Motor and motor manufacturing apparatus

Abstract

Flat rolled magnetic steel sheets and strip or a die is turned in the press forming process. Rotor cores are stacked with turning through an angle which is an odd number multiple of about (360°/(number of slots in the motor×natural number n×2)) and stator cores are stacked with turning through an angle which is an odd number multiple of (360°/(number of poles in the motor×natural number n×2)). Stacking with turning through an angle which is an odd number multiple converts the phases of cogging torques into mutually opposite phases and cancels and reduces the cogging torque caused by magnetic anisotropy.

1 . A motor manufacturing apparatus for manufacturing a motor equipped with a stacked core, wherein 
 the core is formed by using flat rolled magnetic steel sheets and strip which have crystal orientations that differ by an angle of any of the below-described clauses (1) through (5) or by half of this angle:    (1) an angle 1 which is an odd number multiple of about (360°/(number of poles in the motor×natural number n×2)), and/or an angle 2 which is an odd number multiple of about (360°/(number of slots in the motor×natural number n×2));    (2) an angle 1 obtained when the value of said natural number n is selected such that the (number of poles in the motor×natural number n) giving the angle 1 in said clause (1) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the value of said natural number n is selected such that the (number of slots in the motor×natural number n) giving the angle 2 in said clause (1) becomes equal to the number of poles in the motor or close thereto;    (3) an angle 1 such that the difference between angles which are odd number multiples of (360°/(number of poles in the motor×natural number [n1, n2, . . . ]×2)), for no less than two natural numbers (n1, n2, . . . ), is within a prescribed angle range; and/or an angle 2 such that the difference between angles which are odd number multiples of (360°/(number of slots in the motor×natural number [m1, m2, . . . ]×2)), for no less than two natural numbers (m1, m2, . . . ), is within a prescribed angle range.    (4) an angle 1 obtained when the values of said natural numbers n1 and n2 are selected such that the (number of poles in the motor×natural numbers [n1, n2]) giving the angle 1 in said clause (3) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the values of said natural numbers m1 and m2 are selected such that the (number of slots in the motor×natural number [m1, m2]) giving the angle 2 in said clause (3) becomes equal to the number of poles in the motor or close thereto.    (5) an angle 1′ obtained by subtracting the angle 2 and an angle 3 provided by other means from the angle 1, and/or an angle 2′ obtained by subtracting the angle 1 and an angle 3 provided by other means from the angle 2 in each of said clauses (1) through (4).    
   
   
       2 . A motor manufacturing apparatus for manufacturing a motor equipped with a stacked core, wherein 
 the core is formed by using flat rolled magnetic steel sheets and strip which have crystal orientations that differ by half an angle of any of the below-described clauses (1) through (5) and one core is turned over with respect to the other core and stacked therewith so that the angular difference therebetween becomes equal to said angle:    (1) an angle 1 which is an odd number multiple of about (360°/(number of poles in the motor×natural number n×2)), and/or an angle 2 which is an odd number multiple of about (360°/(number of slots in the motor×natural number n×2));    (2) an angle 1 obtained when the value of said natural number n is selected such that the (number of poles in the motor×natural number n) giving the angle 1 in said clause (1) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the value of said natural number n is selected such that the (number of slots in the motor×natural number n) giving the angle 2 in said clause (1) becomes equal to the number of poles in the motor or close thereto;    (3) an angle 1 such that the difference between angles which are odd number multiples of (360°/(number of poles in the motor×natural number [n1, n2, . . . ]×2)), for no less than two natural numbers (n1, n2, . . . ), is within a prescribed angle range; and/or an angle 2 such that the difference between angles which are odd number multiples of (360°/(number of slots in the motor×natural number [m1, m2, . . . ]×2)), for no less than two natural numbers (m1, m2, . . . ), is within a prescribed angle range.    (4) an angle 1 obtained when the values of said natural numbers n1 and n2 are selected such that the (number of poles in the motor×natural numbers [n1, n2]) giving the angle 1 in said clause (3) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the values of said natural numbers m1 and m2 are selected such that the (number of slots in the motor×natural number [m1, m2]) giving the angle 2 in said clause (3) becomes equal to the number of poles in the motor or close thereto.    (5) an angle 1′ obtained by subtracting the angle 2 and an angle 3 provided by other means from the angle 1, and/or an angle 2′ obtained by subtracting the angle 1 and an angle 3 provided by other means from the angle 2 in each of said clauses (1) through (4).    
   
