Harowe Resolvers®
Offer unlimited resolution, inherent noise protection, and no onboard
processors. Resolvers provide a robust, high-performance solution
for a range of demanding applications.
A resolver is an analog electromagnetic transducer that can be used in a wide variety
of position and velocity feedback applications ranging from semiconductor manufacturing to
oil and gas drilling, from beverage packaging to radiation treatment. Because the resolver is
an analog device and the electrical outputs are continuous through one complete mechanical
revolution, the devices offer infinite theoretical resolution. With its simple transformer design
and lack of any on board electronics, the resolver is much more rugged than almost any other
type of feedback device, making it the natural choice for harsh environments involving temperature
extremes, high shock and vibration, elevated radiation levels, and contaminants such as dirt, grease,
and oil. Whether the application is in a steel mill, a jet engine, or a punch press, a resolver can do the job.
Features: Wide Operating Temperature Range, Excellent Environmental Resistance, High Reliability,
Absolute Value Position Detection, High Resistance to Noise, Rotatable at High Speeds, Compact Assembly
Basic Resolver Principles:
When the primary and secondary iron cores are positioned at 0° relative to each other.
Primary Coil
Current
Input Signal Line 1
The magnetic flux from the primary
iron core reaches the secondary
iron core even if there are gaps.
Flux
Flux
Input Voltage
Input Signal Line 2
Flux
Flux
Secondary Iron Core
Secondary Coil
Output Signal Line 1
Output Voltage=
In-Phase, High
Output Signal Line 2
Primary
Iron Core
Primary
Coil
Input
Signal
Line 2
Input
Signal
Line 1
Output Signal
Line 2
Output
Signal
Line 1
Secondary
Coil
Secondary
Iron Core
Input Voltage
Input/Output Voltage
Input Output
Voltage =
In-Phase,
High
Voltage
Primary Iron Core
Time
When the primary and secondary iron cores are positioned at 45° relative to each other.
Primary Coil
Current
Input Signal Line 1
Input Voltage
Input Signal Line 2
The magnetic flux from the
primary iron core does not reach
the secondary iron core.
Flux Flux
Flux
Flux
Flux
Secondary Iron Core
Secondary Coil
Output Signal Line 1
Output Voltage=
In-Phase, Low
Output Signal Line 2
Primary
Iron Core
Primary
Coil
Input
Signal
Line 1
Input
Signal
Line 2
Output
Signal Line 2
Output
Signal
Line 1
Secondary
Coil
Secondary
Iron Core
Input Voltage
Input/Output Voltage
Input Output
Voltage =
In-Phase,
Low
Voltage
Primary Iron Core
Time
When the primary and secondary iron cores are positioned at 135° relative to each other.
Primary Coil
Current
Input Signal Line 2
Input Voltage
Input Signal Line 1
Flux
Flux
Flux
Flux Flux
Secondary Iron Core
Secondary Coil
Output Signal Line 1
Output Voltage=
Reverse-Phase, Low
Output Signal Line 2
Output
Signal Line 2
Output
Signal
Line 1
Primary
Iron Core
Primary
Coil
Input
Signal
Line 1
Input
Signal
Line 2
Secondary
Coil
Secondary
Iron Core
Input Voltage
Input/Output Voltage
Input Output
Voltage =
ReversePhase,
Low
Voltage
Primary Iron Core
Time
When the primary and secondary iron cores are positioned at 180° relative to each other.
Primary Coil
Current
Input Signal Line 2
Flux
Flux
Flux
Flux
Input Voltage
Input Signal Line 1
Secondary Iron Core
Secondary Coil
Output Signal Line 1
Output Voltage=
Reverse-Phase, High
Output Signal Line 2
Primary
Iron Core
Primary
Coil
Input
Signal
Line 1
Input
Signal
Line 2
Output
Signal Line 2
Output
Signal
Line 1
Secondary
Coil
Secondary
Iron Core
Input Voltage
Input/Output Voltage
Input Output
Voltage =
ReversePhase,
High
Voltage
Primary Iron Core
Time
716.652.3600 • email: Resolver@delevan.com
www.delevan.com
Harowe Resolvers®
Offer unlimited resolution, inherent noise protection, and no onboard
processors. Resolvers provide a robust, high-performance solution
for a range of demanding applications.
A single-speed resolver features two magnetic poles. The windings for a single-speed resolver
are wound such that a plot of output voltage as a function of position for the device produces
one complete cycle of a sine wave and one complete cycle of a cosine wave over each 360°
mechanical rotation of the shaft. As a result, a single-speed (two-pole) resolver can provide
absolute position feedback.
A multi-speed resolver is wound to produce multiple magnetic poles, which means that it
generates multiple sine and cosine curves per mechanical revolution. A 3-speed resolver, for example,
produces one sine/cosine wave cycle for each 120° of shaft rotation. As a result, it provides better accuracy;
the higher the number of poles, the higher the accuracy.
Basic Resolver Types:
Resolver Transmitter (Stator Secondary)
Resolver Receiver (Rotor Secondary)
Resolver Differential (2 Primary Windings)
(Synchro equivalents available)
Comparison of Angle Sensors:
■ Excellent
● Good
▲ Poor
Harowe® Multi-Speed
Resolvers
Optical Incremental
Encoder
Optical Absolute
Encoder
Hall Effect
Sensor
MR
Sensor
Accuracy
■
■
■
▲
▲
Resolution
∞
10,000 PPR
222 cpr
Up to 500 PPR
Up to 4000 PPR
Output
Signals
Absolute Angle
Incremental
Absolute
Incremental
Incremental
Shock
■
▲
▲
●
●
Vibration
■
▲
▲
●
●
Heat
Resistance
Up to 200°C
-10°C to +85°C
-10°C to +85°C
-10°C to +110°C
-10°C to +85°C
Reliability
■
●
●
▲
●
Anti-Noise
■
●
●
▲
▲
Features
Absolute Position
Detection,
High Reliability,
Excellent
Environmental
Resistance
High Resolution,
Poor Reliability
High Resolution,
Poor Reliability
Low Resolution
Low Resolution
(Arc-Min)
■
▲
▲
▲
▲
Heavy Duty Brushless Resolvers
Harowe's frameless resolvers generate speeds and position data for robotic, machine tool and aerospace servo applications,
as well as commutating brushless servo motors. The frameless construction simplifies mounting mechanics because the
rotor mounts directly onto the motor shaft and the stator housing mounts directly onto the motor end bell.
• Wide Range of Sizes from 10 to 55 • Multi-Speed Available • Up to 200ºC Temperature Range
• Radiation-Hardened Models Available
Heavy Duty Housed Resolvers
Harowe's heavy duty housed resolvers provide a very tough package to withstand extreme abuse. Made of aluminum and/or steel
with high integrity, static or dynamic seals, they are capable of measuring rotary motion with the accuracy of many delicate encoders.
• Rugged Housing with IP65 Rating • Spaced Bearings for up to 10x the Life of Traditional Duplex Bearings
• Withstands 200g Shock and 40g Vibration
ACC #2-0715
716.652.3600 • email: Resolver@delevan.com
www.delevan.com