Brushless motor with torque and speed proportional coolant flow
First Claim
Patent Images
1. A brushless electric motor comprising:
- a fluid-tight housing;
an internally rotating rotor which is connected with an output shaft;
a stator core arranged at a radial distance from the rotor;
a coolant feeder leading into the interior of the housing;
a coolant outlet leading out of the housing; and
a control means for adjusting the volumetric flow of a coolant through the interior of the housing as a function of speed and torque, characterized in that in the range from 0% to approximately 30% of the continuous speed and in the range from approximately 60% to approximately 100% of the maximum torque of the electric motor the control means adjusts the ratio of between the volumetric flow of the coolant supplied through the coolant feeder and the volumetric flow of the coolant discharged through the coolant outlet so that the housing of the electric motor is completely filled with coolant, and in the range from 0% to approximately 100% of the continuous speed and in the range from approximately 0% to approximately 10% of the maximum torque of the electric motor the control means adjusts the ratio between the volumetric flow supplied through the coolant feeder and the volumetric flow of the coolant discharged through the coolant outlet so that no or only small quantities of coolant flow into the housing of the electric motor.
2 Assignments
0 Petitions
Accused Products
Abstract
A brushless electric motor has a fluid-tight housing, an internal rotor which is connected to an output shaft, stator plates which are disposed at a radial spacing from the rotor, a coolant delivery line leading into the interior of the housing, and a coolant discharge line leading out of the housing. A control arrangement, which as a function of the rotational speed and torque adjusts the volume flow of the coolant flowing through the interior of the housing, is provided to keep the efficiency of the arrangement as a whole high and to provide an electric motor having high power density.
-
Citations
21 Claims
-
1. A brushless electric motor comprising:
-
a fluid-tight housing; an internally rotating rotor which is connected with an output shaft; a stator core arranged at a radial distance from the rotor; a coolant feeder leading into the interior of the housing; a coolant outlet leading out of the housing; and a control means for adjusting the volumetric flow of a coolant through the interior of the housing as a function of speed and torque, characterized in that in the range from 0% to approximately 30% of the continuous speed and in the range from approximately 60% to approximately 100% of the maximum torque of the electric motor the control means adjusts the ratio of between the volumetric flow of the coolant supplied through the coolant feeder and the volumetric flow of the coolant discharged through the coolant outlet so that the housing of the electric motor is completely filled with coolant, and in the range from 0% to approximately 100% of the continuous speed and in the range from approximately 0% to approximately 10% of the maximum torque of the electric motor the control means adjusts the ratio between the volumetric flow supplied through the coolant feeder and the volumetric flow of the coolant discharged through the coolant outlet so that no or only small quantities of coolant flow into the housing of the electric motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification