Rotary Variable Differential Transformer
Overview
We are recognized as a leader in variable differential transformer design and fabrication. The solution provides alternating current (AC) output voltage directly proportional to the angular displacement of its input shaft; installed on every active Boeing commercial platform. We have provided rotary variable differential transformer (RVDT) based position sensors for aerospace applications for over 30 years.
Compatible Aircraft
Boeing Commercial Platforms
Specifications
Key Differentiators
- Features & Benefits
- Additional linear range can be added through multiple sensor arrays
- Compatible for Battery Powered Applications
- Low Noise Passive Element Design
- No indexing with exact position known
- RoHS Compatible and suitable for High Speed SMT Assembly
- ±45° with <0.07° resolution (HMC1501)
- ±90° with <0.05° resolution (HMC1512)
- Key Savings
- Designed for High Volume, Cost Effective OEM Designs
Performance Data
- Features
- 4-Element Wheatstone Bridges
- Absolute Sensing
- Available in Tape & Reel Packaging
- Available in Tape and Reel Packaging
- Effective Linear Range
- Surface Mount Sensors
- Wide Angular Range
- Operating Temperature
- -40°C to +125°C (Ambient) (HMC1501 and HMC1512)
- Bridge Offset Tempco
- ±100 ppm/°C (Typical) (TA = -40°C to +125°C) (HMC1501 and HMC1512)
- Storage Temperature
- -55°C to +150°C (Ambient, unbiased) (HMC1501 and HMC1512)
- Bridge Ohmic Tempco
- 2800 ppm/°C (Typical) (Vb=5 volts, TA = -40 °C to +125°C) (HMC1501 and HMC1512)
- Sensitivity Tempco
- -3200 ppm/°C (Typical) (Vb=5 volts, TA = -40°C to +125°C) (HMC1501 and HMC1512)
- Hysteresis Error
- 0.017° (Typical) (Field > 80 Oe, Vb=5 volts) (HMC1501 and HMC1512)
- 30 µV (Typical) (Field > 80 Oe, Vb=5 volts) (HMC1501 and HMC1512)
- Sustainability
- Low Voltage Operations (2.0V)
- Supply Voltage
- 1.0 - 25 Volts (Vbridge (Vb) referenced to GND) (HMC1501) voltage alternating current
- 1.0 - 25 Volts (Vbridge (Vb) referenced to GND) (HMC1512) voltage alternating current
- 5.0 Volts (Typical) (Vbridge (Vb) referenced to GND) (HMC1501) voltage alternating current
- 5.0 Volts (Typical) (Vbridge (Vb) referenced to GND) (HMC1512) voltage alternating current
- Output Voltage
- 100 - 140 mVpp (Vb=5 volts, field=80 Oe) (HMC1501)
- 100 - 140 mVpp (Vb=5 volts, field=80 Oe) (HMC1512)
- 120 mVpp (Typical) (Vb=5 volts, field=80 Oe) (HMC1501)
- 120 mVpp (Typical) (Vb=5 volts, field=80 Oe) (HMC1512)
- Noise Density
- 100 nV/sqrt Hz (Typical) (@1Hz, Vb=5 volts) (HMC1501)
- 70 nV/sqrt Hz (Typical) (@1Hz, Vb=5 volts) (HMC1512)
- Bridge Offset
- 0 mV/V (Typical) (field=80 Oe) (HMC1512 Bridge A)
- 0 mV/V (Typical) (field=80 Oe) (HMC1512 Bridge B)
- 3 mV/V (Typical) (field=80 Oe) (HMC1501)
- ±7 mV/V (field=80 Oe) (HMC1501)
- ±7 mV/V (field=80 Oe) (HMC1512 Bridge A)
- ±7 mV/V (field=80 Oe) (HMC1512 Bridge B)
- Linear Range
- >8mm when two sensors are mounted on two ends
- Additional range can be added through multiple sensor arrays
- Applications
- Non-contact precision location measurement systems
- Position Sensing
- Rotary speed and angle detection
- Sensitivity
- 1.8 mV/° (Typical) (Vb=5 volts, field=80Oe @ zero crossing averaged in a 45° range) (HMC1501) Percentage
- 1.8 mV/° (Typical) (Vb=5 volts, field=80Oe @ zero crossing averaged in a 45° range) (HMC1512) Percentage
- 2.1 mV/° (Typical) (Vb=5 volts, field=80Oe @ zero crossing range) (HMC1501) Percentage
- 2.1 mV/° (Typical) (Vb=5 volts, field=80Oe @ zero crossing range) (HMC1512) Percentage
- Angle Range
- ±45° (>Saturation Field) (HMC1501)
- ±90° (>Saturation Field) (HMC1512)
- Resolution
- 0.05° (Typical) (BW=10Hz, Vb=5 volts) (HMC1512) pixel
- 0.07° (Typical) (BW=10Hz, Vb=5 volts) (HMC1501) pixel
- Resistance
- 2000 - 2800 ohms (Bridge current = 1mA) (HMC1512) ohm
- 2100 ohms (Typical) (Bridge current = 1mA) (HMC1512) ohm
- 4000 - 6500 ohms (Bridge current = 1mA) (HMC1501) ohm
- 5000 ohms (Typical) (Bridge current = 1mA) (HMC1501) ohm
- Humidity
- 85% (Tested at 85°C) (HMC1501 and HMC1512)
