초록 ▼

A high power low RPM direct current electric motor is disclosed whereby the high power output is achieved in one of two ways or both. In the first case, the need for cooling is reduced simultaneously along with an increase in the utilization of the magnetic field present in the motor permanent magne

A high power low RPM direct current electric motor is disclosed whereby the high power output is achieved in one of two ways or both. In the first case, the need for cooling is reduced simultaneously along with an increase in the utilization of the magnetic field present in the motor permanent magnets. This is achieved by wrapping the electromagnet core with windings that are capable of demagnetizing the rotor permanent magnets under stall conditions. Interlocking motor circuitry is provided which prevents the full activation of these motor windings until motor RPM values reach a safe level. This increases motor power while decreasing resistive losses in electromagnet windings. In the second case, the rotary portion consists of a large diameter relatively flat rotor containing permanent magnets and having built in vanes for moving air over the electromagnet stator windings providing forced air cooling.

대표청구항 ▼

[What is claimed is:] [1.]a stationary portion including a plurality of C-shaped electromagnets disposed to define an inner annular channel, each of said electromagnets having poles;a rotatable portion including:a shaft rotatable with respect to said stationary portion;at least one disc mounted to s

[What is claimed is:] [1.]a stationary portion including a plurality of C-shaped electromagnets disposed to define an inner annular channel, each of said electromagnets having poles;a rotatable portion including:a shaft rotatable with respect to said stationary portion;at least one disc mounted to said shaft, said disc having an annular portion rotatably disposed within said inner annular channel of said stationary portion; anda plurality of permanent magnets each having a direction of magnetization and poles, said plurality of permanent magnets disposed on said annular portion of said disc so that the direction of magnetization thereof is transverse through said disc and so that the poles thereof are aligned in coupling proximity to the poles of said electromagnets;position circuitry for sensing a position of said plurality of permanent magnets with respect to said plurality of said electromagnets and for providing a signal based on said position of said plurality of electromagnets to cause said rotatable portion to rotate;each of said plurality of electromagnets including a winding;said winding of at least one of said electromagnets having a configuration that demagnetizes said permanent magnets at stall conditions; andelectrical interlocking circuitry for allowing said configuration of said winding of said at least one of said electromagnets to be activated when said shaft reaches a preset speed that reduces current in said windings to a level sufficient to prevent demagnetization of said permanent magnets.