Electric motor having asymmetric configuration for generating unbalanced force

A haptic assembly configured to deliver a haptic signal, the haptic assembly comprising:

• an electric motor having a rotor with a stack of laminations positioned axially relative to one another;
• a stator having a plurality of magnets, the stator being divided into a first section and a second section;
• wherein the stator is configured to have an asymmetric magnetic field distribution such that the first section is characterized by a first magnetic field intensity and the second section is characterized by a second magnetic field intensity, the first magnetic field intensity being different from the second magnetic field intensity;
• wherein each of the plurality of magnets has a same strength;
• wherein a respective total volume of the plurality of magnets in the first section is different from the second section;
• wherein the stack of laminations includes a first rotor lamination divided into a first portion and a second portion;
• wherein the first rotor lamination includes a central hub and a plurality of teeth extending radially outwards from the central hub;
• wherein the first rotor lamination is configured to have an asymmetric mass distribution such that the first portion has a first mass and the second portion has a second mass, the first mass being different from the second mass;
• and
• wherein the electric motor is configured to selectively generate an unbalanced force.

An electric motor comprising:

• a rotor having a stack of laminations positioned axially relative to one another;
• a stator having a plurality of magnets, the stator being divided into a first section and a second section;
• wherein the stator is configured to have an asymmetric magnetic field distribution such that the first section is characterized by a first magnetic field intensity and the second section is characterized by a second magnetic field intensity, the first magnetic field intensity being different from the second magnetic field intensity;
• wherein each of the plurality of magnets has a same strength;
• wherein a respective total volume of the plurality of magnets in the first section is different from the second section;
• wherein the stack of laminations includes a first rotor lamination divided into a first portion and a second portion;
• wherein the first rotor lamination includes a central hub and a plurality of teeth extending radially outwards from the central hub;
• wherein the first rotor lamination is configured to have an asymmetric mass distribution such that the first portion has a first mass and the second portion has a second mass, the first mass being different from the second mass;
• and
• wherein the first rotor lamination is configured to selectively generate an unbalanced force.