A motor for a surgical instrument, the motor comprising: a rotor comprising a shaft and a magnet; and a stator comprising (i) a cavity in which the rotor is disposed, and (ii) a coil assembly, wherein the coil assembly comprises a plurality of phase sets, the plurality of phase sets comprise a plurality of sets of wires, each of the plurality of phase sets comprises a plurality of coils and corresponds to a respective one of the plurality of sets of wires, the coils in each of the plurality of phase sets are at respective positions about the rotor, one of the plurality of sets of wires comprises at least three wires, the plurality of sets of wires are fused together and compressed to provide a rigid structure of the coil assembly such that the stator is not supported by a support member extending within the coil assembly and does not include proximal, central and distally located support members, and the stator causes the rotor to axially rotate a surgical tool of the surgical instrument based on current received at the plurality of sets of wires; characterised in that the plurality of sets of wires are compressed a first time using a cable tie; and the plurality of sets of wires are compressed a second time using a protective layer and a press to provide the rigid structure such that the coil assembly is not supported by a support member extending within the coil assembly. a rotor comprising a shaft and a magnet; and a stator comprising (i) a cavity in which the rotor is disposed, and (ii) a coil assembly, wherein the coil assembly comprises a plurality of phase sets, the plurality of phase sets comprise a plurality of sets of wires, each of the plurality of phase sets comprises a plurality of coils and corresponds to a respective one of the plurality of sets of wires, the coils in each of the plurality of phase sets are at respective positions about the rotor, one of the plurality of sets of wires comprises at least three wires, the plurality of sets of wires are fused together and compressed to provide a rigid structure of the coil assembly such that the stator is not supported by a support member extending within the coil assembly and does not include proximal, central and distally located support members, and the stator causes the rotor to axially rotate a surgical tool of the surgical instrument based on current received at the plurality of sets of wires; characterised in that the plurality of sets of wires are compressed a first time using a cable tie; and the plurality of sets of wires are compressed a second time using a protective layer and a press to provide the rigid structure such that the coil assembly is not supported by a support member extending within the coil assembly. the coil assembly comprises a plurality of phase sets, the plurality of phase sets comprise a plurality of sets of wires, each of the plurality of phase sets comprises a plurality of coils and corresponds to a respective one of the plurality of sets of wires, the coils in each of the plurality of phase sets are at respective positions about the rotor, one of the plurality of sets of wires comprises at least three wires, the plurality of sets of wires are fused together and compressed to provide a rigid structure of the coil assembly such that the stator is not supported by a support member extending within the coil assembly and does not include proximal, central and distally located support members, and the stator causes the rotor to axially rotate a surgical tool of the surgical instrument based on current received at the plurality of sets of wires; characterised in that the plurality of sets of wires are compressed a first time using a cable tie; and the plurality of sets of wires are compressed a second time using a protective layer and a press to provide the rigid structure such that the coil assembly is not supported by a support member extending within the coil assembly.