   
       3 . A motor manufacturing apparatus for manufacturing a motor equipped with a stacked core, wherein 
 the core is formed by using flat rolled magnetic steel sheets and strip which have crystal orientations that differ by angles obtained by proportionally dividing an angle range of one period by the number of stacked pieces, where an angle of any of the below-described clauses (1) through (5) or half of this angle is the angle range of one period, or by angles obtained by adding the angle obtained by shifting by an angle which is an integer multiple of said one period angle to those proportionally divided angles:    (1) an angle 1 which is a natural number multiple of about (360°/(number of poles in the motor×natural number n)), and/or an angle 2 which is a natural number multiple of about (360°/(number of slots in the motor×natural number n));    (2) an angle 1 obtained when the value of said natural number n is selected such that the (number of poles in the motor×natural number n) giving the angle 1 in said clause (1) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the value of said natural number n is selected such that the (number of slots in the motor×natural number n) giving the angle 2 in said clause (1) becomes equal to the number of poles in the motor or close thereto;    (3) an angle 1 such that the difference between angles which are natural number multiples of (360°/(number of poles in the motor×natural number [n1, n2, . . . ])), for no less than two natural numbers (n1, n2, . . . ), is within a prescribed angle range; and/or an angle 2 such that the difference between angles which are natural number multiples of (360°/(number of slots in the motor×natural number [m1, m2, . . . ])), for no less than two natural numbers (m1, m2, . . . ), is within a prescribed angle range.    (4) an angle 1 obtained when the values of said natural numbers n1 and n2 are selected such that the (number of poles in the motor×natural numbers [n1, n2]) giving the angle 1 in said clause (3) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the values of said natural numbers m1 and m2 are selected such that the (number of slots in the motor×natural number [m1, m2]) giving the angle 2 in said clause (3) becomes equal to the number of poles in the motor or close thereto.    (5) an angle 1′ obtained by subtracting the angle 2 and an angle 3 provided by other means from the angle 1, and/or an angle 2′ obtained by subtracting the angle 1 and an angle 3 provided by other means from the angle 2 in each of said clauses (1) through (4).    
   
   
       4 . A motor manufacturing apparatus for manufacturing a motor equipped with a stacked core, wherein 
 the core is formed by using flat rolled magnetic steel sheets and strip which have crystal orientations that differ by angles obtained by proportionally dividing an angle range of one period by the number of stacked pieces, where half of the angle of any of the below-described clauses (1) through (5) is the angle range of one period, or by angles obtained by adding the angle obtained by shifting by an angle which is an integer multiple of said one period angle to those proportionally divided angles, and one core is turned over with respect to the other core and stacked therewith so that the angular difference therebetween becomes equal to said angle:    (1) an angle 1 which is a natural number multiple of about (360°/(number of poles in the motor×natural number n)), and/or an angle 2 which is a natural number multiple of about (360°/(number of slots in the motor×natural number n));    (2) an angle 1 obtained when the value of said natural number n is selected such that the (number of poles in the motor×natural number n) giving the angle 1 in said clause (1) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the value of said natural number n is selected such that the (number of slots in the motor×natural number n) giving the angle 2 in said clause (1) becomes equal to the number of poles in the motor or close thereto;    (3) an angle 1 such that the difference between angles which are natural number multiples of (360°/(number of poles in the motor×natural number [n1, n2, . . . ])), for no less than two natural numbers (n1, n2, . . . ), is within a prescribed angle range; and/or an angle 2 such that the difference between angles which are natural number multiples of (360°/(number of slots in the motor×natural number [m1, m2, . . . ])), for no less than two natural numbers (m1, m2, . . . ), is within a prescribed angle range.    (4) an angle 1 obtained when the values of said natural numbers n1 and n2 are selected such that the (number of poles in the motor×natural numbers [n1, n2]) giving the angle 1 in said clause (3) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the values of said natural numbers m1 and m2 are selected such that the (number of slots in the motor×natural number [m1, m2]) giving the angle 2 in said clause (3) becomes equal to the number of poles in the motor or close thereto.    (5) an angle 1′ obtained by subtracting the angle 2 and an angle 3 provided by other means from the angle 1, and/or an angle 2′ obtained by subtracting the angle 1 and an angle 3 provided by other means from the angle 2 in each of said clauses (1) through (4).    
   
