Granted Patent B2

US 12,312,752 · App. 17/369,502 · Granted May 27, 2025

Inventors: Evan M. Glanzer (Milwaukee, WI); John E. Koller (Brookfield, WI)

Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION

E01C19/38E02D3/074H02K1/278H02K7/061H02K7/063H02K7/14

Abstract

Claims (27)

1. A compactor comprising:

a plate; and

an electric motor coupled to the plate and configured to impart vibration thereto, the electric motor including

a stator, and

a rotor including a rotor shaft and a rotor main body surrounding the rotor shaft, the rotor defining a rotational axis and having a center of mass that is not intersected by the rotational axis, wherein the rotor main body supports a plurality of permanent magnets, and wherein an eccentric mass is directly connected to the rotor main body,

wherein the rotor is positioned within the stator, and

wherein the plurality of permanent magnets is a plurality of surface-mounted permanent magnets.

2. The compactor of claim 1 , further comprising a battery configured to provide electrical power to the electric motor.

3. The compactor of claim 2 , wherein the battery is arranged on a platform that is vibrationally isolated from the plate by a plurality of vibration isolators.

4. The compactor of claim 3 , wherein the platform is configured as a housing, and wherein control electronics are located within the housing such that the control electronics are also vibrationally isolated from the plate by the vibration isolators.

5. The compactor of claim 1 , wherein the rotor includes a plurality of bores arranged in an annular formation about the rotational axis, and wherein at least one, but not all, of the bores are filled with respective weights to collectively define the eccentric mass offset from the rotational axis.

6. The compactor of claim 1 , wherein the rotor main body includes an axial plate, wherein the plurality of permanent magnets is coupled to a first side of the axial plate, and wherein the eccentric mass is coupled to an opposite, second side of the axial plate for co-rotation therewith about the rotational axis.

7. An electric motor configured for use with a compactor, the electric motor comprising:

a motor housing;

a stator disposed within the motor housing; and

a rotor arranged within the stator and configured for rotation relative to the stator about a rotational axis, the rotor including

a plurality of surface-mounted permanent magnets, and

a plurality of bores arranged in an annular formation about the rotational axis,

wherein at least one, but not all, of the bores are filled with respective weights to collectively define an eccentric mass offset from the rotational axis.

8. The electric motor of claim 7 , wherein the at least one weight is configured such that a center of mass of the rotor does not intersect a rotational axis of the rotor.

9. An electric motor configured for use with a plate compactor, the electric motor comprising:

a motor housing;

a stator;

a rotor configured for rotation relative to the stator about a rotational axis, the rotor including an axial plate and a plurality of permanent magnets; and

an eccentric mass coupled to the axial plate for co-rotation with the rotor about the rotational axis,

wherein the permanent magnets are affixed to a first side of the axial plate, and wherein the eccentric mass is coupled to an opposite, second side of the axial plate.

10. The electric motor of claim 9 , wherein the eccentric mass is offset from the rotational axis of the rotor.

Assignments (1)

Continuity (3)

References Cited (185)