Construction of power assisting synchronous motor
View Patent ↗An improved synchronous electric motor incorporating a stator and large current terminal unit made into a single unit with solidified molding resin thus a separate casing is unnecessary and thus the constitution is simplified. The large current terminal unit and a magnetic pole position detector are located on opposite sides of the stator, with the former mounted on one end of the shaft of a cooperating rotor and with the other on the other end of the rotor shaft, and they are fixed in solidified molding resin to form a single body.
1. A high power synchronous electric motor comprised of a rotor having a rotor shaft carrying a plurality of circumferentially spaced permanent magnets, a stator encircling said rotor and comprised of a plurality of poles around which coil windings are formed, a high capacity terminal circuit positioned at one axial end of said poles in circuit with said coil windings, a magnet detector positioned at the other axial end of said poles and cooperating with said permanent magnets for determining the rotational position of said rotor, and a resinous body encasing said poles, said windings, and said high capacity terminal circuit to form a single unit and end closures carrying bearings for journaling opposite ends of said rotor shaft directly and detachably fixed to said resinous body.
2. A high power synchronous electric motor as set forth in claim 1 , wherein the end closures are affixed to the resinous body by threaded fasteners threaded into inserts retained in said resinous body.
3. A high power synchronous electric motor as set forth in claim 1 , wherein the magnet detector includes a sensor element fixed to the other end of the resinous body.
4. A high power synchronous electric motor as set forth in claim 3 , wherein the sensor element of the magnet detector is carried by the end closure at the respective end of the rotor shaft.
5. A high power synchronous electric motor as set forth in claim 4 , wherein the end closures are affixed to the resinous body by threaded fasteners threaded into inserts retained in said resinous body.
6. A high power synchronous electric motor as set forth in claim 5 , further including an end cap affixed to the resinous body and enclosing the end closure carrying the sensor element of the magnet detector.
7. A high power synchronous electric motor as set forth in claim 1 , wherein the high capacity terminal circuit is comprised of a plurality of ring shaped sheets surrounding the rotor shaft each having connections to a plurality of the coil windings and being axially spaced from each other and imbedded in an insulating material.
8. A high power synchronous electric motor as set forth in claim 7 , herein the insulating material is embedded in the resinous body.
9. A high power synchronous electric motor as set forth in claim 8 , wherein each of the ring shaped sheets has at least one axially extending terminal penetrating through the insulating material to accommodate an external electrical connection.