Frameless Resolvers

Harowe frameless resolvers provide absolute feedback for brushless motors, robots and direct drive motors in precision rotary platforms and servo applications. These motor resolvers can operate in high shock and vibration, high temperature (up to 200°C) and are resistant to noise and contamination. Options include multiple speeds, radiation hardened, flux shielding technology and stainless steel housing. Frameless resolvers are available in sizes as small as size 10 (1.0 inch OD) and as large as size 55 (5.5 inch OD). HaroMax motor resolvers are available in size 15 and 21 and offer high accuracy up to 5 arcmin.

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Featured Frameless Resolvers

Size 10 Motor Resolver

Size 10 brushless resolver, super compact size, bore sizes of 4mm, 6mm or 1/4" and single speed accuracy of 15 arcmin max

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Size 15 Motor Resolver

Size 15 brushless resolver offers multiple speeds up to 4X, bore sizes of 8mm - 12mm or 1/4 - 3/8" and single speed accuracy of 7 arcmin max

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Size 21 Motor Resolver

Size 21 brushless resolver, multiple speeds up to 4X, max bore size of 0.8" and single speed accuracy of 2 arcmin max

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Size 31 Motor Resolver

Size 31 brushless resolver, multiple speeds, max bore size 1.56" and single speed accuracy of 10 arcmin max

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Size 55 Motor Resolver

Size 55 brushless resolver, multiples speeds up to 32X, max bore size of 3.65" and single speed accuracy of 4 arcmin max

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HaroMax Frameless Resolvers

HaroMax Size 15 Servo Resolver

Size 15 brushless resolver offers high accuracy within 16 arcmin, low mass anodized aluminum housing, max bore size of 3/8"

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HaroMax Size 21 Servo Resolver

Size 21 brushless resolver offers high accuracy within 16 arcmin, low mass anodized aluminum housing, max bore size of 0.8"

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Frequently Asked Questions about Frameless Resolvers

What are the types of resolver?

Resolvers differ by 2 major attributes: housing design and winding configurations. Resolvers can be housed within a body or frameless in design. Resolvers come in various winding configurations with the number of speeds or poles and input excitation differing based on the winding design.

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What is a frameless resolver?

Unlike a housed resolver, in a frameless resolver the stator and rotor are not contained within a single housing. A frameless resolver can be mounted directly to the shaft of the motor or rotating load because it is in two separate parts allow for more flexible mounting options and potential reduction in overall space, when compared to the use of couplings or tethers.

How to mount a frameless resolver?

When mounting a frameless resolver, the rotor and stator must be properly aligned to achieve electromagnetic interaction, essential to accurate position reporting. Mount the rotor using an industrial grade glue. Alternatively, a jamnut can be used to hold the rotor in place. Mount the stator with either an o-ring or servo clips for the servo-style stator housings or mounting screws for the flanged-type housings.

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What is the difference between a resolver and an encoder?

A resolver provides an analog signal typically consisting of sin & cos output signals for position measurement. An encoder (depending on type) provides digital pulses or a digital word to represent the position measurement. While a resolver is often less expensive than an encoder, the analog output requires additional electronics on the receiving side to digitalize the signal.

Frameless Resolvers