PULSED ELECTRIC MACHINE CONTROL WITH SOFT START AND END
An electric machine controller arranged to direct a power converter to cause a pulsed operation of an electric machine in selected operational ranges to deliver a desired output and to cause a continuous operation of the electric machine in selected operational ranges is provided. A ramp generator is adapted to provide a ramping between the pulsed operation and the continuous operation.
1 . An electric machine controller arranged to direct a power converter to cause a pulsed operation of an electric machine in selected operational ranges to deliver a desired output and to cause a continuous operation of the electric machine in selected operational ranges, wherein the electric machine controller comprises a ramp generator adapted to provide a ramping between the pulsed operation and the continuous operation.
2 . The electric machine controller, as recited in claim 1 , wherein the ramping is a ramping from the continuous operation to the pulsed operation and from the pulsed operation to the continuous operation.
3 . The electric machine controller, as recited in claim 1 , wherein the ramping is a ramping of at least one of magnitude, frequency, and period.
4 . The electric machine controller, as recited in claim 1 , wherein the ramping ramps both magnitude and frequency.
5 . The electric machine controller, as recited in claim 1 , wherein the ramp generator is adapted to reduce noise, vibration, and harshness when transitioning between pulsed operation and continuous operation.
6 . The electric machine controller, as recited in claim 1 , wherein the ramping is at least one of linear ramping, asymptotic function ramping, quadratic function ramping, and square root function ramping.
7 . The electric machine controller, as recited in claim 1 , wherein the ramping comprises providing at least two ramped pulses between continuous operation and pulsed operation.
8 . The electric machine controller, as recited in claim 1 , wherein the ramping is over a time duration of between 100 ms and 500 ms.
9 . A system comprising:
an electric machine;
a power converter; and
an electric machine controller arranged to direct a power converter to cause a pulsed operation of the electric machine in selected operational ranges to deliver a desired output and to cause a continuous operation of the electric machine in selected operational ranges, wherein the electric machine controller comprises a ramp generator adapted to provide a ramping between the pulsed operation and the continuous operation.
10 . The system, as recited in claim 9 , wherein the electric machine is a motor, and the power converter includes an inverter.
11 . The system, as recited in claim 9 , wherein the electric machine is a generator, and the power converter includes a rectifier.
12 . The system, as recited in claim 9 , wherein the electric machine is configured to operate as a motor/generator.
13 . The system, as recited in claim 9 , wherein the ramping is a ramping from the continuous operation to the pulsed operation and from the pulsed operation to the continuous operation.
14 . The system, as recited in claim 9 , wherein the ramping is a ramping of at least one of magnitude, frequency, and period.
15 . The system, as recited in claim 9 , wherein the ramping ramps both magnitude and frequency.
16 . The system, as recited in claim 9 , wherein the ramp generator is adapted to reduce noise, vibration, and harshness when transitioning between pulsed operation and continuous operation.
17 . The system, as recited in claim 9 , wherein the ramping is at least one of linear ramping, asymptotic function ramping, quadratic function ramping, and square root function ramping.
18 . The system, as recited in claim 9 , wherein the ramping comprises providing at least two ramped pulses between continuous operation and pulsed operation.
19 . The system, as recited in claim 9 , wherein the ramping is over a time duration of between 100 ms and 500 ms.
20 . A method for controlling an electric machine by an electric machine controller arranged to direct a power converter to cause a pulsed operation of the electric machine in selected operational ranges to deliver a desired output and to cause a continuous operation of the electric machine in selected operational ranges, comprising providing ramping between the pulsed operation and the continuous operation.
21 . The method, as recited in claim 20 , wherein the providing ramping provides a ramping from the continuous operation to the pulsed operation and from the pulsed operation to the continuous operation.
22 . The method, as recited in claim 20 , wherein the providing ramping provides a ramping of at least one of magnitude, frequency, and period.
23 . The method, as recited in claim 20 , wherein the providing the ramping ramps both magnitude and frequency.
24 . The method, as recited in claim 20 , wherein the providing the ramping is adapted to reduce noise, vibration, and harshness when transitioning between pulsed operation and continuous operation.
25 . The method, as recited in claim 20 , wherein the providing ramping provides at least one of linear ramping, asymptotic function ramping, quadratic function ramping, and square root function ramping.
26 . The method, as recited in claim 20 , wherein the providing the ramping comprises providing at least two ramped pulses between continuous operation and pulsed operation.
27 . The method, as recited in claim 20 , wherein the ramping is over a time duration of between 100 ms and 500 ms.