Despite some declarations that electric motors have become 'commodity
items,' new motor innovations continue to reach the market via novel hardware
refinements and new software tools. For instance, TG3600 Series slotless, brushless PM motors from ThinGap Motor Technologies (Ventura,
CA) incorporate new winding technology that promises to eliminate eddy
current and hysteresis losses, and obtain high power efficiency over a
wide speed range.
High-power density comes from the thin-walled stator, allowing use
of both a very thin air gap and high-energy neodymium-iron-boron
magnets. Low-speed cogging is reportedly eliminated due to the absence
of magnetic hysteresis. The patented armature coil assembly and
thin-wall stator coil design uses precision machined copper sheets,
rather than circular wire. It eliminates the bulky iron core found
in standard motors.
TG3600 offers 115 oz-in.
max continuous torque at 2,400 rpm, with 24 V dc and 15.6 A servo
amplifier input. An unusually high thermal rating allows these motors
to operate up to 160 °C temperature.
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The technology is applicable
to brush dc, as well as brushless dc motors. In the brush dc, permanent-magnet,
slotless motor version, TG3300 delivers 80 oz-in. maximum continuous
torque at 10,000 rpm with 24 V dc and 27.5 A input. Weighing under
34 oz., approximately 1 kg, the motor is rated at 0.8 hp or 0.6
kW.
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- New winding
technology eliminates eddy current and hysteresis losses,
and obtains high power efficiency
- Achieves 115
oz-in. max continuous torque at 2,400 rpm with 24 V dc and
15.6 A servo amplifier input
- Unusually high
thermal rating of up to 160 °C temperature
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