Electric Power Steering Pump For Electric Bus

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Electric Power Steering Pump for Electric Bus

 

 

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

 

 

 

 

 

Dual-source steering motors (mainly dual-winding permanent magnet synchronous motors) are redundant and safe core components of the power steering system in new energy vehicles. The motor stator encapsulates two sets of electrically completely isolated and physically independent windings: a high-voltage main winding and a low-voltage emergency winding, which share the same rotor output shaft. They are equipped with two independent controllers and two independent power supplies, and often integrate a hydraulic vane pump to form a dual-source electric hydraulic steering pump assembly (mainstream in commercial vehicles). Passenger vehicles with steer-by-wire systems mostly adopt dual-source EPS motor solutions.

 

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℃

 

 

 

 

1. Normal Driving Conditions (High-Voltage Main Circuit Operation)

After the vehicle is powered on, the high-voltage power battery → high-voltage controller → high-voltage winding drive motor operates at full speed, driving the oil pump/steering reducer to output sufficient steering assist, meeting the high power demands of heavy loads, high speeds, and full steering wheel rotation while stationary.

The low-voltage circuit remains in standby monitoring mode throughout. The low-voltage controller collects real-time operating data from the high-voltage circuit, without outputting power or consuming additional power, resulting in optimal system efficiency.

 

 

2. Winding Physical Characteristics

Both sets of windings are wound on the same stator core, but the slots, connections, and grounding are completely isolated, preventing the problem of one set failing and the other set breaking down; the shared rotor ensures that the output torque is coaxial and synchronized, and there is no obvious jerking in the steering feel during the switching process.

 

 

 

Highest Level of Steering Safety Redundancy:

Solves the fatal hidden danger of steering failure after a high-voltage power outage in pure electric vehicles, a mandatory safety feature for commercial vehicles and essential hardware for advanced autonomous driving steer-by-wire systems;

Cost and Size Optimization:

The single-motor dual-winding scheme is smaller, simpler to arrange, and lower in cost compared to the dual-motor redundancy scheme with two independent steering motors;

Low Energy Consumption Design:

Normally, only high voltage is used for operation, with low voltage only as a backup, preventing both windings from consuming power simultaneously for extended periods;

Multiple Protections:

The controller has built-in overcurrent, overheat, undervoltage, short circuit, and insulation monitoring and protection;

Adaptable to All Working Conditions:

High-voltage, high-power operation handles heavy-load steering, while low-voltage, low-power operation meets emergency avoidance needs.

 

 

Passenger Buses

 

New Energy Heavy Trucks / Tractors / Dump Trucks

 

 

 

 

 

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