 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 | ||
Working Principle
When the driver turns the steering wheel, torque and steering angle sensors collect signals, and the vehicle's CAN bus provides the vehicle speed signal, which is then transmitted to the E-HPS controller.
The ECU calculates the required power steering flow and pressure based on the vehicle speed and steering torque: Low speed/Standing: The motor operates at high speed, outputting a large flow, resulting in light steering; High speed: The motor speed decreases, reducing power steering, making the steering wheel heavier and improving driving stability; Straight driving with almost no steering: The motor operates at low speed in standby mode, consuming almost no power (power supplied on demand).
