Slotless, brushless PM motor is efficient
A 2002 EDITORS’ CHOICE AWARDS WINNER
|MOTORS, DRIVES & MOTION CONTROL|
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. 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.
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