   
       5 . A motor manufacturing apparatus for manufacturing a motor equipped with a stacked core, wherein 
 the core is formed by turning flat rolled magnetic steel sheets and strip or a die through an angle of any of the below-described clauses (1) through (5) or half of this angle:    (1) an angle 1 which is an odd number multiple of about (360°/(number of poles in the motor×natural number n×2)), and/or an angle 2 which is an odd number multiple of about (360°/(number of slots in the motor×natural number n×2));    (2) an angle 1 obtained when the value of said natural number n is selected such that the (number of poles in the motor×natural number n) giving the angle 1 in said clause (1) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the value of said natural number n is selected such that the (number of slots in the motor×natural number n) giving the angle 2 in said clause (1) becomes equal to the number of poles in the motor or close thereto;    (3) an angle 1 such that the difference between angles which are odd number multiples of (360°/(number of poles in the motor×natural number [n1, n2, . . . ]×2)), for no less than two natural numbers (n1, n2, . . . ), is within a prescribed angle range; and/or an angle 2 such that the difference between angles which are odd number multiples of (360°/(number of slots in the motor×natural number [m1, m2, . . . ]×2)), for no less than two natural numbers (m1, m2, . . . ), is within a prescribed angle range.    (4) an angle 1 obtained when the values of said natural numbers n1 and n2 are selected such that the (number of poles in the motor×natural numbers [n1, n2]) giving the angle 1 in said clause (3) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the values of said natural numbers m1 and m2 are selected such that the (number of slots in the motor×natural number [m1, m2]) giving the angle 2 in said clause (3) becomes equal to the number of poles in the motor or close thereto.    (5) an angle 1′ obtained by subtracting the angle 2 and an angle 3 provided by other means from the angle 1, and/or an angle 2′ obtained by subtracting the angle 1 and an angle 3 provided by other means from the angle 2 in each of said clauses (1) through (4).    
   
   
       6 . A motor manufacturing apparatus for manufacturing a motor equipped with a stacked core, wherein 
 the core is formed by turning flat rolled magnetic steel sheets and strip or a die through angles obtained by proportionally dividing an angle range of one period by the number of stacked pieces, where an angle of any of the below-described clauses (1) through (5) or half of this angle is the angle range of one period, or through angles obtained by adding the angle obtained by shifting by an angle which is an integer multiple of said one period angle to those proportionally divided angles:    (1) an angle 1 which is a natural number multiple of about (360°/(number of poles in the motor×natural number n)), and/or an angle 2 which is a natural number multiple of about (360°/(number of slots in the motor×natural number n));    (2) an angle 1 obtained when the value of said natural number n is selected such that the (number of poles in the motor×natural number n) giving the angle 1 in said clause (1) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the value of said natural number n is selected such that the (number of slots in the motor×natural number n) giving the angle 2 in said clause (1) becomes equal to the number of poles in the motor or close thereto;    (3) an angle 1 such that the difference between angles which are natural number multiples of (360°/(number of poles in the motor×natural number [n1, n2, . . . ])), for no less than two natural numbers (n1, n2, . . . ), is within a prescribed angle range; and/or an angle 2 such that the difference between angles which are natural number multiples of (360°/(number of slots in the motor×natural number [m1, m2, . . . ])), for no less than two natural numbers (m1, m2, . . . ), is within a prescribed angle range.    (4) an angle 1 obtained when the values of said natural numbers n1 and n2 are selected such that the (number of poles in the motor×natural numbers [n1, n2]) giving the angle 1 in said clause (3) becomes equal to the number of slots in the motor or close thereto, and/or an angle 2 obtained when the values of said natural numbers m1 and m2 are selected such that the (number of slots in the motor×natural number [m1, m2]) giving the angle 2 in said clause (3) becomes equal to the number of poles in the motor or close thereto.    (5) an angle 1′ obtained by subtracting the angle 2 and an angle 3 provided by other means from the angle 1, and/or an angle 2′ obtained by subtracting the angle 1 and an angle 3 provided by other means from the angle 2 in each of said clauses (1) through (4).