Allen Bennett
General Manager
Intelligent Motion Systems Inc
Oceanside, Calif

Prime-ratio hybrid stepmotors like these look and work exactly like the conventional hybrid versions. But the design of their stator-pole laminations improves motor efficiency while reducing noise and vibration.

Prime-ratio hybrid stepmotors like these look and work exactly like the conventional hybrid versions. But the design of their stator-pole laminations improves motor efficiency while reducing noise and vibration.


Conventional stator laminations in hybrid stepmotors have five teeth per pole face. On the other hand, prime-ratio laminations have six teeth per pole face. As both prime and nonprime poles use the same 7.5° spacing between teeth, the prime-ratio pole is slightly larger than the nonprime version. As a result the open gap between the poles shrinks. The greater quantity of iron in the pole faces helps concentrate the stator magnetic field in the air gap between stator and rotor producing smoother operation with improved efficiency.

Conventional stator laminations in hybrid stepmotors have five teeth per pole face. On the other hand, prime-ratio laminations have six teeth per pole face. As both prime and nonprime poles use the same 7.5° spacing between teeth, the prime-ratio pole is slightly larger than the nonprime version. As a result the open gap between the poles shrinks. The greater quantity of iron in the pole faces helps concentrate the stator magnetic field in the air gap between stator and rotor producing smoother operation with improved efficiency.


Most engineers are familiar with hybrid stepmotors. But inside the apparently simple mechanism rests a complex combination of laminations, coils, and magnets. Hybrid stepmotors combine the controllability of the variable reluctance motor with the higher torque of the permanent magnet or "canstack" motor.

While low cost is the most no-table feature of hybrid designs, better motor performance and efficiency are also important. New construction techniques now let motor designers use prime-ratio laminations that improve efficiency, lower audible noise, and reduce operating temperatures over standard hybrid stepmotors. The laminations also boost torque output without using expensive electronics.

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