TDK HAL 3025: Precise Position Detection at High Rotational Speeds Interference-Resistant Fast-Hall Position Sensor for Safety-Critical Motor Control Systems

Offering more flexibility in motor design, the HAL 3025 uses SixSense technology to detect the vertical components of the magnetic field and determine the full 360° rotation angle. Its interference field compensation, in accordance with ISO 11452-8, reduces the influence of external magnetic fields. This allows the power electronics to be placed closer to the sensor. Additional magnetic shielding or oversized target magnets are not required. A simple two-pole ferrite magnet in an end-of-shaft configuration is sufficient. This facilitates compact motor designs and can reduce both component and system costs.

For safety-critical applications, the sensor features a single-chip fail-safe architecture. Integrated diagnostic functions detect errors directly within the IC, reducing the need for external monitoring by the motor controller. Compared to multi-chip solutions, this reduces system complexity, the number of components and the space required on the printed circuit board.

The fast analogue signal path enables short response times and a high output bandwidth. Microcontrollers or ECUs can calculate the absolute angular position with high resolution via differential or single-ended sine/cosine outputs. Signal parameters such as gain, offset, orthogonality, zero angle, 

and magnetic bandwidth can be programmed via the output pin. No additional programming pins are required. Pin compatibility with the HAL 3020 and HAL 3021 also facilitates upgrades to existing designs.

Key features and benefits:

• 360° angle measurement at speeds of up to 60,000 rpm
• Magnetic interference compensation in accordance with ISO 11452-8:2015
• SEooC ASIL D-ready in accordance with ISO 26262:2018
• Integrated on-chip diagnostics
• EMC-robust differential or single-ended sine/cosine analogue outputs
• Operating temperature range of -40 °C to +150 °C
• Programmable signal processing for gain, offset, zero angle and orthogonality
• Overvoltage and reverse polarity protection
• Compact SOIC8 SMD package

Applications:

Rotary position measurement for commutation of:

- Brushless DC motors (BLDC)

- Permanent magnet synchronous motors (PMSM)

- Induction motors (ASM)

Steer-by-wire systems:

· Rack-and-pinion actuators

· Steering wheel actuators

· Steering angle position

Brake-by-wire systems:

· Electrohydraulic brake actuators

· Electromechanical brake actuators

Other applications:

· HV traction motors

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