Ironless core motors feature low inductance that must be considered when specifying a drive system.  Inductance is necessary for proper operation of PWM amplifiers where switching currents can create leading edge spikes.  Some amplifiers have short circuit protection, which requires drive inductance to separate the drive current rise time from a true short circuit.  Sample inductor boards are available from ThinGap, which can be connected in series with motor phase leads.

Trapezoidal waveform PWM drives are commonplace in the controller marketplace and works well with ThinGap motors.  18kHz PWM frequency or higher is recommended. Refer to the manufacturers specifications for minimum inductance requirements.

Sinusoidal waveform PWM drives perform very well with ThinGap motors because the ThinGap back EMF waveform is almost purely sinusoidal.  Coupling a sinusoidal drive to a sinusoidal back EMF motor, such as ThinGap, results in very low torque ripple.  (See Torque Ripple Brief in the technology section). 

Feedback Control options for amplifiers vary from a Hall effect sensors for simple velocity control to servo control systems that utilize rotary or linear encoder feedback.

The specified voltage for TG2300 motors is a guideline for the input DC voltage to the amplifier.  Some drives have 120VAC input voltage that is rectified resulting in a DCV input of 170V.  PWM drives operating at 170VDC input are not recommended for use with ThinGap TG2300 motors.

AMC - ADVANCED MOTION CONTROLS	COPLEY CONTROLS
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ELMO MOTION CONTROL	AUTOMATION MODULES INC
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