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Designing a Servo Motor

Motors and generators with MotorSolve

The sizing feature of MotorSolve can be used to obtain an initial design of a motor model at the onset on the motor design process. It is an automated feature which uses as input, the target performance specifications and design constraints of the motor, and outputs a complete design including model dimensions and winding details including winding layout, phase coil details and end turn electrical parameters.

The output of the sizing feature gives a good initial model, considering the target performance characteristics. Typically, a design cycle of design refinements, iterations, PWM simulations can then be carried out using MotorSolve to obtain the final design.

Flux density of the servo motor

METHODS and RESULTS

DESIGN SPECIFICATIONS

The task is to design a servo motor with the following specifications: speed: 3500 RPM, Torque: 2 Nm, efficiency > 85%, DC link Voltage: dual 150/300 V, Frame size: 80 mm., Rotor type: surface mounted bread-loaf (interior), 8 pole/12 slot machine. The sizing interface, along with these input are shown in the attached figure.

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WINDING LAYOUT

The sizing feature outputs a complete model including model dimensions, winding layout, phase coil parameters and end winding parameters.

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SERVO MOTOR PERFORMANCE

The torque waveform, back emf, torque-speed characteristics and cogging torque of the output are presented in this section.

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BACK EMF of the SERVO MOTOR

The back emf of the motor is shown here.

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TORQUE-SPEED CURVE

The torque-speed characteristics are shown next.

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COGGING TOQUE

Finally, the cogging torque of the motor is presented.

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