F15
Servo Duty Encoder for Stepper & Small Servo Motors
The Dynapar Series F15 is a digital commutating encoder designed for stepper and small servo motor applications. Its flex servo-ring mounting arrangement is designed to provide an easy replacement for a Size 15 resolver, while its compact mounting depth simplifies installation.
Key Features
- Digital encoder with flex servo ring, providing an easy replacement for a Size 15 resolver
- Short 0.88 in mounting depth with jam-nut shaft fixing for easier installation.
- ±2.5 arc-min maximum incremental accuracy.
STANDARD OPERATING CHARACTERISTICS
Encoder Type
The Series F15 uses an optical incremental encoder with an optional commutation function.
Resolution
For incremental operation:
- 1024 PPR
- 2048 PPR
Commutation channels are available for:
- 6-pole motors
- 8-pole motors
Accuracy
Incremental: ±2.5 arc-min maximum, edge to any edge.
Commutation: ±6 arc-min maximum.
Signal Phasing
For CCW rotation of the motor shaft:
- A leads B by 90°
- U leads V leads W by 120°
The minimum separation between the A and B edges is 45°.
Index-to-U Channel
Index Pulse Width
The index pulse is 90° gated with A and B high.
ELECTRICAL SPECIFICATIONS
Input Power
The encoder requires:
5 VDC ±10%
Maximum current consumption is 100 mA for incremental and commutation operation, excluding the output load.
Output Signals
Incremental output:
- 26LC31 differential line driver
- Maximum sink/source current: 40 mA
Commutation output:
Two output configurations are available:
- Open collector with 2.0 kΩ pull-ups, maximum sink current 8 mA
- 26LC31 differential line driver, maximum sink/source current 40 mA
Frequency Response
Maximum frequency response: 300 kHz.
Termination
- The encoder uses flying leads consisting of:
- 26 AWG stranded wire
- Twisted-pair construction
- PVC insulation
- Cable length: 6.5 in ±0.5 in
MECHANICAL SPECIFICATIONS
Bore Diameter
0.375 in (9.53 mm)
Bore Diameter Tolerance
- +0.001 / -0.000 in
- (+0.025 / -0.000 mm)
Overall Dimensions
- Outside diameter: 1.45 in (36.8 mm) maximum
- Height: 0.87 in (22.1 mm) maximum
Mating Shaft Runout
Maximum 0.002 in (0.05 mm), including shaft perpendicularity to the mounting surface.
Mating Shaft Axial Movement
Maximum ±0.010 in (±0.25 mm).
Mounting
The Series F15 uses a 1.435 in (36.45 mm) servo ring with an integral flexure. This mounting arrangement corresponds to the Size 15 pancake resolver equivalent configuration.
Maximum Acceleration
100,000 rad/sec² maximum.
Speed
Continuous speed: 5,000 RPM
Peak speed: 12,000 RPM
Moment of Inertia
3.59 × 10⁻⁵ in-oz-sec²
(2.5 gm-cm²)
Housing and Component Materials
- Housing: Cast aluminum
- Servo ring: Glass-reinforced engineering resin
- Hub: Brass
- Disc: 0.030 in (0.76 mm) thick glass
Weight
Typical weight: 1.6 oz (45 gm).
Servo Ring
The servo-ring mounting system incorporates an integral flexure and is designed as a Size 15 pancake resolver equivalent.
