AC Motors with Intelligence

The Reliance Cool Muscle Motor – A complete motion control solution

The Reliance Cool Muscle Motor

This cost-effective miniature servo system combines a precision stepper motor and high resolution encoder with sophisticated drive and control electronics in a single, compact unit.

  – NEMA sizes 11, 17 and 23 each with two frame lengths

  – Encoder resolution of 50,000 counts per revolution

  – Speeds from 0 to 3,000 RPM

  – Continuous torques from 0.027 to 0.87 Nm (1.24 Nm peak)

  – H-infinity controller and vector drive for fully closed loop control of position, speed and torque.  

  – Fully programmable for standalone operation

  – RS232 and USB communications as standard

  – Options for RS485, PROFIBUS and Ethernet

  – Digital and analogue input and output

  – Safe and efficient 24V DC operation

Compared with an equivalent size of stepper motor Cool Muscle works faster, with more available torque, it is more efficient and generates less heat.

Closed loop control means no step loss. In an open loop system it is possible for the motor to fail to move the exact number of steps if it is overloaded. Cool Muscle, being a closed loop control system, is able to identify any potential for step loss and to correct it. 

Link to download Intelligent Motors section of the catalogue

Intelligent Motors & Actuators

General Technical Information

The Reliance Cool Muscle is available with two types of control interface: Pulse Type (P) and Computer Type (C). The P-Type is applicable for a drive and stepper system with step-pulse control, such as a PLC. Cool Muscle provides an effective drop-in solution to resolve step loss problems and also provides a more integrated solution, having a combined stepper and drive. The C-Type offers a higher level of computer control in a single integrated unit which can remove the need for a separate controller or, in more complex systems, reduce the investment required in additional controllers.

Cool Muscle’s unique features include the ability to link up to 15 motors which can operate together in complex sequences without an additional controller. Cool Muscle is able to use a physical limit of travel as its reference position, using torque sensing to safely and accurately find the limits of travel without needing a position sensor (e.g. limit switch).

The high level of integration provided by Cool Muscle reduces cabling, keeps components to a minimum and speeds up system assembly.

Cool Muscle is ideal for laboratory and test equipment or for light industrial automation.

Power-managed and energy efficient, Cool Muscle always stays cool.

Reliance Cool Muscle Accessories


Control Room Software

Control Room is a free application which provides basic tools for setting parameters and creating motion profiles. A user friendly interface makes it easy to work with the Reliance Cool Muscle.

Download Software

Control Room replaces the CoolWorks software. 

CoolWorks continues to be supported by Reliance.

Communication Cards

RS485, PROFIBUS and Ethernet cards are available as options for the RCM servo systems. Our engineers provide technical support based on extensive experience integrating the Cool Muscle with third party controllers, HMIs, and PLCs.

Power supply

Designed specifically for the Reliance Cool Muscle, this power supply is built to withstand the current draw spikes which the hard stops or starts often require. Specification of the power supply is 150 W/300 W, 6 A/10 A

Communication Cables

A standard motor cable (40 cm) is supplied with every motor. Longer motor cables are available as an option.

A Y-cable is required to connect the RCM to a USB or serial port.

Multi motor custom cables can be made to suit your application.

Contact our sales team for more information.

Contact us for more information