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.
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
Angle Range
- ±45° (>Saturation Field) (HMC1501)
- ±90° (>Saturation Field) (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
Storage Temperature
- -55°C to +150°C (Ambient, unbiased) (HMC1501 and HMC1512)
Sensitivity Tempco
- -3200 ppm/°C (Typical) (Vb=5 volts, TA = -40°C to +125°C) (HMC1501 and HMC1512)
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
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
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)
Operating Temperature
- -40°C to +125°C (Ambient) (HMC1501 and HMC1512)
Noise Density
- 100 nV/sqrt Hz (Typical) (@1Hz, Vb=5 volts) (HMC1501)
- 70 nV/sqrt Hz (Typical) (@1Hz, Vb=5 volts) (HMC1512)
Linear Range
- >8mm when two sensors are mounted on two ends
- Additional range can be added through multiple sensor arrays
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)
Humidity
- 85% (Tested at 85°C) (HMC1501 and HMC1512)
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
Bridge Ohmic Tempco
- 2800 ppm/°C (Typical) (Vb=5 volts, TA = -40 °C to +125°C) (HMC1501 and HMC1512)
Bridge Offset Tempco
- ±100 ppm/°C (Typical) (TA = -40°C to +125°C) (HMC1501 and 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)
Applications
- Non-contact precision location measurement systems
- Position Sensing
- Rotary speed and angle detection
Compatible Platform
- Boeing Commercial Platforms
